Wednesday, November 10, 2010

Hydrological Cycle (Feedback)

                First Phase
1.      As Surface temperature increase its increase the evaporation (+ve feedback)
2.      As evaporation increase its decrease the surface temperature (-ve feedback)
3.      As evaporation increase, water vapour in the atmosphere also increase ( +ve feedback)
4.      With increase in water vapour in atmosphere, surface temperature also increase. (+ve feedback)

Second Phase
5.      Water vapour increase, relative humidity also increase (+ve feedback)
6.      Relative humidity lead to increase cloud cover (+ve feedback)
7.      But due to condensation increase in cloud cover reduce water content in the atmosphere (-ve feedback)
8.      Surface temperature decrease with increase in relative humidity (-ve feedback)

Third Phase
9.      Greater cloud cover mean low radiation (-ve feedback)
10.  Also greater cloud cover leads to low incoming solar radiation (-ve feedback)
11.  High radiation means high surface temperature(+ve feedback)
12.  But high outgoing radiation reduce surface temperature (-ve feedback)
13.  On the other hand high incoming radiation increase surface temperature (+ve feedback)
                                                                                                                                                                Source: Guy Schurger lecture

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