Why water in sea is cold during day & warm during night & coastal areas of India do not register a significant variation in temperature during winter & summer?
The heat that the ocean absorbs is mixed with the lower water quickly. That mixing spreads the heat around. At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath. The coastal areas do not experience much variation in temperature between summer and winter months because they are influenced by the moderating effect of the sea. This is because of the moderating influence of the adjoining water bodies. The land and sea breezes moderate the temperatures. The reason is that the heating or cooling capacity of water is much less as compared to land. It means that water takes more time to get hot or cold then land. Therefore areas near sea or ocean have more moderate temperature in the day time and less cooler at night.
The coastal areas do not experience much variation in temperature between summer and winter months because they are influenced by the moderating effect of the sea. This is because of the moderating influence of the adjoining water bodies. The land and sea breezes moderate the temperatures.Coastal areas experience less contrasts in temperature conditions due to moderating effect of the seas. The large water bodies helps in moderating temperature. Water has a higher heat capacity than soil and rock, so the ocean takes much longer to heat and to cool than the land. The sea has a moderating influence on the region close to it. Compared to land, water takes longer to heat and cool. Thus, oceans heat up and cool down slower than the land around them. Cool sea breeze keeps the coastal areas cooler in summer and warmer in winter than places far away from the sea. The peninsular region does not have a well- defined cold season. There is hardly any noticeable seasonal change in temperature pattern during winters due to the moderating influence of the sea in India. Places at high altitudes have moderate temperatures due to their height above sea level. Places at coastal regions have moderate temperatures due to their closeness to the sea. In coastal regions the amount of the water is more and the specific heat of water is much higher than of the land. Hence a major part of heat coming from the sun is absorbed by water the increase of temperature of water is less because of its high specific heat. Hence the temperature of the land does not change much. The reason is that the heating or cooling capacity of water is much less as compared to land. It means that water takes more time to get hot or cold then land. Therefore areas near sea or ocean have more moderate temperature in the day time and less cooler at night. The heat that the ocean absorbs is mixed with the lower water quickly. That mixing spreads the heat around. At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath. Hence even though land and sea receive same amount of heat, sea cools much more slowly and appears hot as compared to land. Moreover as soon as the outermost exposed layer loses heat convection currents set up and bring inner hotter layers out thus making water to appear hot.
The land quickly loses heat when compared to water due to the differences in heat capacity. Consequently, the temperature of the sea is relatively higher, which creates low air pressure there. This sets up a flow of cool breeze offshore, known as the land breeze. This is because of the moderating influence of the adjoining water bodies. The land and sea breezes moderate the temperatures. Coastal areas experience less contrasts in temperature conditions due to moderating effect of the seas. The large water bodies helps in moderating temperature. As such, sand gets heated or cooled more rapidly as compared to water under the similar conditions. Thus a large difference in temperature is developed between the land and the sea due to which land and sea breezes are formed. These breezes make the climate near the sea shore moderate. Movement of wind from sea to land during day and from land to sea during night During the night, reverse flow of air occurs. Land cools down rapidly and the air above the land becomes cooler. The heat that the ocean absorbs is mixed with the lower water quickly. That mixing spreads the heat around. At night, while the land cools off quickly, the water at the surface is kept warmer because the water is mixed around with the warmer water underneath. Water has a fairly high heat capacity and the ocean is huge so there is a lot of thermal energy stored in there. Once the summer is gone, it starts losing that thermal energy to the colder air. so for a while, the ocean is warmer than the air.The amount of water vapour in the air is called humidity. Humidity affects the climate of a place. The winds blowing from sea to land bring a lot of moisture with them. They make the climate in the coastal areas very humid.Hence even though land and sea receive same amount of heat, sea cools much more slowly and appears hot as compared to land. Moreover as soon as the outermost exposed layer loses heat convection currents set up and bring inner hotter layers out thus making water to appear hot. The land is able to heat up much faster than water during the day while the water is able to hold in its heat better than the land during the night due to specific heat differences between them. Specific heat is defined as the amount of energy it takes to raise the temperature of 1 gram of water 1 degree Celsius.