Lecture 17 - GEOS 1004 SPOTILA/5/09 PART IV THE EARTH'S...

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GEOS 1004, SPOTILA Lecture 17, 11/5/09 PART IV THE EARTH'S SURFACE, GLOBAL CHANGE Hydrologic cycle The recycling or exchange of water through different reservoirs . What are the reservoirs, and how big are they? (Oceans 95.5%, glaciers 3%, ground water 1.05%, surface water .009%, atmosphere .001%, biosphere <.001%) 1) Oceans 95.5% 2) Glaciers 3% 3) Ground Water 1.05% 4) Surface Water .009% 5) Atmosphere .001% 6) Bioshpere <.001% Why is most water liquid on earth? Distance from sun and pressure. Modes of exchange among reservoirs: 1) Evaporation 2) Transpiration (exchange from biosphere to atmosphere) 3) Precipitation 4) Run-off 5) Groundwater Flow 6) Infiltration 7) Melting 8) Freezing The hydrologic cycle is not creation or destruction of water; just recycling. Total volume of water is constant. Significant water is not added to the earth (or lost) from space. There is no water coming up from deep inside the earth and the amount gained through meteorite impacts is trivial. Are the reservoir sizes constant through time? No. (The Ice Age) Over short periods they are constant, but not over long periods Rates of exchange (flux) are generally balanced over short periods. So over short periods, reservoir volume is constant. But over long periods, flux rates change and reservoir volumes change. For example?
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This note was uploaded on 09/11/2011 for the course GEOG 1004 at Virginia Tech.

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Lecture 17 - GEOS 1004 SPOTILA/5/09 PART IV THE EARTH'S...

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