why is a desert cold at night but hot during the day?

Question

why are they i would like to know

Answer 1

Deserts are hot primarily because of the lack of water. When the sun shines on the ground, all of the absorbed sunlight goes into raising the ground's temperature. If there was moisture in the soil, much of this heat would go into evaporation of some of the water, pumping water vapor in the air, and keeping the soil cooler that it would otherwise be. This cooling is from the "latent" heat of evaporation that is required to change liquid water into water vapor. Associated with the lack of water is a lack of vegetation, which also evaporates water as part of photosynthesis -- a process called evapotranspiration. The vegetation itself doesn't cool the desert -- it's the water being processed by the vegetation. In fact, since vegetation is darker than most desert soils, if a desert could have vegetation that didn't need water to live, the desert would actually be hotter since it would absorb more sunlight! Similarly, if deserts were covered by dark soil rather than light soil or sand, they would also be hotter. The common view that deserts are so hot because of the bright sand is, therefore, incorrect. DESERTS ARE COLD AT NIGHT:Because of the lack of water in the ground, and little water vapor in the air, most deserts can get quite cool at night. This is because (1) dry ground does not retain as much heat as moist ground, and (2) water vapor is the most important greenhouse gas, so dry air allows the surface to cool rapidly at night through loss of infrared radiation to outer space. In fact, it has been estimated that the Sahara Desert actually loses more infrared radiation than it gains solar radiation from the sun.

Answer 2

Cold Deserts

Answer 3

The truth is regardless of what others before have stated, different deserts around the world get hot/day & cold/nights differently for different reasons. Almost all of the above scientific explanations apply somewhere, but being deployed around the world for the USMC I've personally experienced that they most CERTAINLY do fluctuate to some degree, I.e. Afghanistan is almost 120degrees during the day, yet a some times of the year gets almost 30 degrees Fahrenheit wreaking absolute havok on both soldiers AND our equipment. Seek you're answers as they pertain to particular deserts at different times of the year and accept no opinions as scientific proof. Get out and see the world, just don't go alone.

Answer 4

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The air in and over a desert is very dry. Therefore, in the day there are usually no clouds to scatter the sunlight back into space. In addition, water vapor has a higher specific heat than dry air, so a humid environment impedes a rise in temperature. Their is little water vapor in desert air, so that temperature-dampening effect is not present. At night, the hot ground radiates infrared energy; both clouds and water vapor in the air impedes this (the water vapor absorbs and re-radiates it in all directions, so about half is returned to the ground. Again, neither of those processes is present in a desert. Go to Google and enter "why does a desert get cold at night" and you will get numerous responses (including some previous Yahoo answers) that say essentially what I've said above.

Answer 5

Cool Deserts

Answer 6

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RE:
why is a desert cold at night but hot during the day?
why are they i would like to know

Answer 7

Deserts don't get cold at night. Places like Phoenix or Death Valley can be 90 or even 100 plus degrees at 10 o clock at night. The coolest deserts get at night is in the seventies.

Answer 8

At day the sand contains silicon which absorbs the surrounding heat while at night it cools down by radiating heat into the surrounding,thus the temperature is hot at day and cild at night

Answer 9

Dry desert air heats and cools faster than moist ocean air because water takes a lot of energy to heat. As a result, coastal temp fluctuations may be 20-30 degrees, but desert air can fluctuate 60-80 degrees.

Answer 10

That's an interesting question!

Answer 11

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