Upsc geography

2022-11-06 07:31:03 270 Topic Tests, 15000 Questions and Detailed Notes (Prelims + Mains)

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2022-11-05 19:25:36 Oct PIB MONTHLY Compilation Prelims 2023 by Learnfinite

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2022-11-05 19:17:19 ◇ The air coming in contact with the warmer ground surface is also heated because of transfer of heat (conduction of heat) from the ground surface through the molecules to the air. Since air is very poor conductor of heat and hence the transfer of heat from the ground surface through conduction is effective only upto a few metres in the lower atmosphere. The ground surface becomes colder than the air above during winter nights and thus heat is transferred from the lower portion of the atmosphere to the ground surface and thus the atmosphere is cooled.

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2022-11-05 19:17:19 ■ HEATING AND COOLING OF THE ATMOSPHERE

#Temperature

□ CONDUCTION

◇ The transfer of heat through the molecules of matter in any body is called conduction. The transfer of heat under the process of conduction may be accomplished in two ways viz.

(i) from one part of a body to the other part of the same body, and

(ii) from one body to the other touching body. Conduction may be effective only when there is difference in temperatures in different parts of a single body or in two bodies and the process continues till the temperatures of all parts of a body or of two touching bodies become same. It is obvious that heat moves from warmer body to the cooler body through molecular movement. ओपन / कमेंट

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2022-11-05 15:10:19 ओपन / कमेंट

2022-11-05 09:33:28 ■ HEATING AND COOLING OF THE ATMOSPHERE

#Temperature

A. Heating of the Atmosphere by Direct Insolation

◇ The heat energy is radiated from the outer surface of the sun (photosphere) in the form of long waves.

◇ The atmosphere absorbs 14 per cent of incoming short wave solar radiation through ozone, water vapour etc. present therein.

◇ Seven per cent of this energy is spread in the lower atmosphere up to the height of 2km. It is apparent that this amount is too low to heat the atmosphere significantly.

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2022-11-04 09:33:13 ◇ The 51 per cent solar energy received by the earth comprises 34 per cent as direct solar radiation and 17 per cent as diffuse day light. The heat budget of the atmosphere comprises 48 per cent of solar radiation wherein 14 per cent is received through absorption of the shortwave incoming solar radiation and 34 per cent is received from the outgoing longwave terrestrial radiation.

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