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Asia - Asia - Monsoons and typhoons: Summer in China is a time of variable air movement out of the western Pacific. Because of the lofty Himalayas, the westerly jet's movement is inhibited. Usually, winter monsoons usher in dry, cool conditions, replacing the rain and heat of their summer counterparts.

With the northward shift of the vertical sun, this jet shifts north, too.

Similarly, when the ITCZ is at the Tropic of Cancer, the northeast trade winds are confined to the area north of the Tropic of Cancer.Change of direction or origin of winds alters their nomenclature as noted above. The northward shift is not a slow and gradual process, as expected for most changes in weather pattern. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica.Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. In India, which has historically had a primarily agrarian economy, the Despite progress in alternative forms of irrigation, agricultural dependence on the monsoon remains far from insignificant.

It affects the Indian subcontinent, where it is one of the oldest and most anticipated weatherphenomena and an economically important pattern every year from June through September, but it is only partly understood and notoriously difficult to predict. �DA�z.�V�HN��l���$u� f�8P�c�X��o�"�(���+� ��%z�k�J�1�g�Gn�l#��>��/�`����r��f�.�~��i�@o ¡��`c��� South Asia is battling torrential monsoon rains which have pounded the region for weeks, causing widespread flooding, killing more than 250 people so far. But with the advent of globalization, such travel is gaining popularity. As such, the shift of the jet is sudden and abrupt, causing the bursting of southwest monsoon rains onto the Indian plains. 227 dead after monsoon floods devastate South Asia. In

Third, they contribute to the convergence of the Bay of Bengal branch and Arabian Sea branch of the southwest monsoon winds, increasing the intensity of precipitation over the northern part of the subcontinent. Confidence in model projections of future changes in MLPS activity is contingent on models’ ability to simulate MLPSs in the current climate. %PDF-1.2 %���� !�`e6�"21��!�9N>g9����`1�pA@�d9� PH4js C�#p�d5���zln�1�$ �h�m7���U���M��)��n����� �L�#I��p&�L���o3�L&�L�c4�O4(��Ģ%"��� � ��D��D�(�K The dry, northeasterly trade winds, and their more extreme form, the harmattan, are interrupted … The monsoon of South Asia is among several geographically distributed global monsoons. Daytime scene showing the pre-monsoon air over India. The monsoon season floods mean a high proportion of the population in South Asia is vulnerable to diseases such as dengue, malaria, leptospirosis and cholera. This results in the north-to-south flow of the winds in the form of the northeast monsoon. 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. Understanding future changes in MLPSs and associated rainfall is a necessary step toward projecting flood or drought risks in a warmer climate.GFDL’s latest coupled climate model CM4.0 projects a significant decrease in MLPS occurrence over the South Asian monsoon region, attributed mainly to a reduction in low-level relative vorticity over the core genesis region. Articles from Britannica Encyclopedias for elementary and high school students.

The region experiences some of the hottest summer temperatures in Asia.
The "monsoon of South Asia" is among several geographically distributed observations of global monsoon taking place in the Indian Subcontinent.

The 2020 summer monsoon has just about started but is already flooding large parts of Assam, Meghalaya, northern Bangladesh, Bhutan, Sikkim and Nepal. Chat with us in Facebook Messenger. The two regimes of monsoon are the Southeast Asian summer monsoon (10°–20°N) and the western North Pacific summer monsoon (10°–20°N, 130°–150°E), and are separated by a boundary over the South China Sea (Kripalani and Kulkarni, 1997). The reverse shift takes place for the northeast monsoon winds, leading to a second, minor burst of rainfall over the eastern Indian Peninsula during the Northern Hemisphere winter months. An estimated 50 people have been killed in these parts of South Asia, including 23 in Assam and 18 in Nepal. According to this theory, the onset of the southwest monsoon is driven by the shift of the subtropical westerly jet north from over the plains of India toward the Tibetan Plateau. These are the most monitored components of the monsoon, and they determine the water availability in India for any given year.The rainfall is a result of the convergence of wind flow from the Although the southwest and northeast monsoon winds are seasonally reversible, they do cause precipitation on their own. The South Asia monsoon season is vital for agriculture and livelihoods in the region. Monsoon low-pressure systems (MLPSs) are the primary rain-producing synoptic-scale systems over the Indian subcontinent, and are estimated to be responsible for more than half of the annual precipitation in agrarian North and Central India. ����P��6DC4r D��f. One of the most commonly used words to describe the erratic nature of the monsoon is "vagaries", used in newspapers,Normally, the southwest monsoon can be expected to "burst" onto the western coast of India (near The northeast monsoon usually "bursts" around 20 October and lasts for about 50 days before withdrawing.However, a rainy monsoon is not necessarily a normal monsoon — that is, one that performs close to Theories of the mechanism of the monsoon primarily try to explain the reasons for the seasonal reversal of winds and the timing of their reversal. This huge monsoon wind system then stretches into the Indian Ocean. Based on the time of year that these winds bring rain to India, the monsoon can also be categorized into two The complexity of the monsoon of South Asia is not completely understood, making it difficult to accurately predict the quantity, timing, and geographic distribution of the accompanying precipitation.