GS PrelimsGeography (Physical)Clouds and Precipitation2022

Consider the following statements : 1. High clouds primarily reflect solar radiation and cool the surface of the Earth. 2. Low clouds have a high absorption of infrared radiation emanating from the Earth's surface and thus cause warming effect. Which of the statements given above is/are correct?

A

1 only

B

2 only

C

Both 1 and 2

D

Neither 1 nor 2

Correct Answer: Option D

Explanation

1. Statement 1: High clouds (e.g., cirrus) are generally thin and composed of ice crystals. They allow much of the incoming solar radiation to pass through but are effective at trapping outgoing infrared radiation (heat) from the Earth's surface. Therefore, they tend to have a net warming effect, not primarily a cooling effect by reflecting solar radiation. Thus, statement 1 is incorrect. 2. Statement 2: Low clouds (e.g., stratus, cumulus) are typically thicker and composed of water droplets. They have a high albedo, meaning they reflect a significant amount of incoming solar radiation back to space, leading to a net cooling effect on the surface. While they do absorb and emit infrared radiation, their dominant effect is cooling through reflection, not warming through high absorption of terrestrial infrared radiation. Thus, statement 2 is incorrect. 3. Since both statements are incorrect, the correct option is (D).

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