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The monsoon of South Asia is among several geographically distributed observations of global monsoon taking place in the Indian Subcontinent. In the Subcontinent, it is one of oldest weather observations, an economically important weather pattern over June through September every year, and the most anticipated weather event and unique weather phenomenon. Yet it is only partially understood and notoriously difficult to predict. Several theories have been proposed explaining the origin, the process, the strength, the variability, the distribution and the general vagaries of the monsoon of the Indian Subcontinent, but understanding of the phenomenon and its predictability are still evolving. The unique geographical features of the subcontinent, along with associated atmospheric, oceanic and geophysical components, are influential in ensuring the anticipated behavior for a monsoon in the Indian Subcontinent. Due to its effect on agriculture, flora and fauna and the general weather of India, Bangladesh, Bhutan, Pakistan, Sri Lanka, etc., among other economic, social and environmental effects, a monsoon is one of the most anticipated, followed and studied weather phenomena of the Indian subcontinent. It has significant impact on the overall well-being of subcontinent residents and has even been dubbed the "real finance minister of India". ==Definition== ''Monsoon'', derived from the Arabic word "mausim" meaning "season", although generally defined as a system of winds characterized by a seasonal reversal of its direction,〔 lacks a consistent detailed definition. Some examples are given below: * The American Meteorological Society defines it as ''a name for seasonal winds'', first applied to the winds blowing over the Arabian Sea from northeast for six months and southwest for six months. Later it has been extended to similar winds in other parts of the world. *Intergovernmental Panel on Climate Change (IPCC) describes Monsoon as a tropical and subtropical seasonal reversal in both the surface winds and associated precipitation, caused by differential heating between a continental-scale land mass and the adjacent ocean.〔(【引用サイトリンク】url=http://www.ipcc.ch/publications_and_data/ar4/wg1/en/annex1sglossary-e-o.html )〕 * Indian Meteorological Department defines it as the seasonal reversals of the wind direction along the shores of the Indian Ocean, especially in the Arabian Sea, that blow from the southwest during one half of the year and from the northeast during the other half.〔(【引用サイトリンク】url=http://www.imd.gov.in/section/nhac/dynamic/Met_Glossary.htm )〕 * Colin Stokes Ramage in ''Monsoon Meteorology'', International Geophysics Series, Vol. 15, defines Monsoon as a seasonal reversing wind accompanied by corresponding changes in precipitation. Monsoon of the subcontinent is primarily noted for its rain bearing ability and for the associated unpredictability of the weather. Consequently, some definitions incorporate rain in its definition.〔(【引用サイトリンク】url=http://en.wiktionary.org/wiki/monsoon )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Monsoon of South Asia」の詳細全文を読む スポンサード リンク
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