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Wednesday, October 4, 2023

Mecca

From Wikipedia, the free encyclopedia
Mecca
مكة
  • The Holy Capital (العاصمة المقدسة)
  • Mother of all Settlements (أم القرى)
Makkah al-Mukarramah (مكة المكرمة)
Masjid al-Haram (Great Mosque of Mecca)
 
Neighborhood of Mina
 
Mecca is located in Saudi Arabia
Mecca
Mecca
CountrySaudi Arabia
ProvinceMecca Province
GovernorateHoly Capital Governorate
Government
 • MayorSaleh Al-Turki
 • Provincial GovernorKhalid bin Faisal Al Saud
Area
 • Total1,200 km2 (500 sq mi)
 • Land760 km2 (290 sq mi)
Elevation
277 m (909 ft)
Population
 (2015)
 • Total1,578,722
 • Estimate 
(2020)
2,042,000
 • Rank3rd in Saudi Arabia
DemonymMakki (مكي)
Time zoneUTC+3 (AST)
Area code+966-12
Websitehmm.gov.sa

Mecca (/ˈmɛkə/; officially Makkah al-Mukarramah, commonly shortened to Makkah) is the capital of Mecca Province in the Hejaz region of western Saudi Arabia and the holiest city in Islam. It is 70 km (43 mi) inland from Jeddah on the Red Sea, in a narrow valley 277 m (909 ft) above sea level. Its last recorded population was 1,578,722 in 2015. Its estimated metropolitan population in 2020 is 2.042 million, making it the third-most populated city in Saudi Arabia after Riyadh and Jeddah. Pilgrims more than triple this number every year during the Ḥajj pilgrimage, observed in the twelfth Hijri month of Dhūl-Ḥijjah.

Mecca is generally considered "the fountainhead and cradle of Islam". Mecca is revered in Islam as the birthplace of the Islamic prophet Muhammad. The Hira cave atop the Jabal al-Nur ("Mountain of Light"), just outside the city, is where Muslims believe the Quran was first revealed to Muhammad. Visiting Mecca for the Ḥajj is an obligation upon all able Muslims. The Great Mosque of Mecca, known as the Masjid al-Haram, is home to the Ka'bah, believed by Muslims to have been built by Abraham and Ishmael. It is one of Islam's holiest sites and the direction of prayer for all Muslims (qibla).

Muslim rulers from in and around the region long tried to take the city and keep it in their control, and thus, much like most of the Hejaz region, the city has seen several regime changes. The city was most recently conquered in the Saudi conquest of Hejaz by Ibn Saud and his allies in 1925. Since then, Mecca has seen a tremendous expansion in size and infrastructure, with newer, modern buildings such as the Abraj Al Bait, the world's fourth-tallest building and third-largest by floor area, towering over the Great Mosque. The Saudi government has also carried out the destruction of several historical structures and archaeological sites, such as the Ajyad Fortress. Non-Muslims are strictly prohibited from entering the city.

Under the Saudi government, Mecca is governed by the Mecca Regional Municipality, a municipal council of 14 locally elected members headed by the mayor (called Amin in Arabic) appointed by the Saudi government. In 2015, the mayor of the city was Osama bin Fadhel Al-Barr; as of January 2022, the mayor is Saleh Al-Turki. The City of Mecca amanah, which constitutes Mecca and the surrounding region, is the capital of the Mecca Province, which includes the neighbouring cities of Jeddah and Ta'if, even though Jeddah is considerably larger in population compared to Mecca. The Provincial Governor of the province from 16 May 2007 was Prince Khalid bin Faisal Al Saud.

Etymology

Mecca has been referred to by many names. As with many Arabic words, its etymology is obscure. Widely believed to be a synonym for Makkah, it is said to be more specifically the early name for the valley located therein, while Muslim scholars generally use it to refer to the sacred area of the city that immediately surrounds and includes the Ka'bah.

Bakkah

The Quran refers to the city as Bakkah in Surah Al Imran (3), verse 96: "Indeed the first House [of worship], established for mankind was that at Bakkah". This is said to have been the name of the city at the time of Abraham (Ibrahim in Islamic tradition) and it is also transliterated as Baca, Baka, Bakah, Bakka, Becca and Bekka, among others. It was a name for the city in the ancient world.

Makkah, Makkah al-Mukarramah and Mecca

Makkah is the official transliteration used by the Saudi government and is closer to the Arabic pronunciation. The government adopted Makkah as the official spelling in the 1980s, but it is not universally known or used worldwide. The full official name is Makkah al-Mukarramah (Arabic: مكة المكرمة, lit.'Makkah the Honored'). Makkah is used to refer to the city in the Quran in Surah Al-Fath (48), verse 24.

The word Mecca in English has come to be used to refer to any place that draws large numbers of people, and because of this some English-speaking Muslims have come to regard the use of this spelling for the city as offensive. Nonetheless, Mecca is the familiar form of the English transliteration for the Arabic name of the city.

The consensus in academic scholarship has been that "Macoraba", the place mentioned in Arabia Felix by Claudius Ptolemy, is Mecca. Some studies have questioned this association. Many etymologies have been proposed: the traditional one is that it is derived from the Old South Arabian root M-K-R-B which means "temple".

Other names

Another name used for Mecca in the Quran is at 6:92 where it is called Umm al-Qurā (أُمّ ٱلْقُرَى, meaning "Mother of all Settlements"). The city has been called several other names in both the Quran and ahadith. Another name used historically for Mecca is Tihāmah. According to Arab and Islamic tradition, another name for Mecca, Fārān, is synonymous with the Desert of Paran mentioned in the Old Testament at Genesis 21:21. Arab and Islamic tradition holds that the wilderness of Paran, broadly speaking, is the Tihamah coastal plain and the site where Ishmael settled was Mecca. Yaqut al-Hamawi, the 12th-century Syrian geographer, wrote that Fārān was "an arabized Hebrew word, one of the names of Mecca mentioned in the Torah."

Another ancient name for the city was Macoraba.

History

Prehistory

In 2010, Mecca and the surrounding area became an important site for paleontology with respect to primate evolution, with the discovery of a Saadanius fossil. Saadanius is considered to be a primate closely related to the common ancestor of the Old World monkeys and apes. The fossil habitat, near what is now the Red Sea in western Saudi Arabia, was a damp forest area between 28 million and 29 million years ago. Paleontologists involved in the research hope to find further fossils in the area.

Early history (up to 6th century CE)

The early history of Mecca is still largely disputed, as there are no unambiguous references to it in ancient literature prior to the rise of Islam. The first unambiguous reference to Mecca in external literature occurs in 741 CE, in the Byzantine-Arab Chronicle, though here the author places the region in Mesopotamia rather than the Hejaz.

The Greek historian Diodorus Siculus writes about Arabia in the 1st century BCE in his work Bibliotheca historica, describing a holy shrine: "And a temple has been set up there, which is very holy and exceedingly revered by all Arabians". Claims have been made this could be a reference to the Ka'bah in Mecca. However, the geographic location Diodorus describes is located in northwest Arabia, around the area of Leuke Kome, within the former Nabataean Kingdom and the Roman province of Arabia Petraea.

Ptolemy lists the names of 50 cities in Arabia, one going by the name of Macoraba. There has been speculation since 1646 that this could be a reference to Mecca. Historically, there has been a general consensus in scholarship that Macoraba mentioned by Ptolemy in the 2nd century CE is indeed Mecca, but more recently, this has been questioned. Bowersock favors the identity of the former, with his theory being that "Macoraba" is the word "Makkah" followed by the aggrandizing Aramaic adjective rabb (great). The Roman historian Ammianus Marcellinus also enumerated many cities of Western Arabia, most of which can be identified. According to Bowersock, he did mention Mecca as "Geapolis" or "Hierapolis", the latter one meaning "holy city" potentially referring to the sanctuary of the Kaaba. Patricia Crone, from the Revisionist school of Islamic studies on the other hand, writes that "the plain truth is that the name Macoraba has nothing to do with that of Mecca [...] if Ptolemy mentions Mecca at all, he calls it Moka, a town in Arabia Petraea". Recent research suggests that "Mecca was small" and the population of Mecca at the time of Muhammad was around 550.

Procopius' 6th century statement that the Ma'ad tribe possessed the coast of western Arabia between the Ghassanids and the Himyarites of the south supports the Arabic sources tradition that associates Quraysh as a branch of the Ma'add and Muhammad as a direct descendant of Ma'ad ibn Adnan.

Historian Patricia Crone has cast doubt on the claim that Mecca was a major historical trading outpost. However, other scholars such as Glen W. Bowersock disagree and assert that Mecca was a major trading outpost. Crone later on disregarded some of her theories. She argues that Meccan trade relied on skins, hides, manufactured leather goods, clarified butter, Hijazi woollens, and camels. She suggests that most of these goods were destined for the Roman army, which is known to have required colossal quantities of leather and hides for its equipment.

Mecca is mentioned in the following early Quranic manuscripts:

  • Codex Is. 1615 I, folio 47v, radiocarbon dated to 591–643 CE.
  • Codex Ṣanʿāʾ DAM 01–29.1, folio 29a, radiocarbon dated between 633 and 665 CE.
  • Codex Arabe 331, folio 40 v, radiocarbon dated between 652 and 765 CE.

The earliest Muslim inscriptions are from the Mecca-Ta'if area.

Islamic narrative

Mecca mentioned in Quranic manuscript Codex Arabe 331 (Q48:24)
 
A 1787 Ottoman Turkish map of Al-Haram Mosque, and related religious sites, such as Jabal al-Nour

In the Islamic view, the beginnings of Mecca are attributed to the Biblical figures, Abraham, Hagar and Ishmael. The civilization of Mecca is believed to have started after Ibrāhīm (Abraham) left his son Ismāʿīl (Ishmael) and wife Hājar (Hagar) in the valley at Allah's command. Some people from the Yemeni tribe of Jurhum settled with them, and Isma'il reportedly married two women, one after divorcing the first, on Ibrahim's advice. At least one man of the Jurhum helped Ismāʿīl and his father to construct or according to Islamic narratives, reconstruct, the Ka'bah ('Cube'), which would have social, religious, political and historical implications for the site and region.

Muslims see the mention of a pilgrimage at the Valley of Baca in the Old Testament chapter Psalm 84:3–6 as a reference to Mecca, similar to the Quran at Surah 3:96 In the Sharḥ al-Asāṭīr, a commentary on the Samaritan midrashic chronology of the Patriarchs, of unknown date but probably composed in the 10th century CE, it is claimed that Mecca was built by the sons of Nebaioth, the eldest son of Ismāʿīl or Ishmael.

Thamudic inscriptions

Some Thamudic inscriptions which were discovered in the south Jordan contained names of some individuals such as ʿAbd Mekkat (عَبْد مَكَّة, "Servant of Mecca").

There were also some other inscriptions which contained personal names such as Makki (مَكِّي, "Makkahn"), but Jawwad Ali from the University of Baghdad suggested that there's also a probability of a tribe named "Makkah".

Under the Quraish

Sometime in the 5th century, the Ka'bah was a place of worship for the deities of Arabia's pagan tribes. Mecca's most important pagan deity was Hubal, which had been placed there by the ruling Quraish tribe. and remained until the Conquest of Mecca by Muhammad. In the 5th century, the Quraish took control of Mecca, and became skilled merchants and traders. In the 6th century, they joined the lucrative spice trade, since battles elsewhere were diverting trade routes from dangerous sea routes to more secure overland routes. The Byzantine Empire had previously controlled the Red Sea, but piracy had been increasing. Another previous route that ran through the Persian Gulf via the Tigris and Euphrates rivers was also being threatened by exploitations from the Sassanid Empire, and was being disrupted by the Lakhmids, the Ghassanids, and the Roman–Persian Wars. Mecca's prominence as a trading center also surpassed the cities of Petra and Palmyra. The Sassanids however did not always pose a threat to Mecca, as in 575 CE they protected it from a Yemeni invasion, led by its Christian leader Abraha. The tribes of southern Arabia asked the Persian king Khosrau I for aid, in response to which he came south to Arabia with foot-soldiers and a fleet of ships near Mecca.

By the middle of the 6th century, there were three major settlements in northern Arabia, all along the south-western coast that borders the Red Sea, in a habitable region between the sea and the Hejaz mountains to the east. Although the area around Mecca was completely barren, it was the wealthiest of the three settlements with abundant water from the renowned Zamzam Well and a position at the crossroads of major caravan routes.

The harsh conditions and terrain of the Arabian peninsula meant a near-constant state of conflict between the local tribes, but once a year they would declare a truce and converge upon Mecca in an annual pilgrimage. Up to the 7th century, this journey was intended for religious reasons by the pagan Arabs to pay homage to their shrine, and to drink Zamzam. However, it was also the time each year that disputes would be arbitrated, debts would be resolved, and trading would occur at Meccan fairs. These annual events gave the tribes a sense of common identity and made Mecca an important focus for the peninsula.

The Year of the Elephant (570 CE)

The "Year of the Elephant" is the name in Islamic history for the year approximately equating to 570–572 CE, when, according to Islamic sources such as Ibn Ishaq, Abraha descended upon Mecca, riding an elephant, with a large army after building a cathedral at San'aa, named al-Qullays in honor of the Negus of Axum. It gained widespread fame, even gaining attention from the Byzantine Empire. Abraha attempted to divert the pilgrimage of the Arabs from the Ka'bah to al-Qullays, effectively converting them to Christianity. According to Islamic tradition, this was the year of Muhammad's birth. Abraha allegedly sent a messenger named Muhammad ibn Khuza'i to Mecca and Tihamah with a message that al-Qullays was both much better than other houses of worship and purer, having not been defiled by the housing of idols. When Muhammad ibn Khuza'i got as far as the land of Kinana, the people of the lowland, knowing what he had come for, sent a man of Hudhayl called ʿUrwa bin Hayyad al-Milasi, who shot him with an arrow, killing him. His brother Qays who was with him, fled to Abraha and told him the news, which increased his rage and fury and he swore to raid the Kinana tribe and destroy the Ka'bah. Ibn Ishaq further states that one of the men of the Quraysh tribe was angered by this, and going to Sana'a, entering the church at night and defiling it; widely assumed to have done so by defecating in it.

Abraha marched upon the Ka'bah with a large army, which included one or more war elephants, intending to demolish it. When news of the advance of his army came, the Arab tribes of Quraysh, Kinanah, Khuza'a and Hudhayl united in the defense of the Ka'bah and the city. A man from the Himyarite Kingdom was sent by Abraha to advise them that Abraha only wished to demolish the Ka'bah and if they resisted, they would be crushed. Abdul Muttalib told the Meccans to seek refuge in the hills while he and some members of the Quraysh remained within the precincts of the Kaaba. Abraha sent a dispatch inviting Abdul-Muttalib to meet with Abraha and discuss matters. When Abdul-Muttalib left the meeting he was heard saying: "The Owner of this House is its Defender, and I am sure he will save it from the attack of the adversaries and will not dishonor the servants of His House."

Abraha eventually attacked Mecca. However, the lead elephant, known as Mahmud, is said to have stopped at the boundary around Mecca and refused to enter. It has been theorized that an epidemic such as by smallpox could have caused such a failed invasion of Mecca. The reference to the story in Quran is rather short. According to the 105th Surah of the Quran, Al-Fil, the next day, a dark cloud of small birds sent by Allah appeared. The birds carried small rocks in their beaks, and bombarded the Ethiopian forces, and smashed them to a state like that of eaten straw.

Economy

Camel caravans, said to have first been used by Muhammad's great-grandfather, were a major part of Mecca's bustling economy. Alliances were struck between the merchants in Mecca and the local nomadic tribes, who would bring goods – leather, livestock, and metals mined in the local mountains – to Mecca to be loaded on the caravans and carried to cities in Shaam and Iraq. Historical accounts also provide some indication that goods from other continents may also have flowed through Mecca. Goods from Africa and the Far East passed through en route to Syria including spices, leather, medicine, cloth, and slaves; in return Mecca received money, weapons, cereals and wine, which in turn were distributed throughout Arabia. The Meccans signed treaties with both the Byzantines and the Bedouins, and negotiated safe passages for caravans, giving them water and pasture rights. Mecca became the center of a loose confederation of client tribes, which included those of the Banu Tamim. Other regional powers such as the Abyssinians, Ghassanids, and Lakhmids were in decline leaving Meccan trade to be the primary binding force in Arabia in the late 6th century.

Muhammad and the conquest of Mecca

Makkah Al Mukarramah Library (21°25′30″N 39°49′48″E) is believed to stand on the spot where Muhammad was born, so it is also known as Bayt al-Mawlid

Muhammad was born in Mecca in 570 CE, and thus Islam has been inextricably linked with it ever since. He was born into the faction of Banu Hashim in the ruling tribe of Quraysh. It was in the nearby mountain cave of Hira on Jabal al-Nour that Muhammad began receiving divine revelations from God through the archangel Jibreel in 610 CE, according to Islamic tradition. Advocating his form of Abrahamic monotheism against Meccan paganism, and after enduring persecution from the pagan tribes for 13 years, Muhammad emigrated to Medina (hijrah) in 622 CE with his companions, the Muhajirun, to Yathrib (later renamed Medina). The conflict between the Quraysh and the Muslims is accepted to have begun at this point. Overall, Meccan efforts to annihilate Islam failed and proved to be costly and unsuccessful. During the Battle of the Trench in 627 CE, the combined armies of Arabia were unable to defeat Muhammad's forces (as the trench surrounding Muhammad's forces protected them from harm and a storm was sent to breach the Quraysh tribe). In 628 CE, Muhammad and his followers wanted to enter Mecca for pilgrimage, but were blocked by the Quraysh. Subsequently, Muslims and Meccans entered into the Treaty of Hudaybiyyah, whereby the Quraysh and their allies promised to cease fighting Muslims and their allies and promised that Muslims would be allowed into the city to perform the pilgrimage the following year. It was meant to be a ceasefire for 10 years; however, just two years later, the Banu Bakr, allies of the Quraish, violated the truce by slaughtering a group of the Banu Khuza'ah, allies of the Muslims. Muhammad and his companions, now 10,000 strong, marched into Mecca and conquered the city. The pagan imagery was destroyed by Muhammad's followers and the location Islamized and rededicated to the worship of Allah alone. Mecca was declared the holiest site in Islam ordaining it as the center of Muslim pilgrimage (Hajj), one of the Islamic faith's Five Pillars.

Muhammad then returned to Medina, after assigning 'Akib ibn Usaid as governor of the city. His other activities in Arabia led to the unification of the Arabian Peninsula under the banner of Islam. Muhammad passed away in 632 CE. Within the next few hundred years, the area under the banner of Islam stretched from North Africa into Asia and parts of Europe. As the Islamic realm grew, Mecca continued to attract pilgrims from all across the Muslim world and beyond, as Muslims came to perform the annual Hajj pilgrimage. Mecca also attracted a year-round population of scholars, pious Muslims who wished to live close to the Kaaba, and local inhabitants who served the pilgrims. Due to the difficulty and expense of the Hajj, pilgrims arrived by boat at Jeddah, and came overland, or joined the annual caravans from Syria or Iraq.

Medieval and pre-modern times

Mecca was never the capital of any of the Islamic states. Muslim rulers did contribute to its upkeep, such as during the reigns of 'Umar (r. 634–644 CE) and 'Uthman ibn Affan (r. 644–656 CE) when concerns of flooding caused the caliphs to bring in Christian engineers to build barrages in the low-lying quarters and construct dykes and embankments to protect the area around the Kaaba.

Muhammad's return to Medina shifted the focus away from Mecca and later even further away when 'Ali, the fourth caliph, took power and chose Kufa as his capital. The Umayyad Caliphate moved the capital to Damascus in Syria and the Abbasid Caliphate to Baghdad, in modern-day Iraq, which remained the center of the Islamic Empire for nearly 500 years. Mecca re-entered Islamic political history during the Second Fitna, when it was held by Abdullah ibn az-Zubayr and the Zubayrids. The city was twice besieged by the Umayyads in 683 CE and 692 CE, and for some time thereafter, the city figured little in politics, remaining a city of devotion and scholarship governed by various other factions. In 930 CE, Mecca was attacked and sacked by Qarmatians, a millenarian Shi'a Isma'ili Muslim sect led by Abū-Tāhir Al-Jannābī and centered in eastern Arabia. The Black Death pandemic hit Mecca in 1349 CE.

Ibn Battuta's description of Mecca

One of the most famous travelers to Mecca in the 14th century was a Moroccan scholar and traveler, Ibn Battuta. In his rihla (account), he provides a vast description of the city. Around the year 1327 CE or 729 AH, Ibn Battuta arrived at the holy city. Immediately, he says, it felt like a holy sanctuary, and thus he started the rites of the pilgrimage. He remained in Mecca for three years and left in 1330 CE. During his second year in the holy city, he says his caravan arrived "with a great quantity of alms for the support of those who were staying in Mecca and Medina". While in Mecca, prayers were made for (not to) the King of Iraq and also for Salaheddin al-Ayyubi, Sultan of Egypt and Syria at the Ka'bah. Battuta says the Ka'bah was large, but was destroyed and rebuilt smaller than the original and that it contained images of angels and prophets including Jesus (Isa in Islamic tradition), his mother Mary (Maryam in Islamic tradition), and many others. Battuta describes the Ka'bah as an important part of Mecca due to the fact that many people make the pilgrimage to it. Battuta describes the people of the city as being humble and kind, and also willing to give a part of everything they had to someone who had nothing. The inhabitants of Mecca and the village itself, he says, were very clean. There was also a sense of elegance to the village.

Under the Ottomans

Panorama of Mecca, 1845, from the Khalili Collection of Hajj and the Arts of Pilgrimage

In 1517, the then Sharif of Mecca, Barakat bin Muhammad, acknowledged the supremacy of the Ottoman Caliph but retained a great degree of local autonomy. In 1803 the city was captured by the First Saudi State, which held Mecca until 1813, destroying some of the historic tombs and domes in and around the city. The Ottomans assigned the task of bringing Mecca back under Ottoman control to their powerful Khedive (viceroy) and Wali of Egypt, Muhammad Ali Pasha. Muhammad Ali Pasha successfully returned Mecca to Ottoman control in 1813. In 1818, the Saud were defeated again but survived and founded the Second Saudi State that lasted until 1891 and led on to the present country of Saudi Arabia. In 1853, Sir Richard Francis Burton undertook the Muslim pilgrimage to Mecca and Medina disguised as a Muslim. Although Burton was certainly not the first non-Muslim European to make the Hajj (Ludovico di Varthema did this in 1503), his pilgrimage remains one of the most famous and documented of modern times. Mecca was regularly hit by cholera outbreaks. Between 1830 and 1930, cholera broke out among pilgrims at Mecca 27 times.

Modern history

Mecca in 1910

Hashemite Revolt and subsequent control by the Sharifate of Mecca

In World War I, the Ottoman Empire was at war with the Allies. It had successfully repulsed an attack on Istanbul in the Gallipoli campaign and on Baghdad in the Siege of Kut. The British intelligence agent T.E. Lawrence conspired with the Ottoman governor, Hussain bin Ali, the Sharif of Mecca to revolt against the Ottoman Empire and it was the first city captured by his forces in the 1916 Battle of Mecca. Sharif's revolt proved a turning point of the war on the eastern front. Hussein declared a new state, the Kingdom of Hejaz, declaring himself the Sharif of the state and Mecca his capital. News reports in November 1916 via contact in Cairo with returning Hajj pilgrims, stated that with the Ottoman Turkish authorities gone, the Hajj of 1916 was free of the previous massive extortion and monetary demands made by the Turks who were agents of the Ottoman government.

Saudi Arabian conquest and modern history

Following the 1924 Battle of Mecca, the Sharif of Mecca was overthrown by the Saud family, and Mecca was incorporated into Saudi Arabia. Under Saudi rule, much of the historic city has been demolished as a result of the Saudi government fearing these sites might become sites of association in worship besides Allah (shirk). The city has been expanded to include several towns previously considered to be separate from the holy city and now is just a few kilometers outside the main sites of the Hajj, Mina, Muzdalifah and Arafat. Mecca is not served by any airport, due to concerns about the city's safety. It is instead served by the King Abdulaziz International Airport in Jeddah (approx. 70 km away) internationally and the Ta'if Regional Airport (approx. 120 km away) for domestic flights.

The city today is at the junction of the two most important highways in all of the Saudi Arabian highway system, Highway 40, which connects the city to Jeddah in the west and the capital, Riyadh and Dammam in the east and Highway 15, which connects it to Medina, Tabuk and onward to Jordan in the north and Abha and Jizan in the south. The Ottomans had planned to extend their railway network to the holy city, but were forced to abandon this plan due to their entry into the First World War. This plan was later carried out by the Saudi government, which connected the two holy cities of Medina and Mecca with the modern Haramain high-speed railway system which runs at 300 km/h (190 mph) and connects the two cities via Jeddah, King Abdulaziz International Airport and King Abdullah Economic City near Rabigh within two hours.

The haram area of Mecca, in which the entry of non-Muslims is forbidden, is much larger than that of Medina.

1979 Grand Mosque seizure

On 20 November 1979, two hundred armed dissidents led by Juhayman al-Otaibi, seized the Grand Mosque, claiming the Saudi royal family no longer represented pure Islam and that the Masjid al-Haram and the Ka'bah, must be held by those of true faith. The rebels seized tens of thousands of pilgrims as hostages and barricaded themselves in the mosque. The siege lasted two weeks, and resulted in several hundred deaths and significant damage to the shrine, especially the Safa-Marwah gallery. A multinational force was finally able to retake the mosque from the dissidents. Since then, the Grand Mosque has been expanded several times, with many other expansions being undertaken in the present day.

Destruction of Islamic heritage sites

Mecca, as seen from Jabal al-Nour. Mecca Clock Tower is visible in the skyline.

Under Saudi rule, it has been estimated that since 1985, about 95% of Mecca's historic buildings, most over a thousand years old, have been demolished. It has been reported that there are now fewer than 20 structures remaining in Mecca that date back to the time of Muhammad. Some important buildings that have been destroyed include the house of Khadijah, the wife of Muhammad, the house of Abu Bakr, Muhammad's birthplace and the Ottoman-era Ajyad Fortress. The reason for much of the destruction of historic buildings has been for the construction of hotels, apartments, parking lots, and other infrastructure facilities for Hajj pilgrims.

Incidents during pilgrimage

Mecca has been the site of several incidents and failures of crowd control because of the large numbers of people who come to make the Hajj. For example, on 2 July 1990, a pilgrimage to Mecca ended in tragedy when the ventilation system failed in a crowded pedestrian tunnel and 1,426 people were either suffocated or trampled to death in a stampede. On 24 September 2015, 700 pilgrims were killed in a stampede at Mina during the stoning-the-Devil ritual at Jamarat.

Significance in Islam

The Hajj involves pilgrims visiting Al-Haram Mosque, but mainly camping and spending time in the plains of Mina and Arafah

Mecca holds an important place in Islam and is considered the holiest city in all branches of the religion. The city derives its importance from the role it plays in the Hajj and 'Umrah and for its status as the birthplace of the Prophet Muhammad.

Masjid al-Haram

The Masjid al-Haram is the site of two of the most important rites of both the Hajj and of the Umrah, the circumambulation around the Ka'bah (tawaf) and the walking between the two mounts of Safa and Marwa (sa'ee). The masjid is also the site of the Zamzam Well. According to Islamic tradition, a prayer in the masjid is equal to 100,000 prayers in any other masjid around the world.

Kaaba

There is a difference of opinion between Islamic scholars upon who first built the Ka'bah, some believe it was built by the angels while others believe it was built by Adam. Regardless, it was built several times before reaching its current state. The Ka'bah is also the common direction of prayer (qibla) for all Muslims. The surface surrounding the Ka'bah on which Muslims circumambulate it is known as the Mataf.

Hajr-e-Aswad (The Black Stone)

The Black Stone is a stone, considered by scientists to be a meteorite or of similar origin and believed by Muslims to be of divine origin. It is set in the eastern corner of the Ka’bah and it is Sunnah to touch and kiss the stone. The area around the stone is generally always crowded and guarded by policemen to ensure the pilgrims' safety. In Islamic tradition, the stone was sent down from Jannah (Paradise) and used to build the Ka'bah. It used to be a white stone (and was whiter than milk). Because of the worldly sins of man, it slowly changed color to black over the years after it was brought down to Earth.

Maqam Ibrahim

Maqam Ibrahim, Makkah

This is the stone that Ibrahim (Abraham) stood on to build the higher parts of the Ka'bah. It contains two footprints that are comparatively larger than average modern-day human feet. The stone is raised and housed in a golden hexagonal chamber beside the Ka'bah on the Mataf plate.

Safa and Marwa

Muslims believe that in the divine revelation to Muhammad, the Quran, Allah describes the mountains of Safa and Marwah as symbols of His divinity. Walking between the two mountains seven times, 4 times from Safa to Marwah and 3 times from Marwah interchangeably, is considered a mandatory pillar (rukn) of 'Umrah.

Panorama of the al-Masjid al-Haram, also known as the Grand Mosque of Mecca, during the Hajj pilgrimage

Hajj and 'Umrah

The Hajj pilgrimage, also called the greater pilgrimage, attracts millions of Muslims from all over the world and almost triples Mecca's population for one week in the twelfth and final Islamic month of Dhu al-Hijjah. In 2019, the Hajj attracted 2,489,406 pilgrims to the holy city. The 'Umrah, or the lesser pilgrimage, can be done at anytime during the year. Every adult, healthy Muslim who has the financial and physical capacity to travel to Mecca must perform the Hajj at least once in a lifetime. Umrah, the lesser pilgrimage, is not obligatory, but is recommended in the Quran. In addition to the Masjid al-Haram, pilgrims also must visit the nearby towns of Mina/Muna, Muzdalifah and Mount Arafat for various rituals that are part of the Hajj.

Jabal an-Nur

Jabal al-Nour, the mountain atop which is the Hira cave, where it is believed Muhammad received his first revelation.

This is a mountain believed by Muslims to have been the place where Muhammad spent his time away from the bustling city of Mecca in seclusion. The mountain is located on the eastern entrance of the city and is the highest point in the city at 642 meters (2,106 feet).

Hira'a Cave

Situated atop Jabal an-Nur, this is the cave where Muslims believe Muhammad received the first revelation from Allah through the archangel Gabriel (Jibril in Islamic tradition) at the age of 40.

Geography

Mecca as seen from the International Space Station. Haram is visible in the center while Mina is visible in the east.

Mecca is located in the Hejaz region, a 200 km (124 mi) wide strip of mountains separating the Nafud desert from the Red Sea. The city is situated in a valley with the same name around 70 km (44 mi) east of the port city of Jeddah. Mecca is one of the lowest cities in elevation in the Hejaz region, located at an elevation of 277 m (909 ft) above sea level at 21º23' north latitude and 39º51' east longitude. Mecca is divided into 34 districts.

The city centers on the al-Haram area, which contains the Masjid al-Haram. The area around the mosque is the old city and contains the most famous district of Mecca, Ajyad. The main street that runs to al-Haram is the Ibrahim al-Khalil Street, named after Ibrahim. Traditional, historical homes built of local rock, two to three stories long are still present within the city's central area, within view of modern hotels and shopping complexes. The total area of modern Mecca is over 1,200 km2 (460 sq mi).

Elevation

Mecca is at an elevation of 277 m (909 ft) above sea level, and approximately 70 km (44 mi) inland from the Red Sea. It is one of the lowest in the Hejaz region. Although some mountain peaks in Mecca reach 1,000m in height.

Topography

The city center lies in a corridor between mountains, which is often called the "Hollow of Mecca". The area contains the valley of al-Taneem, the valley of Bakkah and the valley of Abqar. This mountainous location has defined the contemporary expansion of the city.

Sources of water

The mouthpiece of the well of Zamzam

Due to Mecca's climatic conditions water scarcity has been an issue throughout its history. In pre-modern Mecca, the city used a few chief sources of water. Among them were local wells, such as the Zamzam Well, that produced generally brackish water. Finding a sustainable water source to supply Mecca's permanent population and the large number of annual pilgrims was an undertaking that began in the Abbasid era under the auspices of Zubayda, the wife of the caliph Harun ar-Rashid. She donated funds for the deepening of Zamzam Well and funded a massive construction project likely costing 1.75 Million gold dinars. The project encompassed the construction of an underground aqueduct from the Arabic: عين حنين, romanizedʿAyn Ḥunayn, lit.'Spring of Hunayn' and smaller water sources in the area to Mecca in addition to the construction of a waterworks on Mount Arafat called Arabic: عين زبيدة, romanizedʿAyn Zubayda, lit.'Spring of Zubayda' using a separate conduit to connect it to Mecca and the Masjid al-Haram. Over time however the system deteriorated and failed to fulfil its function. Thus in 1245 CE, 1361 CE, 1400 CE, 1474 CE, and 1510 CE different rulers invested into extensive repairs of the system. In 1525 CE due to the system's troubles persisting however the Ottoman sultan Suleiman the Magnificent began a construction project to rebuild the aqueduct in its entirety, the project took until 1571 CE to be completed. Its water quality was greatly lacking during the 19th century until a restoration and cleaning project by Osman Pasha began.

Another source which sporadically provided water was rainfall which was stored by the people in small reservoirs or cisterns. According to al-Kurdī, there had been 89 floods by 1965. In the last century, the most severe flood was that of 1942. Since then, dams have been built to ameliorate this problem.

In the modern day water treatment plants and desalination facilities have been constructed and are being constructed to provide suitable amounts of water fit for human consumption to the city.

Climate

Mecca features a hot desert climate (Köppen: BWh), in three different plant hardiness zones: 10, 11 and 12. Like most Saudi Arabian cities, Mecca retains warm to hot temperatures even in winter, which can range from 19 °C (66 °F) at night to 30 °C (86 °F) in the afternoon. Summer temperatures are extremely hot and consistently break the 40 °C (104 °F) mark in the afternoon, dropping to 30 °C (86 °F) in the evening, but humidity remains relatively low, at 30–40%. Rain usually falls in Mecca in small amounts scattered between November and January, with heavy thunderstorms also common during the winter.


Climate data for Mecca
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 37.4
(99.3)
38.3
(100.9)
42.4
(108.3)
44.7
(112.5)
49.4
(120.9)
49.6
(121.3)
49.8
(121.6)
49.7
(121.5)
49.4
(120.9)
47.0
(116.6)
41.2
(106.2)
38.4
(101.1)
49.8
(121.6)
Average high °C (°F) 30.5
(86.9)
31.7
(89.1)
34.9
(94.8)
38.7
(101.7)
42.0
(107.6)
43.8
(110.8)
43.0
(109.4)
42.8
(109.0)
42.8
(109.0)
40.1
(104.2)
35.2
(95.4)
32.0
(89.6)
38.1
(100.6)
Daily mean °C (°F) 24.6
(76.3)
25.4
(77.7)
28.0
(82.4)
31.6
(88.9)
34.3
(93.7)
35.8
(96.4)
35.9
(96.6)
35.7
(96.3)
35.0
(95.0)
33.0
(91.4)
29.1
(84.4)
25.6
(78.1)
30.8
(87.4)
Average low °C (°F) 18.8
(65.8)
19.1
(66.4)
21.1
(70.0)
24.5
(76.1)
27.6
(81.7)
28.6
(83.5)
29.1
(84.4)
29.5
(85.1)
28.9
(84.0)
25.9
(78.6)
23.0
(73.4)
20.3
(68.5)
24.7
(76.5)
Record low °C (°F) 11.0
(51.8)
10.0
(50.0)
13.0
(55.4)
15.6
(60.1)
20.3
(68.5)
22.0
(71.6)
23.4
(74.1)
23.4
(74.1)
22.0
(71.6)
18.0
(64.4)
16.4
(61.5)
12.4
(54.3)
10.0
(50.0)
Average precipitation mm (inches) 20.8
(0.82)
3.0
(0.12)
5.5
(0.22)
10.3
(0.41)
1.2
(0.05)
0.0
(0.0)
1.4
(0.06)
5.0
(0.20)
5.4
(0.21)
14.5
(0.57)
22.6
(0.89)
22.1
(0.87)
111.8
(4.40)
Average precipitation days 4.0 0.9 1.8 1.8 0.7 0.0 0.3 1.5 2.0 1.9 3.9 3.6 22.4
Average relative humidity (%) (daily average) 58 54 48 43 36 33 34 39 45 50 58 59 46
Mean monthly sunshine hours 260.4 245.8 282.1 282.0 303.8 321.0 313.1 297.6 282.0 300.7 264.0 248.0 3,400.5
Mean daily sunshine hours 8.4 8.7 9.1 9.4 9.8 10.7 10.1 9.6 9.4 9.7 8.8 8.0 9.3
Source 1: Jeddah Regional Climate Center
Source 2: Deutscher Wetterdienst (sunshine hours, 1986–2000)

Economy

Pilgrims are the driving force of Mecca's economy

The Meccan economy has been heavily dependent on pilgrimages coming for Umrah and Hajj. Income generated through pilgrims not only powers the Meccan economy but has historically had far-reaching effects on the economy of the entire Arabian Peninsula. The income was generated in a number of ways. One method was taxing the pilgrims. Taxes were especially increased during the Great Depression, and many of these taxes existed to as late as 1972. Another way the Hajj generates income is through services to pilgrims. For example, the Saudi flag carrier, Saudia, generates 12% of its income from the pilgrimage. Fares paid by pilgrims to reach Mecca by land also generate income; as do the hotels and lodging companies that house them. The city takes in more than $100 million, while the Saudi government spends about $50 million on services for the Hajj. There are some industries and factories in the city, but Mecca no longer plays a major role in Saudi Arabia's economy, which is mainly based on oil exports. The few industries operating in Mecca include textiles, furniture, and utensils. The majority of the economy is service-oriented.

Nevertheless, many industries have been set up in Mecca. Various types of enterprises that have existed since 1970 in the city include corrugated iron manufacturing, copper extraction, carpentry, upholstery, bakeries, farming and banking. The city has grown substantially in the 20th and 21st centuries, as the convenience and affordability of jet travel has increased the number of pilgrims participating in the Hajj. Thousands of Saudis are employed year-round to oversee the Hajj and staff the hotels and shops that cater to pilgrims; these workers in turn have increased the demand for housing and services. The city is now ringed by freeways, and contains shopping malls and skyscrapers.

Human resources

Formal education started to be developed in the late Ottoman period continuing slowly into Hashemite times. The first major attempt to improve the situation was made by a Jeddah merchant, Muhammad ʿAlī Zaynal Riḍā, who founded the Madrasat al-Falāḥ in Mecca in 1911–12 that cost £400,000. The school system in Mecca has many public and private schools for both males and females. As of 2005, there were 532 public and private schools for males and another 681 public and private schools for female students. The medium of instruction in both public and private schools is Arabic with emphasis on English as a second language, but some private schools founded by foreign entities such as International schools use the English language as the medium of instruction. Some of these are coeducational while other schools are not. For higher education, the city has only one university, Umm Al-Qura University, which was established in 1949 as a college and became a public university in 1981.

Healthcare is provided by the Saudi government free of charge to all pilgrims. There are ten main hospitals in Mecca:

  • Ajyad Hospital (مُسْتَشْفَى أَجْيَاد)
  • King Faisal Hospital (مُسْتَشْفَى ٱلْمَلِك فَيْصَل بِحَي ٱلشّشه)
  • King Abdulaziz Hospital (Arabic: مُسْتَشْفَى ٱلْمَلِك عَبْد ٱلْعَزِيْز بِحَي ٱلـزَّاهِر)
  • Al Noor Specialist Hospital (مُسْتَشْفَى ٱلنُّوْر ٱلتَّخَصُّصِي)
  • Hira'a Hospital (مُسْتَشْفَى حِرَاء)
  • Maternity and Children's Hospital (مُسْتَشْفَى ٱلْوِلَادَة وَٱلْأَطْفَال)
  • King Abdullah Medical City (مَدِيْنَة ٱلْمَلِك عَبْد ٱلله ٱلطِّبِيَّة)
  • Khulais General Hospital (مُسْتَشْفَى خُلَيْص ٱلْعَام)
  • Al Kamel General Hospital (مُسْتَشْفَى ٱلْكَامِل ٱلْعَام)
  • Ibn Sina Hospital (مُسْتَشْفَى ابْن سِيْنَا بِحَدَاء / بَحْرَه)

There are also many walk-in clinics available for both residents and pilgrims. Several temporary clinics are set up during the Hajj to tend to wounded pilgrims.

Culture

Al-Haram Mosque and the Kaaba

Mecca's culture has been affected by the large number of pilgrims that arrive annually, and thus boasts a rich cultural heritage. As a result of the vast numbers of pilgrims coming to the city each year, Mecca has become by far the most diverse city in the Muslim world.

Al Baik, a local fast-food chain, is very popular among pilgrims and locals alike. Until 2018, it was available only in Mecca, Medina and Jeddah, and traveling to Jeddah just to get a taste of the fried chicken was common.

Sports

In pre-modern Mecca, the most common sports were impromptu wrestling and foot races. Football is now the most popular sport in Mecca and the kingdom, and the city hosts some of the oldest sport clubs in Saudi Arabia such as Al Wahda FC (established in 1945). King Abdulaziz Stadium is the largest stadium in Mecca with a capacity of 38,000.

Demographics

Mecca is very densely populated. Most long-term residents live in the Old City, the area around the Great Mosque and many work to support pilgrims, known locally as the Hajj industry. 'Iyad Madani, the Saudi Arabian Minister for Hajj, was quoted saying, "We never stop preparing for the Hajj."

Year-round, pilgrims stream into the city to perform the rites of 'Umrah, and during the last weeks of eleventh Islamic month, Dhu al-Qi'dah, on average 2–4 million Muslims arrive in the city to take part in the rites known as Hajj. Pilgrims are from varying ethnicities and backgrounds, mainly South and Southeast Asia, Europe and Africa. Many of these pilgrims have remained and become residents of the city. The Burmese are an older, more established community who number roughly 250,000. Adding to this, the discovery of oil in the past 50 years has brought hundreds of thousands of working immigrants.

Non-Muslims are not permitted to enter Mecca under Saudi law, and using fraudulent documents to do so may result in arrest and prosecution. The prohibition extends to Ahmadis, as they are considered non-Muslims. Nevertheless, many non-Muslims and Ahmadis have visited the city as these restrictions are loosely enforced. The first such recorded example of a non-Muslim entering the city is that of Ludovico di Varthema of Bologna in 1503. Guru Nanak, the founder of Sikhism, is said to have visited Mecca in December 1518. One of the most famous was Richard Francis Burton, who traveled as a Qadiriyya Sufi from Afghanistan in 1853.

Mecca Province is the only province where expatriates outnumber Saudis.

Architectural landmarks

Adorning the southern facade of the Masjid al-Haram, the Abraj al-Bait Complex, which towers over the Great Mosque, is a seven-building complex with the central clock tower having a length of 601 m (1,972 feet), making it the world's fourth-tallest building. All seven buildings in the complex also form the third-largest building by floor area.

The Mecca Gate, known popularly as the Quran Gate, on the western entrance of the city, or from Jeddah. Located on Highway 40, it marks the boundary of the Haram area where non-Muslims are prohibited from entering. The gate was designed in 1979 by an Egyptian architect, Samir Elabd, for the architectural firm IDEA Center. The structure is that of a book, representing the Quran, sitting on a rehal, or bookrest.

Communications

Press and newspapers

The first press was brought to Mecca in 1885 by Osman Nuri Pasha, an Ottoman Wāli. During the Hashemite period, it was used to print the city's official gazette, Al Qibla. The Saudi regime expanded this press into a larger operation, introducing the new Saudi official gazette of Mecca, Umm al-Qurā. Mecca also has its own paper owned by the city, Al Nadwa. However, other Saudi newspapers are also provided in Mecca such as the Saudi Gazette, Al Madinah, Okaz and Al Bilad, in addition to other international newspapers.

TV

Telecommunications in the city were emphasized early under the Saudi reign. King Abdulaziz pressed them forward as he saw them as a means of convenience and better governance. While under Hussein bin Ali, there were about 20 public telephones in the entire city; in 1936, the number jumped to 450, totaling about half the telephones in the country. During that time, telephone lines were extended to Jeddah and Ta’if, but not to the capital, Riyadh. By 1985, Mecca, like other Saudi cities, possessed modern telephone, telex, radio and television communications. Many television stations serving the city area include Saudi TV1, Saudi TV2, Saudi TV Sports, Al-Ekhbariya, Arab Radio and Television Network and various cable, satellite and other specialty television providers.

Radio

Limited radio communication was established within the Kingdom under the Hashemites. In 1929, wireless stations were set up in various towns in the region, creating a network that would become fully functional by 1932. Soon after World War II, the existing network was greatly expanded and improved. Since then, radio communication has been used extensively in directing the pilgrimage and addressing the pilgrims. This practice started in 1950, with the initiation of broadcasts on the Day of 'Arafah (9 Dhu al-Hijjah), and increased until 1957, at which time Radio Makkah became the most powerful station in the Middle East at 50 kW. Later, power was increased 9-fold to 450 kW. Music was not immediately broadcast, but gradually folk music was introduced.

Transportation

Air

The only airport near the city is the Mecca East airport, which is not active. Mecca is primarily served by King Abdulaziz International Airport in Jeddah for international and regional connections and Ta'if Regional Airport for regional connections. To cater the large number of Hajj pilgrims, Jeddah Airport has Hajj Terminal, specifically for use in the Hajj season, which can accommodate 47 planes simultaneously and can receive 3,800 pilgrims per hour during the Hajj season.

Roads

3rd Ring Road passing through Kudai Area

Mecca, similar to Medina, lies at the junction of two of the most important highways in Saudi Arabia, Highway 40, connecting it to the important port city of Jeddah in the west and the capital of Riyadh and the other major port city, Dammam, in the east. The other, Highway 15, connects Mecca to the other holy Islamic city of Medina approximately 400 km (250 mi) in the north and onward to Tabuk and Jordan. While in the south, it connects Mecca to Abha and Jizan. Mecca is served by four ring roads, and these are very crowded compared to the three ring roads of Medina.

Mecca also has many tunnels.

Rapid transit

Al Masha'er Al Muqaddassah Metro

The Al Masha'er Al Muqaddassah Metro is a metro line in Mecca opened on 13 November 2010. The 18.1-kilometer (11.2-mile) elevated metro transports pilgrims to the holy sites of 'Arafat, Muzdalifah and Mina in the city to reduce congestion on the road and is only operational during the Hajj season. It consists of nine stations, three in each of the aforementioned towns.

Mecca Metro

The Mecca Metro, officially known as Makkah Mass Rail Transit, is a planned four-line metro system for the city. This will be in addition to the Al Masha'er Al Muqaddassah Metro which carries pilgrims.

Rail

Intercity

In 2018, a high speed intercity rail line, part of the Haramain High Speed Rail Project, named the Haramain high-speed railway line entered operation, connecting the holy cities of Mecca and Medina together via Jeddah, King Abdulaziz International Airport and King Abdullah Economic City in Rabigh. The railway consists of 35 electric trains and is capable of transporting 60 million passengers annually. Each train can achieve speeds of up to 300 kmh (190 mph), traveling a total distance of 450 km (280 mi), reducing the travel time between the two cities to less than two hours.

Geography of Greenland

From Wikipedia, the free encyclopedia
 
Greenland
Native name:
Kalaallit Nunaat
Grønland
Greenland
Outline map of Greenland with ice sheet depths. (Much of the area in green has permanent snow cover, but less than 10m (33ft) thick.)
Geography
LocationBetween the Arctic Ocean and the North Atlantic Ocean
Coordinates64°10′N 51°43′W
Area2,166,086 km2 (836,330 sq mi)
Area rank1st
Coastline44,087 km (27394.4 mi)
Highest elevation3,694 m (12119 ft)
Highest pointGunnbjørn
Administration
Province Greenland
Largest settlementNuuk (Godthåb) (pop. 17,984)
Demographics
Population56,732 (February 8, 2020)
Pop. density0.028/km2 (0.073/sq mi)
Ethnic groups

Greenland is located between the Arctic Ocean and the North Atlantic Ocean, northeast of Canada and northwest of Iceland. The territory comprises the island of Greenland—the largest island in the world—and more than a hundred other smaller islands (see alphabetic list). Greenland has a 1.2 kilometre (0.75 mi) long border with Canada on Hans Island. A sparse population is confined to small settlements along certain sectors of the coast. Greenland possesses the world's second-largest ice sheet.

Greenland sits atop the Greenland plate, a subplate of the North American plate. The Greenland craton is made up of some of the oldest rocks on the face of the earth. The Isua greenstone belt in southwestern Greenland contains the oldest known rocks on Earth, dated at 3.7–3.8 billion years old.

The vegetation is generally sparse, with the only patch of forested land being found in Nanortalik Municipality in the extreme south near Cape Farewell.

The climate is arctic to subarctic, with cool summers and cold winters. The terrain is mostly a flat but gradually sloping icecap that covers all land except for a narrow, mountainous, barren, rocky coast. The lowest elevation is sea level and the highest elevation is the summit of Gunnbjørn Fjeld, the highest point in the Arctic at 3,694 meters (12,119 ft). The northernmost point of the island of Greenland is Cape Morris Jesup, discovered by Admiral Robert Peary in 1900. Natural resources include zinc, lead, iron ore, coal, molybdenum, gold, platinum, uranium, hydropower and fish.

Area

Total area: 2,166,086 km2

Land area: 2,166,086 km2 (410,449 km2 ice-free, 1,755,637 km2 ice-covered)

Maritime claims:

Territorial sea: 3 nautical miles (5.6 km; 3.5 mi)

Exclusive fishing zone: 200 nautical miles (370.4 km; 230.2 mi)

Land use

Arable land: approximately 6%; some land is used to grow silage.
Permanent crops: Approximately 0%
Other: 100% (2012 est.)

The total population comprises around 56,000 inhabitants, of whom approximately 18,000 live in the capital, Nuuk.

Natural hazards

Continuous ice sheet covers 84% of the country; the rest is permafrost.

Environment – current issues

Protection of the Arctic environment, climate change, pollution of the food chain, excessive hunting of endangered species (walrus, polar bears, narwhal, beluga whale and several sea birds).

Climate

Greenland map of Köppen climate classification
Retreat of the Helheim Glacier, Greenland
Map of Greenland's rate of change in ice sheet height
Map of Greenland bedrock

Greenland's climate is a tundra climate on and near the coasts and an ice cap climate in inland areas. It typically has short, cool summers and long, moderately cold winters.

Due to Gulf Stream influences, Greenland's winter temperatures are very mild for its latitude. In Nuuk, the capital, average winter temperatures are only −9 °C (16 °F). In comparison, the average winter temperatures for Iqaluit, Nunavut, Canada, are around −27 °C (−17 °F). Conversely, summer temperatures are very low, with an average high around 10 °C (50 °F). This is too low to sustain trees, and the land is treeless tundra.

On the Greenland ice sheet, the temperature is far below freezing throughout the year, and record high temperatures have peaked only slightly above freezing. The record high temperature at Summit Camp is 2.2 °C (36.0 °F).

In the far south of Greenland, there is a very small forest in the Qinngua Valley, due to summer temperatures being barely high enough to sustain trees. There are mountains over 1,500 metres (4,900 ft) high surrounding the valley, which protect it from cold, fast winds travelling across the ice sheet. It is the only natural forest in Greenland, but is only 15 kilometres (9.3 mi) long.


Climate data for Nuuk
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 13.5
(56.3)
13.0
(55.4)
13.2
(55.8)
14.6
(58.3)
18.3
(64.9)
23.8
(74.8)
26.3
(79.3)
25.1
(77.2)
23.8
(74.8)
19.9
(67.8)
15.8
(60.4)
13.2
(55.8)
26.3
(79.3)
Average high °C (°F) −5.6
(21.9)
−6.3
(20.7)
−6.8
(19.8)
−1.4
(29.5)
3.4
(38.1)
7.7
(45.9)
10.2
(50.4)
10.4
(50.7)
6.3
(43.3)
1.8
(35.2)
−1.1
(30.0)
−3.4
(25.9)
1.3
(34.3)
Daily mean °C (°F) −8.2
(17.2)
−9.1
(15.6)
−9.2
(15.4)
−3.6
(25.5)
0.8
(33.4)
4.4
(39.9)
6.8
(44.2)
7.3
(45.1)
3.7
(38.7)
−0.3
(31.5)
−3.4
(25.9)
−5.8
(21.6)
−1.4
(29.5)
Average low °C (°F) −10.4
(13.3)
−11.5
(11.3)
−11.4
(11.5)
−5.7
(21.7)
−2.5
(27.5)
1.7
(35.1)
3.8
(38.8)
4.0
(39.2)
2.8
(37.0)
−2.1
(28.2)
−5.4
(22.3)
−8
(18)
−3.7
(25.3)
Record low °C (°F) −32.5
(−26.5)
−29.6
(−21.3)
−27.5
(−17.5)
−30.0
(−22.0)
−19.0
(−2.2)
−10.3
(13.5)
−6.6
(20.1)
−4.7
(23.5)
−8.2
(17.2)
−16.6
(2.1)
−24.4
(−11.9)
−25.2
(−13.4)
−32.5
(−26.5)
Average precipitation mm (inches) 54.7
(2.15)
51.1
(2.01)
49.1
(1.93)
45.6
(1.80)
56.5
(2.22)
60.6
(2.39)
81.3
(3.20)
89.1
(3.51)
90.2
(3.55)
66.5
(2.62)
75.2
(2.96)
62.0
(2.44)
781.6
(30.77)
Average precipitation days (≥ 0.1 mm) 13.8 12.7 15.1 13.2 13.0 10.5 12.5 12.5 14.1 13.5 14.3 14.4 159.6
Average snowy days 13.6 12.1 14.5 11.4 9.4 2.8 0.1 0.2 4.3 9.8 12.7 13.8 104.7
Average relative humidity (%) 78 79 81 81 84 84 87 87 83 78 76 77 81
Mean monthly sunshine hours 15.5 65.0 148.8 180.0 189.1 204.0 195.3 164.3 141.0 80.6 30.0 6.2 1,419.8
Mean daily sunshine hours 0.5 2.3 4.8 6.0 6.1 6.8 6.3 5.3 4.7 2.6 1.0 0.2 3.9
Source 1: Danish Meteorological Institute
Source 2: Meteo Climat (record highs and lows), Deutscher Wetterdienst (humidity 1961–1990, sun 1980–1990)

Climate change

The Greenland ice sheet is 3 kilometers (1.9 mi) thick and broad enough to blanket an area the size of Mexico. The ice is so massive that its weight presses the bedrock of Greenland below sea level and is so all-concealing that not until recently did scientists discover Greenland's Grand Canyon or the possibility that Greenland might actually be three islands.

If the ice melted, the interior bedrock below sea level would be covered by water. It is not clear whether this water would be at sea level or a lake above sea level. If it would be at sea level it could connect to the sea at Ilulissat Icefjord, in Baffin Bay and near Nordostrundingen, creating three large islands. But it is most likely that it would be a lake with one drain.

It is thought that before the last Ice Age, Greenland had mountainous edges and a lowland (and probably very dry) center which drained to the sea via one big river flowing out westwards, past where Disko Island is now.

There is concern about sea level rise caused by ice loss (melt and glaciers falling into the sea) on Greenland. Between 1997 and 2003 ice loss was 68–92 km3/a (16–22 cu mi/a), compared to about 60 km3/a (14 cu mi/a) for 1993/4-1998/9. Half of the increase was from higher summer melting, with the rest caused by the movements of some glaciers exceeding the speeds needed to balance upstream snow accumulation. A complete loss of ice on Greenland would cause a sea level rise of as much as 6.40 meters (21.0 ft).

Researchers at NASA's Jet Propulsion Laboratory and the University of Kansas reported in February 2006 that the glaciers are melting twice as fast as they were five years ago. By 2005, Greenland was beginning to lose more ice volume than anyone expected – an annual loss of up to 52 cubic miles or 217 cubic kilometres per year, according to more recent satellite gravity measurements released by JPL. The increased ice loss may be partially offset by increased snow accumulation due to increased precipitation.

Between 1991 and 2006, monitoring of the weather at one location (Swiss Camp) found that the average winter temperature had risen almost 10 °F (5.6 °C).

Recently, Greenland's three largest outlet glaciers have started moving faster, satellite data show. These are the Jakobshavn Isbræ at Ilulissat on the western edge of Greenland, and the Kangerdlugssuaq and Helheim glaciers on the eastern edge of Greenland. The two latter accelerated greatly during the years 2004–2005, but returned to pre-2004 velocities in 2006. The accelerating ice flow has been accompanied by a dramatic increase in seismic activity. In March 2006, researchers at Harvard University and the Lamont–Doherty Earth Observatory at Columbia University reported that the glaciers now generate swarms of earthquakes up to magnitude 5.0.

The retreat of Greenland's ice is revealing islands that were thought to be part of the mainland. In September 2005 Dennis Schmitt discovered an island 400 miles (644 km) north of the Arctic Circle in eastern Greenland which he named Uunartoq Qeqertaq, Inuit for "warming island".

Future projections

In the Arctic, temperatures are rising faster than anywhere else in the world. Greenland is losing 200 billion tonnes of ice per year. Research suggests that this could increase the sea levels' rise by 30 centimeters by the end of the century. These projections have the possibility of changing as satellite data only dates back to 40 years ago. This means that researchers must view old photographs of glaciers and compare them to ones taken today to determine the future of Greenland's ice.

Temperature extremes

Climate data for Greenland
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Record high °C (°F) 15.3
(59.5)
16.0
(60.8)
16.0
(60.8)
19.1
(66.4)
24.8
(76.6)
30.1
(86.2)
26.3
(79.3)
25.2
(77.4)
24.9
(76.8)
19.3
(66.7)
21.6
(70.9)
15.9
(60.6)
30.1
(86.2)
Record low °C (°F) −66.1
(−87.0)
−63.3
(−81.9)
−64.8
(−84.6)
−57.3
(−71.1)
−49.0
(−56.2)
−37.5
(−35.5)
−33.0
(−27.4)
−39.2
(−38.6)
−46.0
(−50.8)
−55.4
(−67.7)
−60.0
(−76.0)
−69.6
(−93.3)
−69.6
(−93.3)
Source 1: Weather Extremes Greenland, retrieved 28 July 2020 (all record lows except for Jan, Mar, May, Dec)(Jan and Feb record highs), Meteo Climat (Mar-Dec highs)
Source 2: Georgi, Johannes (1935), Eismitte record low, PANGAEA - Data Publisher for Earth & Environmental Science, doi:10.1594/PANGAEA.604003, retrieved 28 July 2020 (March record low),

May record low at Summit, retrieved 28 July 2020 (May record low), WUnderground, retrieved 28 July 2020 (record low all time)

Highest temperatures

Month Temperature Date Location
January 15.3 °C (59.5 °F) 29 January 2003 Nuuk, Sermersooq
February 16.0 °C (60.8 °F) 20 February 2005 Nanortailak, Kujalleq
March 16.0 °C (60.8 °F) 31 March 1975 Narsarsuaq, Kujalleq
April 19.1 °C (66.4 °F) 26 April 2016 Narsarsuaq, Kujalleq
May 24.8 °C (76.6 °F) 29 May 2012 Narsarsuaq, Kujalleq
June 30.1 °C (86.2 °F) 23 June 1915 Ivittuut, Sermersooq
July 26.3 °C (79.3 °F) 6 July 2008 Nuuk, Sermersooq
August 25.2 °C (77.4 °F) 3 August 1899 Tasillaq, Sermersooq
September 24.9 °C (76.8 °F) 2 September 2010 Nuuk, Sermersooq
October 19.3 °C (66.7 °F) 5 October 2016 Tasillaq, Sermersooq
November 21.6 °C (70.9 °F) 21 November 2015 Tasillaq, Sermersooq
December 15.9 °C (60.6 °F) 21 December 2001 Narsarsuaq, Kujalleq

Lowest temperatures

Month Temperature Date Location
January −66.1 °C (−87.0 °F) 9 January 1954 North Ice, Northeast Greenland
February −63.3 °C (−81.9 °F) 21 February 2002 Summit Camp Station, Northeast Greenland
March −64.8 °C (−84.6 °F) 20 March 1931 Eismitte, Northeast Greenland
April −57.3 °C (−71.1 °F) 21 April 2011 Summit Camp Station, Northeast Greenland
May −49.0 °C (−56.2 °F) 9 May 2018 Summit Camp Station, Northeast Greenland
June −37.5 °C (−35.5 °F) 1 June 2011 Summit Camp Station, Northeast Greenland
July −33.0 °C (−27.4 °F) 4 July 2017 Summit Camp Station, Northeast Greenland
August −39.2 °C (−38.6 °F) 29 August 2004 Summit Camp Station, Northeast Greenland
September −46.0 °C (−50.8 °F) 24 September 2009 Summit Camp Station, Northeast Greenland
October −55.4 °C (−67.7 °F) 26 October 2018 Summit Camp Station, Northeast Greenland
November −60.0 °C (−76.0 °F) 26 November 2001 Summit Camp Station, Northeast Greenland
December −69.6 °C (−93.3 °F) 22 December 1991 Klinck Station, Northeast Greenland

Topography

The ice sheet covering Greenland varies significantly in elevation across the landmass, rising dramatically between the coastline at sea level and the East-Central interior, where elevations reach 3,200 meters (10,500 ft). The coastlines are rocky and predominantly barren with fjords. Numerous small islands spread from the Central to Southern coastlines.

Greenland's mountain ranges are partially or completely buried by ice. The highest mountains are in the Watkins Range, which runs along the eastern coast. Greenland's highest mountain is Gunnbjorn Fjeld with a height of 3,700 meters (12,139 ft).

Scientists discovered an asteroid impact crater in the northwestern region of Greenland, buried underneath the ice sheet. At a size larger than Washington, D.C., it is the first impact crater found beneath one of Earth's ice sheets.

Extreme points

This is a list of the extreme points of Greenland, the points that are farther north, south, east or west than any other location.

Territory of Greenland

Mainland Greenland

Towns

Greenland has 17 towns – settlements with more than 500 inhabitants. Nuuk is the largest town – and the capital – with roughly one third of the country's urban population. Sisimiut with approximately 5,500 inhabitants is the second largest town, while Ilulissat is number three with around 5,000 inhabitants.

History of exploration

Ocean optics

From Wikipedia, the free encyclopedia
The properties of particles, such as this single particle of detritus, determine how they absorb and scatter light.

Ocean optics is the study of how light interacts with water and the materials in water. Although research often focuses on the sea, the field broadly includes rivers, lakes, inland waters, coastal waters, and large ocean basins. How light acts in water is critical to how ecosystems function underwater. Knowledge of ocean optics is needed in aquatic remote sensing research in order to understand what information can be extracted from the color of the water as it appears from satellite sensors in space. The color of the water as seen by satellites is known as ocean color. While ocean color is a key theme of ocean optics, optics is a broader term that also includes the development of underwater sensors using optical methods to study much more than just color, including ocean chemistry, particle size, imaging of microscopic plants and animals, and more.

Key terminology

Optically deep

Where waters are “optically deep,” the bottom does not reflect incoming sunlight, and the seafloor cannot be seen by humans or satellites. The vast majority of the world’s oceans by area are optically deep. Optically deep water can still be relatively shallow water in terms of total physical depth, as long as the water is very turbid, such as in estuaries.

MODIS-Aqua satellite image of the Black Sea captured on June 20, 2006. All the water that we can see at the scale of this image is optically deep, because the seafloor is not visible to the satellite sensor.
Many oceanographic buoys and weather buoys at sea are located in optically deep waters, like the one being recovered in this photo 60 nautical miles north of Oahu, Hawaii.

Optically shallow

Where waters are “optically shallow,” the bottom reflects light and often can be seen by humans and satellites. Here, ocean optics can also be used to study what is under the water. Based on what color they appear to sensors, researchers can map habitat types, including macroalgae, corals, seagrass beds, and more. Mapping shallow-water environments requires knowledge of ocean optics because the color of the water must be accounted for when looking at the color of the seabed environment below.

Where light reaches the bottom, the water is known as optically shallow, such as in this pool. The pattern of light on the bottom is caused by light refraction at the surface when ripples and small waves bend the water surface.
The water at many tropical beaches, such as this beach on the Kure Atoll, is optically shallow. Light reflects off white-colored sand, creating a turquoise color.

Inherent optical properties (IOPs)

Sentinel-2 satellite image of the confluence of the Rio Negro and the Solimões River in Brazil. The dark colored water of the Rio Negro is rich in dissolved substances (high absorption), while the brighter brown colored water of the Solimões River is rich in sediments (high scattering). The properties of these two water types can be studied with methods central to the field of ocean optics.

Inherent optical properties (IOPs) depend on what is in the water. These properties stay the same no matter what the incoming light is doing (daytime or nighttime, low sun angle or high sun angle).

Absorption

Water with large amounts of dissolved substances, such as lakes with large amounts of colored dissolved organic matter (CDOM), experience high light absorption. Phytoplankton and other particles also absorb light.

Scattering involves how light is bounced into many directions by objects such as very small particles in the ocean. Measuring light scattering involved measuring light coming from different angles.

Scattering

Areas with sea ice, estuaries with large amounts of suspended sediments, and lakes with large amounts of glacial flour are examples of water bodies with high light scattering. All particles scatter light to some extent, including plankton, minerals, and detritus. Particle size effects how much scattering happens at different colors; for example, very small particles scatter light exponentially more in the blue colors than other colors, which is why the ocean and the sky are generally blue (called Rayleigh scattering). Without scattering, light would not “go” anywhere (outside of a direct beam from the sun or other source) and we would not be able to see the world around us.

Attenuation

Attenuation in water, also called beam attenuation or the beam attenuation coefficient, is the sum of all absorption and scattering. Attenuation of a light beam in one specific direction can be measured with an instrument called a transmissometer.

Apparent optical properties (AOPs)

Apparent optical properties (AOPs) depend on what is in the water (IOPs) and what is going on with the incoming light from the sun. AOPs depend most strongly on IOPs and only depend somewhat on incoming light aka the “light field.” Characteristics of the light field that can affect AOP measurements include the angle at which light hits the water surface (high in the sky vs. low in the sky, and from which compass direction) and the weather and sky conditions (clouds, atmospheric haze, fog, or sea state aka roughness of the surface of the water).

Remote sensing reflectance (Rrs)

Remote sensing reflectance (Rrs) is a measure of light radiating out from beneath the ocean surface at all colors, normalized by incoming sunlight at all colors. Because Rrs is a ratio, it is slightly less sensitive to what is going on with the light field (such as the angle of the sun or atmospheric haziness).

Rrs is measured using two paired spectroradiometers that simultaneously measure light coming in from the sky and light coming up from the water below at many wavelengths. Since it is a measurement of a light-to-light ratio, the energy units cancel out, and Rrs has the units of per steradian (sr-1) due to the angular nature of the measurement (upwelling light is measured at a specific angle, and incoming light is measured on a flat plane from a half-hemispherical area above the water surface).

Light attenuation coefficient (Kd)

Kd is the diffuse (or downwelling) coefficient of light attenuation (Kd), also called simply light attenuation, the vertical extinction coefficient, or the extinction coefficient. Kd describes the rate of decrease of light with depth in water, in units of per meter (m−1). The “d” stands for downwelling light, which is light coming from above the sensor in a half-hemispherical shape (aka half of a basketball). Scientists sometimes use Kd to describe the decrease in the total visible light available for plants in terms of photosynthetically active radiation (PAR) – called “Kd(PAR).” In other cases, Kd can describe the decrease in light with depth over a spectrum of colors or wavelengths, usually written as “Kd(λ).” At one color (one wavelength) Kd can describe the decrease in light with depth of one color, such as the decrease in blue light at the wavelength 490 nm, written as “Kd(490).”

In general, Kd is calculated using Beer’s Law and a series of light measurements collected from just under the water surface down through the water at many depths.

A scientist measures Kd(PAR) from a boat in the Chesapeake Bay. This is a measure of downwelling light attenuation using a flat-topped light sensor (small brown metal cylinder at left), called a cosine collector, to measure the light coming down onto a flat surface from above.
Divers set up an equipment package including a sensor to measure PAR at the seafloor. This is a measure of scalar light using a round shaped light sensor (white lightbulb-like object at left), called a spherical quanta sensor, to measure light coming from all directions spherically.

Closure

“Closure” refers to how optical oceanographers measure the consistency of models and measurements. Models refer to anything that is not explicitly measured in the water, including satellite-derived variables that are estimated using empirical relationships (for example, satellite-derived chlorophyll-a concentration is estimated from the ratios between green and blue remote sensing reflectance using an empirical relationship). Closure includes measurement closure, model closure, model-data closure, and scale closure. Where model-data closure experiments show misalignment between data and models, the cause of the misalignment may be due to measurement error, issues with the model, both, or some other external factor.

Focus areas

Ocean optics has been applied to study topics like primary production, phytoplankton, zooplankton, shallow-water habitats like seagrass beds and coral reefs, marine biogeochemistry, heating of the upper ocean, and carbon export to deep waters by way of the ocean biological pump. The portion of the electromagnetic spectrum usually involved in ocean optics is ultraviolet through infrared, about 300 nm to less than 2000 nm wavelengths.

Common optical sensors used in oceanography

A conductivity-temperature-depth rosette (CTD-rosette) sampler instrument package ready for deployment. PAR sensors are often attached to the top circular rung of the equipment package. Optical sensors like fluorometers and transmissometers are often attached to the bottom section of the equipment package, below the Niskin bottles, on the same level as the CTD sensor (light green cylinder just visible at the bottom of this image).

The most widely used optical oceanographic sensors are PAR sensors, chlorophyll-a fluorescence sensors (fluorometers), and transmissometers. These three instruments are frequently mounted on CTD(conductivity-temperature-depth)-rosette samplers. These instruments have been used for many years on CTD-rosettes in global repeat oceanographic surveys like the CLIVAR GO-SHIP campaign.

Particle size in the ocean

Optical instruments are often used to measure the size spectrum of particles in the ocean. For example, phytoplankton organisms can range in size from a few microns (micrometers, µm) to hundreds of microns. The size of particles is often measured to estimate how quickly particles will sink, and therefore how efficiently plants can sequester carbon in the ocean’s biological pump.

Ocean optics studies dissolved and particulate substances in the water, spanning a wide range of sizes. Many of these things are very small in size, from less than 0.1 nm to organisms at the centimeter scale. A single human hair is ~100 microns in width, for reference.
Particle size in the ocean follows a logarithmic pattern with concentration: there are exponentially more small particles than large particles. This plot shows concentration (number of particles per volume of water) on the y axis vs. particle size on the x axis.

Imaging of ocean particles and organisms

Scientists study individual tiny objects such as plankton and detritus particles using flow cytometry and in situ camera systems. Flow cytometers measure sizes and take photographs of individual particles flowing through a tube system; one such instrument is the Imaging FlowCytoBot (IFCB). In situ camera systems are deployed over the side of a research vessel, alone or attached to other equipment, and they capture photographs of the water itself to image the particles present in the water; one such instrument is the Underwater Vision Profiler (UVP). Other imaging technologies used in the ocean include holography and particle imaging velocimetry (PIV), which uses 3D video footage to track the movement of underwater particles.

Researchers prepare an Imaging FlowCytoBot (IFCB) for water sampling.
Scientists stand next to an Imaging FlowCytoBot (IFCB).

Research in support of satellite remote sensing

Ocean color remote sensing involves learning about the ocean based on its color as viewed by satellite sensors. The light reaching the satellite sensor starts as incoming light from the sun, then gets scattered and absorbed by earth’s atmosphere and surface, including water on the surface. Accurate ocean color measurements depend on accurate measurements of the optical properties of the water.

Ocean optics research done “in situ” (from research vessels, small boats, or on docks and piers) supports research that uses satellite data. In situ optical measurements provide a way to: 1) calibrate satellite sensors when they are just beginning to collect data, 2) develop algorithms to derive products or variables like chlorophyll-a concentration, and 3) validate data products derived from satellites. Using satellite data, researchers estimate things like particle size, carbon, water quality, water clarity, and bottom type based on the color profile as seen by satellite; all of these estimations (aka models) must be validated by comparing them to optical measurements made in situ. In situ data are often available from publicly accessible data libraries like the SeaBASS data archive.

A researcher prepares a filtration rig aboard a research vessel. Some optical properties of water, like absorption by particles, are measured by filtering water and measuring the color signature of the material on the filter.
Visualization of satellite-derived global plant life, both oceanic (mg m−3 chlorophyll-a) and terrestrial (normalized difference land vegetation index), provided by the SeaWiFS Project, NASA Goddard Space Flight Center. The field of ocean optics includes methods that help researchers estimate ocean chlorophyll-a concentrations.
Schematic of processes that need to be measured to fully understand ocean productivity and carbon sequestration. Many of these topics involve optical measurements.

Major contributing scientists

Oceanographers, physicists, and other scientists who have made major contributions to the field of ocean optics include (incomplete list):

David Antoine, Marcel Babin, Paula Bontempi, Emmanuel Boss, Annick Bricaud, Kendall Carder, Ivona Cetinic, Edward Fry, Heidi Dierssen, David Doxaran, Gene Carl Feldman, Howard Gordon, Chuanmin Hu, Nils Gunnar Jerlov, George Kattawar, John Kirk, ZhongPing Lee, Hubert Loisel, Stephane Maritorena, Michael Mishchenko, Curtis Mobley, Bruce Monger, Andre Morel, Michael Morris, Norm Nelson, Mary Jane Perry , Rudolph Preisendorfer, Louis Prieur, Chandrasekhara Raman, Collin Roesler, Rüdiger Röttgers, David Siegel, Raymond Smith, Heidi Sosik, Dariusz Stramski, Michael Twardowski, Talbot Waterman, Jeremy Werdell, Ken Voss, Charles Yentsch, and Ronald Zaneveld.

Education

While ocean optics is an interdisciplinary field of study applies to a wide range of topics, it is not often taught as a course in graduate programs for marine science and oceanography. Two summer-term courses have been developed for graduate students from many different institutions. First, there is a summer lecture series operated by the International Ocean Colour Coordinating Group (IOCCG) which usually takes place in France. Second, there is an ongoing course in the United States called the “Optical Oceanography Class” or “Ocean Optics Class” in Washington State and later in Maine, which has been running continuously since 1985.

For independent learning, Curt Mobley, Collin Roesler, and Emmanuel Boss wrote the Ocean Optics Web Book as an open-access online guide.

Lie group

From Wikipedia, the free encyclopedia https://en.wikipedia.org/wiki/Lie_group In mathematics , a Lie gro...