(Q) The winter rains In
North India are largely related to Jet Streams and Western Disturbances. Bring
out the relationship. (About 150 words,IAS-2008)
Ans.
- Jet Streams principle is the latest concept about the origin of monsoon.
- It is based on Jet Streams found in lowermost atmospheric layer, extending from about 8 km at the poles and 16 km at equator.
- The period of the retreating monsoon is from mid September to mid December.
- It marks transitional weather conditions between hot-wet and cool-dry weather.
- Due to westerly Jet-Stream, cyclonic rainfall is experienced in October.
- North India receives less rainfall from these Jet Stream compared to the Coromandal Coast (Tamil Nadu) due to exclusive local relief factors.
- The south-westerly winds gradually retreat.
- Violent tropical cyclone is also formed in the Bay of Bengal and the Arabian Sea.
- It causes great destruction in Godavari and Krishna deltaic region.
- Troposphere is a perfect place for the activities of Jet Streams due to all phenomenon of weather and climate which physically affect men take-place within this layer.
- Troposphere contains water vapour which mixes perfectly with air and its various proportion gives rise to the different phenomenon like rain, Snow hail or sleet.
- So, Jet Streams have an important role in the weather changes.
- NOTE: More details of Jet Stream @ http://tusharupsc.blogspot.in/2011/11/jet-streams.html
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