GEOG 1000 Lecture Notes - Lecture 14: Evapotranspiration, Transpiration
1 Oct 2018
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Document Summary
Human activity is putting more pressure on the ecosystems within which the recycling processes related to water, carbon, nitrogen, and other nutrients. Hydrologic cycle - the processes by which water moves between its states (ice, water, vapor). Because the ocean evaporates more than it receives precipitation and the land receives more precipitation than it evaporates, a balance can be achieved with runoff water flowing from the land into the ocean. 97. 3% of water on earth is in the oceans, 2% is in ice sheets and glaciers, and 0. 6% is usable freshwater. Water budget - all of the water on the earth. Local water budget - how much water is being added through precipitation and lost through evapotranspiration, as well as surface and subsurface runoff. Evaporation occurs under two conditions: enough heat energy to overcome bonds and air that is not saturated. Occurs when plants respire water into the atmosphere.
