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By Pukh Raj Rakhecha, Vijay P. Singh
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Jamason, P. , 1997. Maximum and Minimum temperature trends for the globe. Science, Vol. 227, pp. 364-367. , Ding, Y. , 2001. Climate Change: The scientific basis. , Cambridge University Press, London, New York Intergovernmental Panel on Climate Change (IPCC), 2001. Climate change: The scientific basis. Cambridge University Press, London, New York. Atmospheric Processes 39 3 Atmospheric Processes Atmosphere is the most dynamic part of the terrestrial environment. It is driven by the energy received from the sun.
9% (water). Also, the land portion varies from one latitude belt to another latitude belt and from northern hemisphere to southern hemisphere. 4 shows the percent distribution of land proportion for different 5° latitudinal belts. The main points of this distribution are: (i) In the northern hemisphere, the proportion increases about 20% near the equator to about 70% in the belt of 65°-70°N latitude with a sharp decrease thereafter to zero near the north pole. (ii) In southern hemisphere, the proportion of land is 20 to 25% up to 30°S thereafter it decreases to zero by 50°S with almost no land in 50°-65°S and a sharp increase to 100% by 80-90°S.
3). That is if P be the pressure at z then P – dP the pressure at z + dz. Because of this pressure difference a pressure gradient force is operating upward on the segment. The value of this pressure gradient force per unit volume is dP/dz. 1) The Atmosphere 31 Fig. 3. Vertical column of unit cross section. 1 dP is the value of the upward force owing to the normal r dz decrease of pressure with elevation. 3) dz Evidently, the rate of change of pressure with height (dP/dz) is dependant on the acceleration due to gravity (g) multiplied by the air density (r).
Applied Hydrometeorology by Pukh Raj Rakhecha, Vijay P. Singh