Evapotranspiration (ET) is the key water flux at the interface of soil, vegetation and atmosphere. In-situ measurements to estimate ET (and its individual components evaporation and transpiration) have been developed in different research disciplines and cover a range of scales, from the point scale of individual sap flow sensors in trees over pedon-scale lysimeters to eddy covariance footprints. Each estimate and each scaling step includes a method-specific set of uncertainties which are rarely communicated. This is problematic for connecting different methods and the effort to scale up to remote sensing products from satellites or to model resolutions.
This session will mainly focus on the variety of ET estimates from different in-situ devices such as lysimeters, sap flow sensors, eddy covariance stations, scintillometers, approaches like the Bowen ratio method and others, including reporting and comparing the respective uncertainties of the methods. Additionally, we want to address the scale dependency of the various approaches and the scale gap between in-situ ET data, remote sensing products and catchment- or landscape-scale modelled ET. We welcome contributions that (1) assess and compare established and new in-situ ET measurements, (2) address uncertainty in the respective methods, (3) analyse trends as well as spatial and temporal patterns in in-situ measured ET data, (4) include cross-scale comparisons and scaling approaches and (5) incorporate in-situ measurements into modeling approaches.
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