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Advective influences on the reduction of evapotranspiration in a coastal environment
Author(s) -
Nixon P. R.,
Lawless G. P.
Publication year - 1968
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr004i001p00039
Subject(s) - evapotranspiration , advection , sink (geography) , environmental science , overcast , hydrology (agriculture) , atmospheric sciences , energy balance , meteorology , geology , geography , ecology , physics , geotechnical engineering , biology , thermodynamics , cartography , sky
Incoming air from an ocean may either supply heat to a land area or serve as an energy sink. A marked example of the energy sink phenomenon occurs in a coastal valley of California. Advective cooling resulted in much lower evapotranspiration than amounts reported for interior locations during the two months studied, July and September. Evapotranspiration from irrigated ryegrass was equivalent to about 2/3 of net radiation on clear days. This ratio is lower than the 8/10 or 9/10 commonly observed in humid interior areas and is much lower than amounts reported for interior desert conditions. Overcast days having low net radiation did not produce amounts of evapotranspiration that were proportionally as low. This observation indicated that there was a trade off beween radiation and advection under these coastal conditions where a critical balance existed between air and surface temperatures.