Question

Why hot desert experiences extreme diurnal range of temperature ?

Answer 1

Deserts are some of most interesting terrains on the planet. These generally barren areas are home to rare species of animal and plant life, and boast very unique features concerning their natural characteristics. some deserts undergo extreme weather phenomenons, particularly temperature changes within short periods of time.

There are Hot and Dry deserts, Semiarid deserts, Coastal deserts, and Cold deserts. While each desert has specific weather properties, only the Hot and Dry deserts are subject to the aforementioned temperature extremes.

Hot and Dry deserts are typically found in the Southwest United States area, Southern Asia, South America, and Australia. These deserts can experience extreme temperature changes, with highs recorded in the 44-49° Celsius (C) range, and lows in the -18° C range. An important attribute of a Hot and Dry desert is that it has very little plant life. This leads to the belief that there are not enough plants and trees to absorb sunlight and retain heat. This means that when the sun sets and is no longer a source of heat, there is nothing left in the desert to maintain the heat as there would be if there was more plant life

In Hot and Dry deserts, there is concentrated precipitation in short bursts, usually between longer periods of no rainfall. In some seasons such as the winter, it rarely rains in Hot and Dry deserts. In some Hot and Dry deserts, the annual rainfall is less than 1.5 centimeters. This leads to a lack of humidity in the air. Humidity is necessary to block the sun’s heat, and without it, the temperatures at peak are capable of reaching 49°, as mentioned previously. This also means that the lack of humidity is responsible for not retaining any of the heat the desert was saturated with during the daytime, which is met by a response in the extreme temperature drop come nighttime.

Due to both the lack of plant life and the absence of humidity, it is no surprise that Hot and Dry deserts can lose twice as much heat in the same span as normal non-desert region

Answer 2

Answer:-

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It is actually sand, which turns the entire phenomenon hot. Sand cannot hold the heat. It acts like a mirror to the sun. During the daytime, it stays warm, and when the Sun is absent it loses all its heat making the nights colder.

Temperatures exhibit daily extremes because the atmosphere contains little humidity to block the Sun's rays. Desert surfaces receive a little more than twice the solar radiation received by humid regions and lose almost twice as much heat at night. Many mean annual temperatures range from 20-25° C.

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