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Zorluk: ZorClimate, Weather Systems, and Monsoon of India

With reference to the upper atmospheric circulation and dynamic driving forces of the Indian Summer Monsoon, which of the following statements are correct?

  1. The establishment of the Tropical Easterly Jet Stream (TEJ) over southern peninsular India is directly linked to the intense thermal heating of the Tibetan Plateau during summer.Cevap
  2. The complete northward withdrawal of the Subtropical Westerly Jet Stream (STWJ) from the south of the Himalayas is a essential atmospheric precursor to the onset of the summer monsoon.Cevap
  3. C
    The Mascarene High is an upper-tropospheric low-pressure system formed over the Tibetan Plateau that actively sucks moist ocean air towards the north.
  4. D
    During a strong El Niño event, the Southern Oscillation Index (SOI) registers highly positive values, consistently enhancing monsoon rainfall across central India.

Cevap

The statements confirming that the Tropical Easterly Jet Stream is driven by Tibetan heating and that the northward shift of the Subtropical Westerly Jet Stream precedes the monsoon burst are correct.
The thermal heating of the Tibetan Plateau generates the upper-level divergence that feeds the Tropical Easterly Jet Stream across southern India. Concurrently, the mechanical movement of the Subtropical Westerly Jet Stream to the north of the Himalayas removes upper-level convergence, permitting the south-west monsoon to burst across the mainland.

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1
Analyze upper atmospheric dynamics over the Tibetan Plateau during summer.
Solar heating warms the high-altitude surface of Tibet, creating a thermal anticyclone in the upper troposphere (300-200 hPa). The divergence from this high-pressure region flows equatorward and forms the Tropical Easterly Jet Stream (TEJ) around latitude 14∘N14^\circ\text{N} over India.
Establishes the origin and role of TEJ in pulling the monsoon wind system.
2
Evaluate the seasonal migration of the Subtropical Westerly Jet Stream (STWJ).
During winter, the STWJ splits into two branches around the Tibetan Plateau, with the southern branch anchored south of the Himalayas. In late May to early June, as solar radiation shifts north, the STWJ abruptly shifts north of the Tibetan Plateau, allowing low-pressure monsoon troughs to rapidly establish over northern India.
Explains the trigger mechanism ('monsoon burst') in northern India.
3
Examine the geographic and pressure characteristics of the Mascarene High and El Niño/SOI dynamics.
The Mascarene High is a surface high-pressure system located at around 30∘S30^\circ\text{S} near Madagascar, pushing cross-equatorial Somali Jet winds toward India. El Niño involves warm sea surface temperature anomalies in the central/eastern tropical Pacific and negative SOI values, which disrupt Walker circulation and weaken monsoon winds.
Identifies errors in options describing atmospheric centers and teleconnections.

Anahtar Kavram

Upper Tropospheric Jet Streams and Thermal Drivers of Indian Monsoon Onset
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Konular

Climate, Weather Systems, and Monsoon of India

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