Modified Advection-Aridity Model of Evapotranspiration
نویسندگان
چکیده
The original and modified versions of the advection-aridity AA model of regional evapotranspiration are tested with data from the Solar and Meteorological Surface Observation Network SAMSON . The resulting long-term mean annual evapotranspiration estimates are validated against water balances of 25 watersheds that are minimally affected by human activity and contain at least one SAMSON station, as well as with similar closures of SAMSON-station/gridded precipitation and runoff. In general, model performance is very similar among the two versions, explaining at least 80% of the spatial variance in the long-term means, simultaneously remaining well within 10% of the water balance-based values in their station-averaged long-term mean annual evapotranspiration estimates. The modified AA model, however, can be used in humid as well as in arid regions with the same set of calibrated parameters, whereas the original AA model may require a recalibration. DOI: 10.1061/ ASCE HE.1943-5584.0000026 CE Database subject headings: Evapotranspiration; Evaporation; Surface water; Water balance. Advection-Aridity Model and its Modification Brutsaert and Stricker 1979 proposed the advection-aridity AA model of regional evapotranspiration based on Bouchet’s 1963 complementary relationship CR , which expresses actual evapotranspiration E as a combination of the wet environment Ew and potential evapotranspiration Ep , or
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