Upsc geography

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2022-11-01 18:30:13 ◇ The portion of incident radiation energy reflected back from a surface is called albedo. Various attempts have been made to measure total albedo of the earth (including its atmosphere). Various data derived so far indicate the earth's average albedo fluctuating between 29 per cent and 34 per cent (including the energy reflected through the mechanism of diffuse reflection by dust particles, water molecules etc., (from the cloud surface and from the earth's surface).

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2022-11-01 18:30:13 ■ EFFECTS OF ATMOSPHERE

#Insolation

□ Reflection

◇ The scattering of incoming solar radiation waves by dust particles and molecules of water vapour (clouds) when the diameter of these particles is longer than the wavelengths of incoming solar radiation is called diffuse reflection which sends some portion of incoming solar energy back to space.

◇ The diffused and scattered solar energy present in the lower atmosphere enables us to see even the dark portion of the moon. One can also see (if not suffering from cataract) even in the pitch darkness of night.

◇ Some of the scattered and diffused solar energy reaches the ground surface. Such energy is called as diffuse blue light of the sky or diffuse day light. Some portion of incoming solar radiation is reflected back to space by high clouds (27 per cent) and by the ice-covered ground surface (2 per cent). ओपन / कमेंट

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2022-11-01 09:33:53 ■ EFFECTS OF ATMOSPHERE

#Insolation

□ Scattering

◇ Some portion of the incoming electromagnetic solar radiation (23%) is scattered in the atmosphere by dust particles and haze. Six per cent of this scattered energy is sent back to space while 17 per cent reaches the earth's surface. The process of scattering is selective in nature. Scattering becomes possible when the diameter of invisible dust particles suspended in the air and the molecules of the atmospheric gases is shorter than the wave lengths of the solar radiation waves.

◇ Blue light of the incoming shorter wavelengths is more scattered than red light.

◇ This is the reason that the sky looks blue, Sifferlin, the picturesque reddish hue of the sky during sunrise (dawn) and sunset (twilight) is the result of scattering of all the colour spectra except the red and orange because at the time of sunrise and sunset the oblique rays have to pass through the longest path of the atmosphere.

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