Question

Which of the following places has the maximum diurnal range of temperature?

(a) Mumbai
(b) Delhi
(c) Chennai
(d) Jaisalmer

Give the correct explanation​

Answer 1

Option D - Jaisalmer

■ Explanation :-

• The diurnal temperature range (DTR) is the difference between the daily maximum and minimum temperature of a place.

Following factors can impact diurnal temperature range :-

• Length of the day :- The greater (or shorter) the number of daylight hours, the more (or less) time the Earth is subject to heating. Length of daylight hours is determined by geographic location as well as season.

• Cloudiness :- Clouds are good at both absorbing and giving off longwave radiation, and at reflecting shortwave radiation . On cloudy days, the ground is shielded from incoming solar radiation because this energy is reflected back out into space. Less incoming heat means decrease in diurnal temperature variation. On cloudy nights, diurnal range is also decreased, but for opposite reasons heat is trapped near the ground, which allows the day’s temperatures to remain constant rather than to cool.

• Elevation :- Because mountain areas are located farther from the radiating heat source they are warmed less and also cool more rapidly after sunset than do valleys.

• Humidity :- Water vapor is good at absorbing and giving off longwave radiation as well as absorbing in the near-infrared part of solar radiation, which reduces the amount of daytime energy reaching the surface. Because of this, daily highs are typically lower in humid environments than they are in dry environments. This is the primary reason why desert regions experience some of the most extreme day-to-night temperature fluctuations.

• Wind speed :- Winds cause air at different levels of the atmosphere to mix. This mixing lessens the difference in temperature between warmer and cooler air, thus decreasing the diurnal temperature range.

■ About Jaisalmer :-

• Jaisalmer is located in the western part of Rajasthan which is far away from the sea coast and is deprived of the moderating effect of the sea.

• Further, sand heats up and cools down more quickly than other rocks and soils.

• This leads in very high temperature during the day and very low temperature at night and results in high range of temperature at Jaisalmer.

Hope It helps you.

Answer 2

Which of the following places has the maximum diurnal range of temperature?

(a) Mumbai

(b) Delhi

(c) Chennai

(d) Jaisalmer

Option D is the correct answer.... Thank you