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Zorluk: Çok zorClimate, Weather Systems, and Monsoon of India

Consider the following statements regarding winter atmospheric circulation and precipitation mechanisms over the Indian subcontinent:

1. The Subtropical Westerly Jet Stream shifts south of the Himalayas during winter, splitting into two distinct branches due to the physical barrier of the Tibetan Plateau.
2. Western Disturbances, which bring vital winter rainfall to northwestern India, are steered across Eurasia into the subcontinent by the Tropical Easterly Jet Stream.
3. The winter rainfall along the Coromandel Coast of Tamil Nadu is predominantly caused by the moisture-laden winds of the North-East Monsoon picking up moisture over the Bay of Bengal.

Which of the statements given above are correct?

  1. 1 and 3 onlyCevap
  2. B
    1 and 2 only
  3. C
    2 and 3 only
  4. D
    1, 2, and 3

Cevap

The correct statements are 1 and 3 only.
The southern branch of the Subtropical Westerly Jet Stream flows south of the Himalayas during winter and guides mid-latitude extratropical cyclones (Western Disturbances) into northwestern India. Simultaneously, the North-East Monsoon winds cross the Bay of Bengal, gather moisture, and bring rainfall to the Coromandel Coast.

Adım Adım Çözüm

1
Evaluate Statement 1 regarding winter upper-air circulation
Statement 1 is correct
During the northern hemisphere winter, the southward shift of the Inter-Tropical Convergence Zone (ITCZ) draws the Subtropical Westerly Jet Stream south of the Himalayas. The high-altitude Tibetan Plateau acts as a mechanical barrier, splitting the jet stream into northern and southern branches.
2
Evaluate Statement 2 regarding the steering mechanism of Western Disturbances
Statement 2 is incorrect
Western Disturbances are shallow cyclonic depressions originating over the Mediterranean region. They are driven eastward into northwestern India by the southern branch of the Subtropical Westerly Jet Stream during winter. The Tropical Easterly Jet Stream (TEJ) is active only during the summer monsoon months.
3
Evaluate Statement 3 regarding Coromandel Coast precipitation
Statement 3 is correct
During winter (October to December), dry land-to-sea winds of the North-East Monsoon blow across the Bay of Bengal, picking up significant moisture before striking the Coromandel Coast of Tamil Nadu and producing rainfall.

Anahtar Kavram

Subtropical Westerly Jet Stream and North-East Monsoon precipitation dynamics
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Konular

Climate, Weather Systems, and Monsoon of India

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