Question

why there is wide difference between day and night temperature

Answer 1

Hey dear...

I think the question should be...

Why there is wide difference between day and night temperature in deserts??????

So your answer is.......

The main reasons for the temperature fluctuations between day and night are the lack of humidity and cloud cover. Because of water's relatively high specific heat, humid air takes longer to warm or cool, while drier air warms or cools more quickly. Because desert areas receive a large amount of sunlight, the temperatures can get very high, but when the sun is no longer providing heat, the dry air cools quickly. The lack of cloud cover overhead allows the warmer air to rise into the atmosphere while cooler air settles in its place. Basically, desert temperatures vary so much because there is less moisture and cloud cover to keep the heat there.

Hope it helps you!!!!!!

Answer 2

You are definitely correct about the role moisture and clouds play to control the day/night temperature difference. However, water's absorptivity in the in the infrared spectrum is more important for vertical heat transport in dry environments than thermodynamic variables such as its heat capacity. Water is a major greenhouse gas and absorbs thermal energy efficiently. Since deserts have significantly less water vapor than other areas, a comparatively large fraction of energy that is absorbed by the desert surface during the day can radiate back into space at night.
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