In coastal area, wind current moves from sea towards the land during; but during night it moves from land to sea. Discuss the reason.
Specific heat capacity of water is greater than that of land (soil, sand, stone etc.). So, increase in temperature of water is less in comparison to that of land. So, during day land becomes hotter than water and so air above land becomes hotter than that above ocean and sea. Since, hot air is rarer than cold air and becomes lighter in weight, so, rises up. While, above sea or ocean has denser air. This denser air blows to coastal area to fill up that empty space. But during night due to larger specific heat capacity of water it cools down slowly but due to less specific heat capacity of land it cools down more fast. Thus, condition of air during night becomes just opposite to that during day. So, during night air above land becomes colder and above sea or ocean remains comparatively hotter and this hotter air rises up. So, colder air above land blows to sea or ocean to fill up its space. So, wind current moves from sea towards the land during day; but during night it moves from land to sea.