What are monsoons?.Explain.
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A monsoon is a seasonal shift in the prevailing wind direction, that usually brings with it a different kind of weather. It almost always refers to the Asian monsoon, a large region extending from India to Southeast Asia where monsoon conditions prevail.
During the winter monsoon, a persistent and large high pressure zone over Asia drives cool, dry air soutward toward the tropics. This provides the monsoon region with its dry season.
Then during May and June of each year, the summer monsoon arrives with persistent southerly wind flow driven by a warm air mass with low pressure at the surface that forms over southern Asia as it is warmed by the sun. Air from the relatively higher pressure air mass over the Indian and tropical western Pacific Ocean flows northward toward the low pressure over land, bring with it torrential rains. A late arrival of the monsoon can be bad for agriculture, as the monsoon rains are necessary for summer crops.
In India, for example, the dry northerly wind flow over India changes direction, and warm humid air from the Indian Ocean flows from the south, gradually overspreading the Indian subcontinent. Widespread torrential rains, and even severe thunderstorms, large hail and tornadoes can accompany the onset (arrival) of the summer monsoon.
The Indian Ocean version of the hurricane, which is traditionally called a "cyclone" in the Indian Ocean, can also form and move ashore in association with the onset of the monsoon. These cyclones have at times killed many thousands of poor people who live in the low-lying areas along the eastern coast of India and Bangladesh.
A weaker and much more localized monsoon occurs over the normally dry southwestern United States in the late summer when more humid air, accompanied by thunderstorms, overspreads the region
During the winter monsoon, a persistent and large high pressure zone over Asia drives cool, dry air soutward toward the tropics. This provides the monsoon region with its dry season.
Then during May and June of each year, the summer monsoon arrives with persistent southerly wind flow driven by a warm air mass with low pressure at the surface that forms over southern Asia as it is warmed by the sun. Air from the relatively higher pressure air mass over the Indian and tropical western Pacific Ocean flows northward toward the low pressure over land, bring with it torrential rains. A late arrival of the monsoon can be bad for agriculture, as the monsoon rains are necessary for summer crops.
In India, for example, the dry northerly wind flow over India changes direction, and warm humid air from the Indian Ocean flows from the south, gradually overspreading the Indian subcontinent. Widespread torrential rains, and even severe thunderstorms, large hail and tornadoes can accompany the onset (arrival) of the summer monsoon.
The Indian Ocean version of the hurricane, which is traditionally called a "cyclone" in the Indian Ocean, can also form and move ashore in association with the onset of the monsoon. These cyclones have at times killed many thousands of poor people who live in the low-lying areas along the eastern coast of India and Bangladesh.
A weaker and much more localized monsoon occurs over the normally dry southwestern United States in the late summer when more humid air, accompanied by thunderstorms, overspreads the region
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WHAT ARE MONSOONS :
The phenomenon of monsoon refers to the seasonal reversal of winds. The offshore winds that blow from north-east direction are reversed into onshore south western winds. This phenomenon is based upon differential heating of land and ocean bodies. During summer in the Indian subcontinent, the large landmass gets heated up more rapidly than the neighbouring seas. As a result, the air above land expands and rises up. The moisture laden winds arrive on the western coast of India from the south western side and cause heavy rainfall on the windward side of the Western Ghats. The leeward side, however, receives little rain. Further rain occurs in the northern plains and north-east parts of India with the branching of the monsoon. The monsoon is also aided by the Inter Tropical Convergence Zone or monsoon trough near the equator where winds from northern and southern hemisphere merge. The landmass of the Indian subcontinent cools up around September with the sun retreating south. The ocean bodies, which lose heat slowly, retain the summer heat. The cooler high pressure air moves towards the low pressure over the ocean and causes the retreating north-east monsoon. It mainly causes rainfall along the eastern coast of India.
MONSOON HAS 2 BRANCHES :
The two branches of Monsoon are:
Monsoons in India arrive at the southern tip of the Indian peninsula by first week of June and then proceeds to Arabian sea branch and Bay of Bengal branch.
a. Arabian sea Branch- The south west monsoon after breaking on the southern part of the Peninsula in early June, the branch known as the Arabian Sea monsoon reaches Bombay around June 10, and it has settled over most of South Asia by late June, bringing cooler but more humid weather.
b. Bay of Bengal Branch- The southwest monsoon moves northward in the Bay of Bengal and spreads over most of Assam by the first week of June. On encountering the barrier of the Great Himalayan Range, it is deflected westward along the Indo-Gangetic Plain toward New Delhi. Thereafter the two branches merge as a single current bringing rains to the remaining parts of North India in July.
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UR ANSWER IS HERE ..
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WHAT ARE MONSOONS :
The phenomenon of monsoon refers to the seasonal reversal of winds. The offshore winds that blow from north-east direction are reversed into onshore south western winds. This phenomenon is based upon differential heating of land and ocean bodies. During summer in the Indian subcontinent, the large landmass gets heated up more rapidly than the neighbouring seas. As a result, the air above land expands and rises up. The moisture laden winds arrive on the western coast of India from the south western side and cause heavy rainfall on the windward side of the Western Ghats. The leeward side, however, receives little rain. Further rain occurs in the northern plains and north-east parts of India with the branching of the monsoon. The monsoon is also aided by the Inter Tropical Convergence Zone or monsoon trough near the equator where winds from northern and southern hemisphere merge. The landmass of the Indian subcontinent cools up around September with the sun retreating south. The ocean bodies, which lose heat slowly, retain the summer heat. The cooler high pressure air moves towards the low pressure over the ocean and causes the retreating north-east monsoon. It mainly causes rainfall along the eastern coast of India.
MONSOON HAS 2 BRANCHES :
The two branches of Monsoon are:
Monsoons in India arrive at the southern tip of the Indian peninsula by first week of June and then proceeds to Arabian sea branch and Bay of Bengal branch.
a. Arabian sea Branch- The south west monsoon after breaking on the southern part of the Peninsula in early June, the branch known as the Arabian Sea monsoon reaches Bombay around June 10, and it has settled over most of South Asia by late June, bringing cooler but more humid weather.
b. Bay of Bengal Branch- The southwest monsoon moves northward in the Bay of Bengal and spreads over most of Assam by the first week of June. On encountering the barrier of the Great Himalayan Range, it is deflected westward along the Indo-Gangetic Plain toward New Delhi. Thereafter the two branches merge as a single current bringing rains to the remaining parts of North India in July.
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