Prelims 2022 · Geography · Question 81
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?
Answer
Neither 1 nor 2
Statement 1: Incorrect. High clouds (like cirrus) are thin and let in much solar radiation, but they are effective at trapping outgoing longwave/infrared radiation, so their net effect is often warming, not primarily cooling.
Statement 2: Incorrect. Low clouds do absorb outgoing infrared radiation, but they also have high albedo and strongly reflect incoming solar radiation; their net effect is generally cooling, not warming.
Therefore: Neither 1 nor 2 is correct.