GEOG 322 Lecture 5: Lecture 5 Evapotranspiration 1
14 Feb 2020
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Et completes the hydrological cycle all water in the atmosphere comes from evapotranspiration. If its warm and there is wind water molecules cause energy to escape. No net evapotranspiration = saturated air (max the air can hold of water) Vpd= the difference between moisture the air can hold and what it takes for the air to be saturated. Es = saturation vapor pressure at air temperature. If you know rh can get actual vapor pressure. Saturation vapor pressure is a function of temperature and not rh. Relative humidity evapotranspiration is a function of the ability of air to hold water, based on air temperature and rh. Use the difference between two temperatures to find rh. When using these equations units have to be in the units it requires you to be in. In the winter net radiation out of snow pack allot of radiation is reflected away. As a net radiation is out starts to go back out.
