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homework6 - Global Warming Chapter 5 Questions Alyssa...

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Global Warming Chapter 5 Questions Alyssa Griffith  6. Associated with the melting of sea-ice which results in increased evaporation from the water  surface, additional low cloud can appear. How does this affect the ice-albedo feedback? Does it  tend to make it more or less positive? Variables used to describe climate are mainly concerned with the atmosphere. Clouds  can most definitely interfere with the transfer of radiation in the atmosphere. They reflect a  certain proportion of solar radiation back to space. This reduces the total amount of energy  available to the system. Clouds also act as blankets to the thermal radiation from the Earth’s  surface. These two effects cause them to reduce heat loss to space by the surface. However,  for low clouds the reflectivity effect is stronger, causing them to cool the Earth-atmosphere  system. Evaporation from the ocean provides the main source of atmospheric water vapour  which provides the largest single heat source for the atmospheric.  Ice or snow surface is a powerful reflector of solar radiation. When some ice melts at the 
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This note was uploaded on 03/30/2008 for the course MASC 051 taught by Professor Alperin during the Spring '08 term at UNC.

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homework6 - Global Warming Chapter 5 Questions Alyssa...

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