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Cooperative Institute for Research in Environmental Sciences <br />UNIVERSITY OF COLORADO BOULDER and NOAA <br />Background <br />Variety of metrics for E0 <br />OBSERVED: physically <br />integrates all above drivers •pan evaporation <br /> <br />•potential evaporation (PET) <br /> <br /> <br /> <br />•reference crop ET, ET0 <br /> <br />complete physics: <br />o SW radiation <br />o LW radiation <br />o air temperature <br />o humidity <br />o wind speed <br />o atmospheric pressure <br />temperature-based: <br />o air temperature <br />o Tmax <br />o Tmin <br />ESTIMATED: from WX obs, <br />R/S data, or reanalyses