Question

What is the significance of the north-east trade winds in the winter season?

Answer 1

Hint: This absolute reversal of wind direction from North-East to South-West and vice-versa is called monsoons. These winds are planetary winds that essentially are land bearing winds.

Complete answer:
The temperature over the Indian Ocean is moderately low. Therefore a comparatively high-pressure region is formed over the seas. This indicates that the usual movement of air in June results from the equatorial zone of the Indian Ocean. This direction is opposite to that of the trade winds i.e. North-East to South-West that prevails during the winter season in India. These winds carry a lot of moisture along. Therefore, when these moisture-laden winds move over the Indian subcontinent they let widespread rain to occur throughout India. From June to September the rainy season is seen. During the winter season, North-East trade winds predominate the Indian subcontinent. They blow from land to sea. This is the reason why most part of the country experiences a dry season during this time. North-East trade winds also blow over the Bay of Bengal. They concentrate moisture which causes rainfall in the Coromandel coast. However, the rest of the country continues to experience dryness. In India, these winds are considered as land bearing winds.

Note: The pressure difference that occurs between the North Central Indian Plains and the Indian Ocean makes the air from the high-pressure area of the sea to move towards the low-pressure area of Northern India.