Question

How do the Himalayas act as a climatic divide for India?

• A. They allow cold arctic winds to cool the plains.
• B. They prevent cold Arctic winds from entering and block monsoon winds to cause rain.
• C. They lower the oxygen levels causing the plains to be cooler than the mountains.
• D. They prevent the Jet streams from entering the stratosphere.

Answer 1

Answer:

B. They prevent cold Arctic winds from entering and block monsoon winds to cause rain.

Role of the Himalayas in India's Climate

Climatic Barrier Function

• The Himalayas, due to their immense height and continuous chain, act as a significant natural barrier, profoundly influencing India's climate.

• Prevention of Cold Winds: They effectively block the frigid winds originating from Central Asia and Siberia (Arctic region) from entering the Indian subcontinent during winter. This prevents India from experiencing extreme cold temperatures that would otherwise be typical for its latitude.

• Monsoon Deflection and Precipitation: The mountain range plays a crucial role in the Indian monsoon system.

  • Southwest Monsoon: As the moisture-laden Southwest Monsoon winds blow inland from the Arabian Sea and the Bay of Bengal, they are obstructed by the Himalayas.

  • Orographic Rainfall: This obstruction forces the monsoon winds to rise, cool, and condense, leading to heavy rainfall, especially on the southern slopes of the Himalayas (e.g., Cherrapunji and Mawsynram in Meghalaya, which receive some of the highest rainfall in the world). This process is known as orographic rainfall.

  • Eastern and Northeastern India: The mountains also channelize these monsoon winds, contributing significantly to the rainfall patterns in eastern and northeastern India.

• Protection from Westerlies: The Himalayas also shield the plains of North India from the strong westerly winds that blow across Central Asia.

• Influence on Temperature: The absence of these extremely cold winds contributes to the relatively moderate winter temperatures experienced in most parts of India compared to other regions at similar latitudes.