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6246lect04_S10

6246lect04_S10 - Advanced Environmental Geochemistry GLY...

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Advanced Environmental Geochemistry, GLY 6246, ©David Warburton, 2010 1 LECTURE 4 - Details of the Hydrologic Cycle and the Concept of Residence Time Water is distributed in many reservoirs in the hydrosphere, atmosphere, and lithosphere. Estimates of the contents of each reservoir are available. Geochemists are interested not only in the distribution of water but also in the circulation of that water between reservoirs. Flux rates (the rate of transfer of water from one reservoir to another) may also be estimated. These rates are of great interest because of their implications for the transfer of energy and substances dissolved in the water. Lect04, slide 2 here Table 4-1 gives a list of many reservoirs with stored mass and percent of the total water. This compilation neglects all water below four thousand meters as inaccessible. Another way of stating this is to say that water below four kilometers is part of the very long cycle and that we are interested only in the short and long cycles. The table is given in geograms (Gg) to facilitate comparison with Table 1-1. Most figures compare well but the figure for lakes in Table 4-1 is about five times higher than that in Table 1-1.
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