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Wednesday, July 10, 2019

Federal government of the United States

From Wikipedia, the free encyclopedia
 
U.S. Federal Government
Great Seal of the United States (obverse).svg
Formation1789; 230 years ago
Founding documentUnited States Constitution
JurisdictionUnited States of America
Websitewww.usa.gov
Legislative branch
LegislatureCongress
Meeting placeCapitol
Executive branch
LeaderPresident
AppointerElectoral College
HeadquartersThe White House
Main organCabinet
Departments15
Judicial branch
CourtSupreme Court
SeatWashington, D.C.

The federal government of the United States (U.S. federal government) is the national government of the United States, a federal republic in North America, composed of 50 states, a federal district, five major self-governing territories, and several island possessions. The federal government is composed of three distinct branches: legislative, executive, and judicial, whose powers are vested by the U.S. Constitution in the Congress, the president, and the federal courts, respectively. The powers and duties of these branches are further defined by acts of Congress, including the creation of executive departments and courts inferior to the Supreme Court.

Naming

Political system of the United States
 
The full name of the republic is "United States of America". No other name appears in the Constitution, and this is the name that appears on money, in treaties, and in legal cases to which it is a party (e.g. Charles T. Schenck v. United States). The terms "Government of the United States of America" or "United States Government" are often used in official documents to represent the federal government as distinct from the states collectively. In casual conversation or writing, the term "Federal Government" is often used, and the term "National Government" is sometimes used. The terms "Federal" and "National" in government agency or program names generally indicate affiliation with the federal government (Federal Bureau of Investigation, National Oceanic and Atmospheric Administration, National Park Service). Because the seat of government is in Washington, D.C., "Washington" is commonly used as a metonym for the federal government.

History

The United States government is based on the principles of federalism and republicanism, in which power is shared between the federal government and state governments. The interpretation and execution of these principles, including what powers the federal government should have and how those powers can be exercised, have been debated ever since the adoption of the Constitution. Some make the case for expansive federal powers while others argue for a more limited role for the central government in relation to individuals, the states, or other recognized entities. 

Since the American Civil War, the powers of the federal government have generally expanded greatly, although there have been periods since that time of legislative branch dominance (e.g., the decades immediately following the Civil War) or when states' rights proponents have succeeded in limiting federal power through legislative action, executive prerogative or by constitutional interpretation by the courts.

One of the theoretical pillars of the U.S. Constitution is the idea of "checks and balances" among the powers and responsibilities of the three branches of American government: the executive, the legislative, and the judiciary. For example, while the legislative branch (Congress) has the power to create law, the executive branch under the president can veto any legislation—an act which, in turn, can be overridden by Congress. The president nominates judges to the nation's highest judiciary authority, the Supreme Court, but those nominees must be approved by Congress. The Supreme Court, in turn, can invalidate unconstitutional laws passed by the Congress. These and other examples are examined in more detail in the text below.

Legislative branch

Seal of the U.S. Congress
 
The United States Congress, under Article I of the Constitution, is the legislative branch of the federal government. It is bicameral, comprising the House of Representatives and the Senate.

Makeup of Congress

House of Representatives

The 435 seats of the House grouped by state
 
The House currently consists of 435 voting members, each of whom represents a congressional district. The number of representatives each state has in the House is based on each state's population as determined in the most recent United States Census. All 435 representatives serve a two-year term. Each state receives a minimum of one representative in the House. In order to be elected as a representative, an individual must be at least 25 years of age, must have been a U.S. citizen for at least seven years, and must live in the state that he or she represents. There is no limit on the number of terms a representative may serve. In addition to the 435 voting members, there are 6 non-voting members, consisting of 5 delegates and one resident commissioner. There is one delegate each from the District of Columbia, Guam, the Virgin Islands, American Samoa, and the Commonwealth of the Northern Mariana Islands, and the resident commissioner from Puerto Rico.

Senate

In contrast, the Senate is made up of two senators from each state, regardless of population. There are currently 100 senators (2 from each of the 50 states), who each serve six-year terms. Approximately one-third of the Senate stands for election every two years.

Different powers

The House and Senate each have particular exclusive powers. For example, the Senate must approve (give "advice and consent" to) many important presidential appointments, including cabinet officers, federal judges (including nominees to the Supreme Court), department secretaries (heads of federal executive branch departments), U.S. military and naval officers, and ambassadors to foreign countries. All legislative bills for raising revenue must originate in the House of Representatives. The approval of both chambers is required to pass all legislation, which then may only become law by being signed by the president (or, if the president vetoes the bill, both houses of Congress then re-pass the bill, but by a two-thirds majority of each chamber, in which case the bill becomes law without the president's signature). The powers of Congress are limited to those enumerated in the Constitution; all other powers are reserved to the states and the people. The Constitution also includes the "Necessary and Proper Clause", which grants Congress the power to "make all laws which shall be necessary and proper for carrying into execution the foregoing powers". Members of the House and Senate are elected by first-past-the-post voting in every state except Louisiana and Georgia, which have runoffs.

Impeachment of federal officers

Congress has the power to remove the president, federal judges, and other federal officers from office. The House of Representatives and Senate have separate roles in this process. The House must first vote to "impeach" the official. Then, a trial is held in the Senate to decide whether the official should be removed from office. Although two presidents have been impeached by the House of Representatives (Andrew Johnson and Bill Clinton), neither of them was removed following trial in the Senate.

Congressional procedures

Article I, Section 2, paragraph 2 of the U.S. Constitution gives each chamber the power to "determine the rules of its proceedings". From this provision were created congressional committees, which do the work of drafting legislation and conducting congressional investigations into national matters. The 108th Congress (2003–2005) had 19 standing committees in the House and 17 in the Senate, plus 4 joint permanent committees with members from both houses overseeing the Library of Congress, printing, taxation, and the economy. In addition, each house may name special, or select, committees to study specific problems. Today, much of the congressional workload is borne by the subcommittees, of which there are around 150.

Powers of Congress

The United States Capitol is the seat of government for Congress.
 
The Constitution grants numerous powers to Congress. Enumerated in Article I, Section 8, these include the powers to levy and collect taxes; to coin money and regulate its value; provide for punishment for counterfeiting; establish post offices and roads, issue patents, create federal courts inferior to the Supreme Court, combat piracies and felonies, declare war, raise and support armies, provide and maintain a navy, make rules for the regulation of land and naval forces, provide for, arm and discipline the militia, exercise exclusive legislation in the District of Columbia, and to make laws necessary to properly execute powers. Over the two centuries since the United States was formed, many disputes have arisen over the limits on the powers of the federal government. These disputes have often been the subject of lawsuits that have ultimately been decided by the United States Supreme Court.

Congressional oversight

Congressional oversight is intended to prevent waste and fraud, protect civil liberties and individual rights, ensure executive compliance with the law, gather information for making laws and educating the public, and evaluate executive performance.

It applies to cabinet departments, executive agencies, regulatory commissions, and the presidency.
Congress's oversight function takes many forms:
  • Committee inquiries and hearings
  • Formal consultations with and reports from the president
  • Senate advice and consent for presidential nominations and for treaties
  • House impeachment proceedings and subsequent Senate trials
  • House and Senate proceedings under the 25th Amendment in the event that the president becomes disabled or the office of the vice president falls vacant
  • Informal meetings between legislators and executive officials
  • Congressional membership: each state is allocated a number of seats based on its representation (or ostensible representation, in the case of D.C.) in the House of Representatives. Each state is allocated two senators regardless of its population. As of January 2010, the District of Columbia elects a non-voting representative to the House of Representatives along with American Samoa, the U.S. Virgin Islands, Guam, Puerto Rico, and the Northern Mariana Islands.

Executive branch

The executive power in the federal government is vested in the president of the United States, although power is often delegated to the Cabinet members and other officials. The president and vice president are elected as running mates by the Electoral College, for which each state, as well as the District of Columbia, is allocated a number of seats based on its representation (or ostensible representation, in the case of D.C.) in both houses of Congress. The president is limited to a maximum of two four-year terms. If the president has already served two years or more of a term to which some other person was elected, he or she may only serve one more additional four-year term.

President

Seal of the president of the United States
 
The executive branch, under Article II of the Constitution, consists of the president and those to whom the president's powers are delegated. The president is both the head of state and government, as well as the military commander-in-chief and chief diplomat. The president, according to the Constitution, must "take care that the laws be faithfully executed", and "preserve, protect and defend the Constitution". The president presides over the executive branch of the federal government, an organization numbering about 5 million people, including 1 million active-duty military personnel and 600,000 postal service employees. 

The president may sign legislation passed by Congress into law or may veto it, preventing it from becoming law unless two-thirds of both houses of Congress vote to override the veto. The president may unilaterally sign treaties with foreign nations. However, ratification of international treaties requires a two-thirds majority vote in the Senate. The president may be impeached by a majority in the House and removed from office by a two-thirds majority in the Senate for "treason, bribery, or other high crimes and misdemeanors". The president may not dissolve Congress or call special elections but does have the power to pardon or release criminals convicted of offenses against the federal government (except in cases of impeachment), enact executive orders, and (with the consent of the Senate) appoint Supreme Court justices and federal judges.

Vice president

Seal of the vice president of the United States
 
The vice president is the second-highest official in rank of the federal government. The vice president's duties and powers are established in the legislative branch of the federal government under Article 1, Section 3, Clauses 4 and 5 as the president of the Senate; this means that he or she is the designated presiding officer of the Senate. In that capacity, the vice president has the authority (ex officio, for they are not an elected member of the Senate) to cast a tie-breaking vote. Pursuant to the Twelfth Amendment, the vice president presides over the joint session of Congress when it convenes to count the vote of the Electoral College. As first in the U.S. presidential line of succession, the vice president's duties and powers move to the executive branch when becoming president upon the death, resignation, or removal of the president, which has happened nine times in U.S. history. Lastly, in the case of a Twenty-fifth Amendment succession event, the vice president would become acting president, assuming all of the powers and duties of president, except being designated as president. Accordingly, by circumstances, the Constitution designates the vice president as routinely in the legislative branch, or succeeding to the executive branch as president, or possibly being in both as acting president pursuant to the Twenty-fifth Amendment. Because of circumstances, the overlapping nature of the duties and powers attributed to the office, the title of the office and other matters, such has generated a spirited scholarly dispute regarding attaching an exclusive branch designation to the office of vice president.

Cabinet, executive departments, and agencies

The daily enforcement and administration of federal laws is in the hands of the various federal executive departments, created by Congress to deal with specific areas of national and international affairs. The heads of the 15 departments, chosen by the president and approved with the "advice and consent" of the U.S. Senate, form a council of advisers generally known as the president's "Cabinet". Once confirmed, these "cabinet officers" serve at the pleasure of the president. In addition to departments, a number of staff organizations are grouped into the Executive Office of the President. These include the White House staff, the National Security Council, the Office of Management and Budget, the Council of Economic Advisers, the Council on Environmental Quality, the Office of the U.S. Trade Representative, the Office of National Drug Control Policy, and the Office of Science and Technology Policy. The employees in these United States government agencies are called federal civil servants

Judicial branch

The Judiciary, under Article III of the Constitution, explains and applies the laws. This branch does this by hearing and eventually making decisions on various legal cases.

Overview of the federal judiciary

Seal of the U.S. Supreme Court
 
Article III section I of the Constitution establishes the Supreme Court of the United States and authorizes the United States Congress to establish inferior courts as their need shall arise. Section I also establishes a lifetime tenure for all federal judges and states that their compensation may not be diminished during their time in office. Article II section II establishes that all federal judges are to be appointed by the president and confirmed by the United States Senate.

The Judiciary Act of 1789 subdivided the nation jurisdictionally into judicial districts and created federal courts for each district. The three tiered structure of this act established the basic structure of the national judiciary: the Supreme Court, 13 courts of appeals, 94 district courts, and two courts of special jurisdiction. Congress retains the power to re-organize or even abolish federal courts lower than the Supreme Court. 

The U.S. Supreme Court decides "cases and controversies"—matters pertaining to the federal government, disputes between states, and interpretation of the United States Constitution, and, in general, can declare legislation or executive action made at any level of the government as unconstitutional, nullifying the law and creating precedent for future law and decisions. The United States Constitution does not specifically mention the power of judicial review (the power to declare a law unconstitutional). The power of judicial review was asserted by Chief Justice Marshall in the landmark Supreme Court Case Marbury v. Madison (1803). There have been instances in the past where such declarations have been ignored by the other two branches. Below the U.S. Supreme Court are the United States Courts of Appeals, and below them in turn are the United States District Courts, which are the general trial courts for federal law, and for certain controversies between litigants who are not deemed citizens of the same state ("diversity jurisdiction"). 

There are three levels of federal courts with general jurisdiction, meaning that these courts handle criminal cases and civil lawsuits between individuals. Other courts, such as the bankruptcy courts and the Tax Court, are specialized courts handling only certain kinds of cases ("subject matter jurisdiction"). The Bankruptcy Courts are "under" the supervision of the district courts, and, as such, are not considered part of the "Article III" judiciary and also as such their judges do not have lifetime tenure, nor are they Constitutionally exempt from diminution of their remuneration. Also the Tax Court is not an Article III court (but is, instead an "Article I Court").

The district courts are the trial courts wherein cases that are considered under the Judicial Code (Title 28, United States Code) consistent with the jurisdictional precepts of "federal question jurisdiction" and "diversity jurisdiction" and "pendent jurisdiction" can be filed and decided. The district courts can also hear cases under "removal jurisdiction", wherein a case brought in State court meets the requirements for diversity jurisdiction, and one party litigant chooses to "remove" the case from state court to federal court. 

The United States Courts of Appeals are appellate courts that hear appeals of cases decided by the district courts, and some direct appeals from administrative agencies, and some interlocutory appeals. The U.S. Supreme Court hears appeals from the decisions of the courts of appeals or state supreme courts, and in addition has original jurisdiction over a few cases. 

The judicial power extends to cases arising under the Constitution, an Act of Congress; a U.S. treaty; cases affecting ambassadors, ministers and consuls of foreign countries in the U.S.; cases and controversies to which the federal government is a party; controversies between states (or their citizens) and foreign nations (or their citizens or subjects); and bankruptcy cases (collectively "federal-question jurisdiction"). The Eleventh Amendment removed from federal jurisdiction cases in which citizens of one state were the plaintiffs and the government of another state was the defendant. It did not disturb federal jurisdiction in cases in which a state government is a plaintiff and a citizen of another state the defendant.

The power of the federal courts extends both to civil actions for damages and other redress, and to criminal cases arising under federal law. The interplay of the Supremacy Clause and Article III has resulted in a complex set of relationships between state and federal courts. Federal courts can sometimes hear cases arising under state law pursuant to diversity jurisdiction, state courts can decide certain matters involving federal law, and a handful of federal claims are primarily reserved by federal statute to the state courts (for example, those arising from the Telephone Consumer Protection Act of 1991). Both court systems thus can be said to have exclusive jurisdiction in some areas and concurrent jurisdiction in others. 

The U.S. Constitution safeguards judicial independence by providing that federal judges shall hold office "during good behavior"; in practice, this usually means they serve until they die, retire, or resign. A judge who commits an offense while in office may be impeached in the same way as the president or other officials of the federal government. U.S. judges are appointed by the president, subject to confirmation by the Senate. Another Constitutional provision prohibits Congress from reducing the pay of any Article III judge (Congress is able to set a lower salary for all future judges that take office after the reduction, but may not decrease the rate of pay for judges already in office).

Relationships between state and federal courts

Separate from, but not entirely independent of, this federal court system are the court systems of each state, each dealing with, in addition to federal law when not deemed preempted, a state's own laws, and having its own court rules and procedures. Although state governments and the federal government are legally dual sovereigns, the Supreme Court of the United States is in many cases the appellate court from the State Supreme Courts (e.g., absent the Court countenancing the applicability of the doctrine of adequate and independent State grounds). The Supreme Courts of each state are by this doctrine the final authority on the interpretation of the applicable state's laws and Constitution. Many state constitution provisions are equal in breadth to those of the U.S. Constitution, but are considered "parallel" (thus, where, for example, the right to privacy pursuant to a state constitution is broader than the federal right to privacy, and the asserted ground is explicitly held to be "independent", the question can be finally decided in a State Supreme Court—the U.S. Supreme Court will decline to take jurisdiction). 

A State Supreme Court, other than of its own accord, is bound only by the U.S. Supreme Court's interpretation of federal law, but is not bound by interpretation of federal law by the federal court of appeals for the federal circuit in which the state is included, or even the federal district courts located in the state, a result of the dual sovereigns concept. Conversely, a federal district court hearing a matter involving only a question of state law (usually through diversity jurisdiction) must apply the substantive law of the state in which the court sits, a result of the application of the Erie Doctrine; however, at the same time, the case is heard under the Federal Rules of Civil Procedure, the Federal Rules of Criminal Procedure and the Federal Rules of Evidence instead of state procedural rules (that is, the application of the Erie Doctrine only extends to a requirement that a federal court asserting diversity jurisdiction apply substantive state law, but not procedural state law, which may be different). Together, the laws of the federal and state governments form U.S. law.

Budget

The budget document often begins with the president's proposal to Congress recommending funding levels for the next fiscal year, beginning October 1 and ending on September 30 of the year following. The fiscal year refers to the year in which it ends.

For fiscal year (FY) 2018, the federal government spent $4.11 trillion. Spending equalled 20.3% of gross domestic product (GDP), equal to the 50-year average. The deficit equalled $779 billion, 3.8 percent of GDP. Tax revenue amounted to $3.33 trillion, with receipt categories including individual income taxes ($1,684B or 51%), Social Security/Social Insurance taxes ($1,171B or 35%), and corporate taxes ($205B or 6%).

Elections and voting

Suffrage, known as the ability to vote, has changed significantly over time. In the early years of the United States, voting was considered a matter for state governments, and was commonly restricted to white men who owned land. Direct elections were mostly held only for the U.S. House of Representatives and state legislatures, although what specific bodies were elected by the electorate varied from state to state. Under this original system, both senators representing each state in the U.S. Senate were chosen by a majority vote of the state legislature. Since the ratification of the Seventeenth Amendment in 1913, members of both houses of Congress have been directly elected. Today, U.S. citizens have almost universal suffrage under equal protection of the laws from the age of 18, regardless of race, gender, or wealth. The only significant exception to this is the disenfranchisement of convicted felons, and in some states former felons as well. 

Under the U.S. Constitution, the representation of U.S. territories and the federal district of District of Columbia in Congress is limited: while residents of the District of Columbia are subject to federal laws and federal taxes, their only congressional representative is a non-voting delegate; however, they have been allowed to participate in presidential elections since March 29, 1961. Residents of U.S. territories have varying rights; for example, only some residents of Puerto Rico pay federal income taxes (though all residents must pay all other federal taxes, including import/export taxes, federal commodity taxes and federal payroll taxes, including Social Security and Medicare). All federal laws that are "not locally inapplicable" are automatically the law of the land in Puerto Rico but their current representation in the U.S. Congress is in the form of a Resident Commissioner, a nonvoting delegate.

State, tribal, and local governments

The states of the United States as divided into counties (or, in Louisiana and Alaska, parishes and boroughs, respectively). Alaska and Hawaii are not to scale and the Aleutian and uninhabited Northwestern Hawaiian Islands have been omitted.
 
State governments have the greatest influence over most Americans' daily lives. The Tenth Amendment prohibits the federal government from exercising any power not delegated to it by the Constitution; as a result, states handle the majority of issues most relevant to individuals within their jurisdiction. Because state governments are not authorized to print currency, they generally have to raise revenue through either taxes or bonds. As a result, state governments tend to impose severe budget cuts or raise taxes any time the economy is faltering.

Each state has its own written constitution, government and code of laws. The Constitution stipulates only that each state must have, "a Republican Government". Therefore, there are often great differences in law and procedure between individual states, concerning issues such as property, crime, health and education, amongst others. The highest elected official of each state is the Governor, with below him being the Lieutenant Governor. Each state also has an elected state legislature (bicameralism is a feature of every state except Nebraska), whose members represent the voters of the state. Each state maintains its own state court system. In some states, supreme and lower court justices are elected by the people; in others, they are appointed, as they are in the federal system. 

As a result of the Supreme Court case Worcester v. Georgia, American Indian tribes are considered "domestic dependent nations" that operate as sovereign governments subject to federal authority but, in some cases, outside of the jurisdiction of state governments. Hundreds of laws, executive orders and court cases have modified the governmental status of tribes vis-à-vis individual states, but the two have continued to be recognized as separate bodies. Tribal governments vary in robustness, from a simple council used to manage all aspects of tribal affairs, to large and complex bureaucracies with several branches of government. Tribes are currently encouraged to form their own governments, with power resting in elected tribal councils, elected tribal chairpersons, or religiously appointed leaders (as is the case with pueblos). Tribal citizenship and voting rights are typically restricted to individuals of native descent, but tribes are free to set whatever citizenship requirements they wish.

The institutions that are responsible for local government within states are typically town, city, or county boards, water management districts, fire management districts, library districts and other similar governmental units which make laws that affect their particular area. These laws concern issues such as traffic, the sale of alcohol and the keeping of animals. The highest elected official of a town or city is usually the mayor. In New England, towns operate in a direct democratic fashion, and in some states, such as Rhode Island, Connecticut, and some parts of Massachusetts, counties have little or no power, existing only as geographic distinctions. In other areas, county governments have more power, such as to collect taxes and maintain law enforcement agencies.

Monsoon

From Wikipedia, the free encyclopedia
 
Advancing monsoon clouds and showers in Aralvaimozhy, near Nagercoil, India
 
Monsoon (/mɒnˈsn/) is traditionally defined as a seasonal reversing wind accompanied by corresponding changes in precipitation, but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea. Usually, the term monsoon is used to refer to the rainy phase of a seasonally changing pattern, although technically there is also a dry phase. The term is sometimes incorrectly used for locally heavy but short-term rains, although these rains meet the dictionary definition of monsoon.

The major monsoon systems of the world consist of the West African and Asia-Australian monsoons. The inclusion of the North and South American monsoons with incomplete wind reversal has been debated.

The term was first used in English in British India and neighbouring countries to refer to the big seasonal winds blowing from the Bay of Bengal and Arabian Sea in the southwest bringing heavy rainfall to the area.

Etymology

Monsoon clouds over Lucknow, Uttar Pradesh, India
 
The etymology of the word monsoon is not wholly certain. The English monsoon came from Portuguese monção, ultimately from Arabic mawsim (موسم "season"), "perhaps partly via early modern Dutch monson."

History

Strengthening of the Asian monsoon has been linked to the uplift of the Tibetan Plateau after the collision of the Indian sub-continent and Asia around 50 million years ago. Because of studies of records from the Arabian Sea and that of the wind-blown dust in the Loess Plateau of China, many geologists believe the monsoon first became strong around 8 million years ago. More recently, studies of plant fossils in China and new long-duration sediment records from the South China Sea led to a timing of the monsoon beginning 15–20 million years ago and linked to early Tibetan uplift. Testing of this hypothesis awaits deep ocean sampling by the Integrated Ocean Drilling Program. The monsoon has varied significantly in strength since this time, largely linked to global climate change, especially the cycle of the Pleistocene ice ages. A study of marine plankton suggested that the Indian Monsoon strengthened around 5 million years ago. Then, during ice periods, the sea level fell and the Indonesian Seaway closed. When this happened, cold waters in the Pacific were impeded from flowing into the Indian Ocean. It is believed that the resulting increase in sea surface temperatures in the Indian Ocean increased the intensity of monsoons.

Five episodes during the Quaternary at 2.22 Ma (PL-1), 1.83 Ma (PL-2), 0.68 Ma (PL-3), 0.45 Ma (PL-4) and 0.04 Ma (PL-5) were identified which showed a weakening of Leeuwin Current (LC). The weakening of the LC would have an effect on the sea surface temperature (SST) field in the Indian Ocean, as the Indonesian through flow generally warms the Indian Ocean. Thus these five intervals could probably be those of considerable lowering of SST in the Indian Ocean and would have influenced Indian monsoon intensity. During the weak LC, there is the possibility of reduced intensity of the Indian winter monsoon and strong summer monsoon, because of change in the Indian Ocean dipole due to reduction in net heat input to the Indian Ocean through the Indonesian through flow. Thus a better understanding of the possible links between El Niño, Western Pacific Warm Pool, Indonesian Throughflow, wind pattern off western Australia, and ice volume expansion and contraction can be obtained by studying the behaviour of the LC during Quaternary at close stratigraphic intervals.

Strength of impact

On May 28, in the dry season
 
On August 28, in the rainy season,Western Ghats in 2010
 
The impact of monsoon on the local weather is different from place to place. In some places there is just a likelihood of having a little more or less rain. In other places, quasi semi-deserts are turned into vivid green grasslands where all sorts of plants and crops can flourish. 

The Indian Monsoon turns large parts of India from a kind of semi-desert into green lands. See photos only taken 3 months apart in the Western Ghats. In places like this it is crucial for farmers to have the right timing for putting the seeds on the fields, as it is essential to use all the rain that is available for growing crops.

Process

Monsoons are large-scale sea breezes  which occur when the temperature on land is significantly warmer or cooler than the temperature of the ocean. These temperature imbalances happen because oceans and land absorb heat in different ways. Over oceans, the air temperature remains relatively stable for two reasons: water has a relatively high heat capacity (3.9 to 4.2 J g−1 K−1), and because both conduction and convection will equilibrate a hot or cold surface with deeper water (up to 50 metres). In contrast, dirt, sand, and rocks have lower heat capacities (0.19 to 0.35 J g−1 K−1), and they can only transmit heat into the earth by conduction and not by convection. Therefore, bodies of water stay at a more even temperature, while land temperature are more variable.

During warmer months sunlight heats the surfaces of both land and oceans, but land temperatures rise more quickly. As the land's surface becomes warmer, the air above it expands and an area of low pressure develops. Meanwhile, the ocean remains at a lower temperature than the land, and the air above it retains a higher pressure. This difference in pressure causes sea breezes to blow from the ocean to the land, bringing moist air inland. This moist air rises to a higher altitude over land and then it flows back toward the ocean (thus completing the cycle). However, when the air rises, and while it is still over the land, the air cools. This decreases the air's ability to hold water, and this causes precipitation over the land. This is why summer monsoons cause so much rain over land.

In the colder months, the cycle is reversed. Then the land cools faster than the oceans and the air over the land has higher pressure than air over the ocean. This causes the air over the land to flow to the ocean. When humid air rises over the ocean, it cools, and this causes precipitation over the oceans. (The cool air then flows towards the land to complete the cycle.) 

Most summer monsoons have a dominant westerly component and a strong tendency to ascend and produce copious amounts of rain (because of the condensation of water vapor in the rising air). The intensity and duration, however, are not uniform from year to year. Winter monsoons, by contrast, have a dominant easterly component and a strong tendency to diverge, subside and cause drought.

Similar rainfall is caused when moist ocean air is lifted upwards by mountains, surface heating, convergence at the surface, divergence aloft, or from storm-produced outflows at the surface. However the lifting occurs, the air cools due to expansion in lower pressure, and this produces condensation.

Global monsoon

Africa (West African and Southeast African)

Southeast African moonsoon clouds, over Mayotte island.
 
The monsoon of western Sub-Saharan Africa is the result of the seasonal shifts of the Intertropical Convergence Zone and the great seasonal temperature and humidity differences between the Sahara and the equatorial Atlantic Ocean. It migrates northward from the equatorial Atlantic in February, reaches western Africa on or near June 22, then moves back to the south by October. The dry, northeasterly trade winds, and their more extreme form, the harmattan, are interrupted by the northern shift in the ITCZ and resultant southerly, rain-bearing winds during the summer. The semiarid Sahel and Sudan depend upon this pattern for most of their precipitation.

North America

Incoming monsoon clouds over Phoenix, Arizona
 
The North American monsoon (NAM) occurs from late June or early July into September, originating over Mexico and spreading into the southwest United States by mid-July. It affects Mexico along the Sierra Madre Occidental as well as Arizona, New Mexico, Nevada, Utah, Colorado, West Texas and California. It pushes as far west as the Peninsular Ranges and Transverse Ranges of Southern California, but rarely reaches the coastal strip (a wall of desert thunderstorms only a half-hour's drive away is a common summer sight from the sunny skies along the coast during the monsoon). The North American monsoon is known to many as the Summer, Southwest, Mexican or Arizona monsoon. It is also sometimes called the Desert monsoon as a large part of the affected area are the Mojave and Sonoran deserts. However, it is debatable whether the North and South American weather patterns with incomplete wind reversal should be counted as true monsoons.

Asia

The Asian monsoons may be classified into a few sub-systems, such as the Indian Subcontinental Monsoon which affects the Indian subcontinent and surrounding regions including Nepal, and the East Asian Monsoon which affects southern China, Taiwan, Korea and parts of Japan.

South Asian monsoon

Southwest monsoon
Onset dates and prevailing wind currents of the southwest summer monsoons in India
 
The southwestern summer monsoons occur from July through September. The Thar Desert and adjoining areas of the northern and central Indian subcontinent heat up considerably during the hot summers. This causes a low pressure area over the northern and central Indian subcontinent. To fill this void, the moisture-laden winds from the Indian Ocean rush into the subcontinent. These winds, rich in moisture, are drawn towards the Himalayas. The Himalayas act like a high wall, blocking the winds from passing into Central Asia, and forcing them to rise. As the clouds rise, their temperature drops, and precipitation occurs. Some areas of the subcontinent receive up to 10,000 mm (390 in) of rain annually. 

The southwest monsoon is generally expected to begin around the beginning of June and fade away by the end of September. The moisture-laden winds on reaching the southernmost point of the Indian Peninsula, due to its topography, become divided into two parts: the Arabian Sea Branch and the Bay of Bengal Branch

The Arabian Sea Branch of the Southwest Monsoon first hits the Western Ghats of the coastal state of Kerala, India, thus making this area the first state in India to receive rain from the Southwest Monsoon. This branch of the monsoon moves northwards along the Western Ghats (Konkan and Goa) with precipitation on coastal areas, west of the Western Ghats. The eastern areas of the Western Ghats do not receive much rain from this monsoon as the wind does not cross the Western Ghats. 

The Bay of Bengal Branch of Southwest Monsoon flows over the Bay of Bengal heading towards North-East India and Bengal, picking up more moisture from the Bay of Bengal. The winds arrive at the Eastern Himalayas with large amounts of rain. Mawsynram, situated on the southern slopes of the Khasi Hills in Meghalaya, India, is one of the wettest places on Earth. After the arrival at the Eastern Himalayas, the winds turns towards the west, travelling over the Indo-Gangetic Plain at a rate of roughly 1–2 weeks per state, pouring rain all along its way. June 1 is regarded as the date of onset of the monsoon in India, as indicated by the arrival of the monsoon in the southernmost state of Kerala.

The monsoon accounts for nearly 80% of the rainfall in India. Indian agriculture (which accounts for 25% of the GDP and employs 70% of the population) is heavily dependent on the rains, for growing crops especially like cotton, rice, oilseeds and coarse grains. A delay of a few days in the arrival of the monsoon can badly affect the economy, as evidenced in the numerous droughts in India in the 1990s. 

The monsoon is widely welcomed and appreciated by city-dwellers as well, for it provides relief from the climax of summer heat in June. However, the roads take a battering every year. Often houses and streets are waterlogged and slums are flooded despite drainage systems. A lack of city infrastructure coupled with changing climate patterns causes severe economic loss including damage to property and loss of lives, as evidenced in the 2005 flooding in Mumbai that brought the city to a standstill. Bangladesh and certain regions of India like Assam and West Bengal, also frequently experience heavy floods during this season. Recently, areas in India that used to receive scanty rainfall throughout the year, like the Thar Desert, have surprisingly ended up receiving floods due to the prolonged monsoon season.

The influence of the Southwest Monsoon is felt as far north as in China's Xinjiang. It is estimated that about 70% of all precipitation in the central part of the Tian Shan Mountains falls during the three summer months, when the region is under the monsoon influence; about 70% of that is directly of "cyclonic" (i.e., monsoon-driven) origin (as opposed to "local convection").
Northeast monsoon
Monsoon clouds in Kolkata
 
Around September, with the sun fast retreating south, the northern land mass of the Indian subcontinent begins to cool off rapidly. With this air pressure begins to build over northern India, the Indian Ocean and its surrounding atmosphere still holds its heat. This causes cold wind to sweep down from the Himalayas and Indo-Gangetic Plain towards the vast spans of the Indian Ocean south of the Deccan peninsula. This is known as the Northeast Monsoon or Retreating Monsoon. 

While travelling towards the Indian Ocean, the dry cold wind picks up some moisture from the Bay of Bengal and pours it over peninsular India and parts of Sri Lanka. Cities like Chennai, which get less rain from the Southwest Monsoon, receive rain from this Monsoon. About 50% to 60% of the rain received by the state of Tamil Nadu is from the Northeast Monsoon. In Southern Asia, the northeastern monsoons take place from October to December when the surface high-pressure system is strongest. The jet stream in this region splits into the southern subtropical jet and the polar jet. The subtropical flow directs northeasterly winds to blow across southern Asia, creating dry air streams which produce clear skies over India. Meanwhile, a low pressure system known as a monsoon trough develops over South-East Asia and Australasia and winds are directed toward Australia.

East Asian Monsoon

The East Asian monsoon affects large parts of Indo-China, Philippines, China, Taiwan, Korea and Japan. It is characterised by a warm, rainy summer monsoon and a cold, dry winter monsoon. The rain occurs in a concentrated belt that stretches east-west except in East China where it is tilted east-northeast over Korea and Japan. The seasonal rain is known as Meiyu in China, Jangma in Korea, and Bai-u in Japan, with the latter two resembling frontal rain. 

The onset of the summer monsoon is marked by a period of premonsoonal rain over South China and Taiwan in early May. From May through August, the summer monsoon shifts through a series of dry and rainy phases as the rain belt moves northward, beginning over Indochina and the South China Sea (May), to the Yangtze River Basin and Japan (June) and finally to North China and Korea (July). When the monsoon ends in August, the rain belt moves back to South China.

Australia

Monsoonal squall nears Darwin, Northern Territory, Australia
 
Also known as the Indo-Australian Monsoon. The rainy season occurs from September to February and it is a major source of energy for the Hadley circulation during boreal winter. The Maritime Continent Monsoon and the Australian Monsoon may be considered to be the same system, the Indo-Australian Monsoon. 

It is associated with the development of the Siberian High and the movement of the heating maxima from the Northern Hemisphere to the Southern Hemisphere. North-easterly winds flow down Southeast Asia, are turned north-westerly/westerly by Borneo topography towards Australia. This forms a cyclonic circulation vortex over Borneo, which together with descending cold surges of winter air from higher latitudes, cause significant weather phenomena in the region. Examples are the formation of a rare low-latitude tropical storm in 2001, Tropical Storm Vamei, and the devastating flood of Jakarta in 2007. 

The onset of the monsoon over the Maritime Continent tends to follow the heating maxima down Vietnam and the Malay Peninsula (September), to Sumatra, Borneo and the Philippines (October), to Java, Sulawesi (November), Irian Jaya and Northern Australia (December, January). However, the monsoon is not a simple response to heating but a more complex interaction of topography, wind and sea, as demonstrated by its abrupt rather than gradual withdrawal from the region. The Australian monsoon (the "Wet") occurs in the southern summer when the monsoon trough develops over Northern Australia. Over three-quarters of annual rainfall in Northern Australia falls during this time.

Europe

The European Monsoon (more commonly known as the return of the westerlies) is the result of a resurgence of westerly winds from the Atlantic, where they become loaded with wind and rain. These westerly winds are a common phenomenon during the European winter, but they ease as spring approaches in late March and through April and May. The winds pick up again in June, which is why this phenomenon is also referred to as "the return of the westerlies".

The rain usually arrives in two waves, at the beginning of June and again in mid- to late June. The European monsoon is not a monsoon in the traditional sense in that it doesn't meet all the requirements to be classified as such. Instead the return of the westerlies is more regarded as a conveyor belt that delivers a series of low pressure centres to Western Europe where they create unsettled weather. These storms generally feature significantly lower than average temperatures, fierce rain or hail, thunder and strong winds.

The return of the westerlies affects Europe's Northern Atlantic coastline, more precisely Ireland, Great Britain, the Benelux countries, Western Germany, Northern France and parts of Scandinavia.

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