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Zorluk: OrtaClimate, Weather Systems, and Monsoon of India

During the South-West monsoon season in India, a temporary interruption in rainfall known as a 'monsoon break' occurs when the low-pressure monsoon trough shifts northward toward the Himalayan foothills. Which of the following spatial rainfall distribution patterns best characterizes the Indian subcontinent during such a break period?

  1. Heavy rainfall becomes concentrated along the Himalayan foothills and parts of Northeast India, while rainfall decreases significantly over the central and northern Indian plains.Cevap
  2. B
    Widespread heavy precipitation intensifies across the central Indian plains and the Western Ghats, while the Himalayan belt experiences prolonged drought.
  3. C
    The Coromandel Coast of Tamil Nadu receives its peak annual rainfall while precipitation completely ceases across all of Northern and Northeastern India.
  4. D
    Torrential convective rainfall becomes confined exclusively to North-West India and the Thar Desert due to the strengthening of the thermal heat low.

Cevap

Heavy rainfall becomes concentrated along the Himalayan foothills and parts of Northeast India, while rainfall decreases significantly over the central and northern Indian plains.
During the months of July and August, when the monsoon trough shifts northward to lie close to the foothills of the Himalayas, a 'break' in the monsoon occurs over major parts of India. During this phase, rainfall decreases substantially over the central, western, and northern plains, whereas heavy rainfall becomes concentrated along the Himalayan foothills, Northeastern states, and the catchment areas of Himalayan rivers, often causing floods in these regions.

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1
Identify the meteorological feature described in the stem.
The stem describes a 'monsoon break' caused by the northward displacement of the monsoon trough.
Understanding the position of the monsoon trough is essential for determining spatial rainfall changes.
2
Analyze the atmospheric dynamics of the northward trough displacement.
When the monsoon trough moves north toward the Himalayas, moisture-laden winds encounter the mountainous barrier, resulting in heavy rainfall along the foothills.
Topographic uplift along the Himalayas enhances precipitation locally while rain-bearing depressions fail to form over the plains.
3
Determine the impact on the rest of the country.
With the trough displaced from the central plains, dry spells prevail over central, northern, and western India.
The absence of low-pressure cyclonic disturbances over central India leads to a temporary suppression of widespread rainfall.

Anahtar Kavram

Monsoon Break Dynamics and Spatial Rainfall Variation
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Konular

Climate, Weather Systems, and Monsoon of India

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