In coastal area, wind current moves from the sea towards the land during day, but during night it moves from land to the sea. Discuss the reason.

Explanation

In coastal areas, during deytime, there is a regular flow of cool air from the sea towatds the land. At night, there is a reverse flow of air from land to sea. This happens because during the daytime, land gets heated faster than water and radiated heat from land, heats the air above it. The hot air rises and creates an area of low pressure. Sea water does not get heated so rapidly, so air above the sea is comparatively cool A high pressure area forms above sea water as compared to air over land. Therefore, cooler air over the sea, flows towards the land (region of low pressure) area. The movement of air from one region to the other creates winds.

During the night, reverse flow of air occurs. Land cools down rapidly and the air above the land becomes cooler. Sea water cools down slowly so, the air above the sea is hotter and has a lower air pressure as compared to air pressure above the land. Therefore, cooler air present over land flows towards sea.