Explanation: The Indian monsoon is a complex weather system characterized by a seasonal reversal of wind patterns. The monsoon season is divided into two parts: the advancing monsoon and the retreating monsoon. The advancing monsoon, which occurs from June to September, brings moisture-laden winds from the Arabian Sea and the Bay of Bengal, leading to heavy rainfall across the Indian subcontinent.
The retreating monsoon, which occurs from October to December, is the phase when the monsoon winds start to withdraw from the Indian subcontinent. During this period, the winds reverse their direction and move from the land towards the sea. However, before they completely withdraw, these winds pick up moisture from the Bay of Bengal, which is located to the east of India. This moisture is then carried towards the northeastern states of India and parts of eastern India, leading to rainfall in these regions.
The Bay of Bengal is the primary source of moisture for the retreating monsoon because of its geographical location. It is situated to the east of India and is closer to the path of the retreating monsoon winds compared to the Arabian Sea, which is located to the west. The Arabian Sea is the main source of moisture for the advancing monsoon, but as the monsoon winds start to withdraw, they move towards the Bay of Bengal, where they pick up moisture and bring it back to the northeastern parts of India.
It is important to understand the geographical and meteorological factors that influence the Indian monsoon system. The retreating monsoon plays a crucial role in the distribution of rainfall in different parts of India, particularly in the northeastern states, which rely on this phase of the monsoon for their agricultural activities and water supply.
In summary, the retreating monsoon winds pick up moisture from the Bay of Bengal, leading to rainfall in the northeastern states and parts of eastern India. This is due to the geographical location of the Bay of Bengal and the seasonal reversal of wind patterns during the monsoon season.