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    What are Jet streams and how do they affect the climate of India?

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    What are Jet streams and how do they affect the climate of India?

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    Jet streams are high velocity westerly winds. The westerly flows are responsible for the western disturbances experienced in the north and north-western parts of the country.

    These are of two types, westerly jet streams move to the north of Himalayas in summer and easterly jet streams move to the peninsular India.

    The movement of a jet stream affects temperatures and precipitation.

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    How do jet streams affect the Indian climate? Answer at BYJU’S IAS

    How do jet streams affect the Indian climate? Find the answer and learn more about UPSC preparation at BYJU’S.

    IAS QuestionsIAS Geography QuestionsHow Do Jet Streams Affect The Indian Climate

    How do jet streams affect the Indian climate?

    Jetstreams are a narrow belt of high altitude (above 12,000 m) westerly winds in the troposphere. They affect the Indian climate in the following ways.

    Westerly Jetstream brings the western cyclonic disturbances(originate over the Mediterranean Sea) that enter the Indian subcontinent from the west and the northwest during the winter months. An increase in the prevailing night temperature generally indicates an advance in the arrival of these cyclones disturbances.

    An easterly jet stream, called the sub-tropical easterly jet stream blows over peninsular India, approximately over 14°N during the summer months. Tropical cyclones occur during the monsoon as well as in October – November and are part of the easterly flow. These disturbances affect the coastal regions of the country.

    Further Reading: Jet Stream Geography Notes

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    What are jet streams and how do they affect the climate of India?

    What are jet streams and how do they affect the climate of India?. Ans: Hint: The term ‘jet’ gives us an idea that these are a kind of fast flowing current. In order to know whether it is a current of wind or water, we need to figure out what affects...

    What are jet streams and how do they affect the climate of India?

    Answer Verified 178k+ views 7 likes

    Hint: The term ‘jet’ gives us an idea that these are a kind of fast flowing current. In order to know whether it is a current of wind or water, we need to figure out what affects the climate significantly- water current or wind current.Complete answer:

    Jet streams

    They are the fast flowing, narrow, and meandering air currents in the atmosphere of Earth. They generally are located near the altitude of the tropopause and are westerly winds (flowing west to east) due to the Coriolis Effect (movements of water and air currents induced due to the rotation of the earth).

    An air current is a flowing movement of air within a larger body of air; they flow in the layers of air surrounding the Earth. They are formed due to the uneven heating of the Earth by the sun. As the warmed air expands due to heating it becomes lighter than the surrounding air; thus, it rises and creates a warm air current. Cooler and heavier air then steps in to replace the arisen warm air thereby forming a cool air current. Jet streams are the air currents found in the highest part of the atmosphere.

    Indian Monsoon Mechanism and the Role of SubTropical Jet Streams

    1. The jet streams impact the onset of monsoon which depends upon the upper air circulation dominated by SubTropical Jet Streams (STJ). The south west monsoon in India is directly related to the tropical easterly stream.

    2. The north east monsoon or more commonly called the winter monsoon is related to the subtropical westerly Jet Stream. It is a cold wind which pushes downwind to the surface thereby creating a high pressure on the surface.

    3. Then the dry winds from this high pressure area which is in the north western part of India, start blowing towards the low pressure area or the Bay of Bengal. These winds are also responsible for the cold waves flowing in winter in the northern part of the country including UP and Bihar.

    4. After reaching the Bay of Bengal, the westerly jet streams form the cause of north east monsoon and as this wind reaches the coast of Tamil Nadu, it causes rainfall due to the humidity received from the Bay of Bengal.

    Note:

    Jet streams are characterized by specific wind motions that are responsible for generating strong vertical shearing action, which is largely responsible for clear air turbulence. They are also one of the strongest winds in the atmosphere and their speed ranges from 129 to 225 kilometers per hour, but they can reach more than 443 kilometers per hour. They are relatively faster in winter due to the striking temperature differences between tropical, temperate, and polar air currents.

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