Abstract
The sensitivity of the standardized ASCE grass-reference Penman-Monteith evapotranspiration (ASCE-PM E To ) equation to climate variables in different regions has not yet been studied. Sensitivity analyses for the standardized daily form of the ASCE-PM equation were conducted on wind speed at 2 m height ( U2 ) , maximum and minimum air temperatures ( Tmax and Tmin ), vapor pressure deficit (VPD), and solar radiation ( Rs ) in the following regions of the United States: semiarid (Scottsbluff, Nebraska, and Bushland, Texas), a Mediterranean-type climate (Santa Barbara, California), coastal humid (Fort Pierce, Florida), inland humid and semihumid (Rockport, Missouri, and Clay Center, Nebraska), and an island (Twitchell Island, California). The sensitivity coefficients were derived for each variable on a daily basis. In general, E To was most sensitive to VPD at all locations, while sensitivity of E To to the same variable showed significant variation from one location to another and at the same location with...
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