Lecture Notes for ESS 110 - Hydrology and Climate at UC-Merced (UC Merced)

Notes Information

Material Type:Class Note
Class:ESS 110 - Hydrology and Climate
Subject:Earth Systems Science
University:University of California-Merced
Term:Fall Semester 2008
  • Sensible Heat
  • Temperature
  • Immediately
  • Substituting
  • Evapotranspiration
  • Differences
  • Concentration
  • Air Temperature
  • Relationship
  • Sufficient Energy
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  EnvE/ESS 110, Hydrology and Climate  1 1.  Evapotranspiration  Evapotranspiration is a collective term for all the processes by which water in liquid or solid phase at or near  the earth's land surfaces becomes atmospheric water vapor.  The term includes both evaporation (from  rivers, lakes, bare soil, and vegetative surfaces) and sublimation (from ice or snow fields).  Globally, about 62%  of the precipitation that falls on the continents is evapotranspired.  Of this, about 97% is evapotranspiration  from land surfaces and 3% open-water evaporation.  Evapotranspiration exceeds runoff in most of the river  basins on earth.    The following is a mass balance approach for determining the total volume of water that is being evaporated,  vol E , within a catchment area,    ()( ) vol in in vol out out vol vol in in out out V WSWGW ESWGW V E W SW GW SW GW V ?=? ++ ?+ + =? =++ ? ? ?? IO        (1.1)  where I  is the total quantity of water entering the catchment, O  is the total quantity ...

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