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United States Department of Agriculture

Agricultural Research Service

Research Project: Leveraging Remote Sensing, Land Surface Modeling and Ground-based Observations ... Variables within Heterogeneous Agricultural Landscapes

Location: Hydrology and Remote Sensing Laboratory

Title: Soil Evaporation

Authors
item Kustas, William
item Agam, N

Submitted to: Review Article
Publication Type: Review Article
Publication Acceptance Date: September 25, 2012
Publication Date: January 20, 2014
Citation: Kustas, W.P., Agam, N., Soil evaporation. Encyclopedia of Natural Resources. DOI: 10.1081/E-ENRL-120049129.

Technical Abstract: Soil evaporation can significantly influence energy flux partitioning of partially vegetated surfaces, ultimately affecting plant transpiration. While important, quantification of soil evaporation, separately from canopy transpiration, is challenging. Techniques for measuring soil evaporation exist and continually improve. The large variability in soil water content requires that there be careful thought to the design of soil evaporation measurements in the field. Numerical models for simulating soil evaporation have been developed and are shown to be fairly robust. However, the required inputs for defining model parameters often limit their application. For many operational applications where detailed soils and ancillary weather data are unavailable or where daily evaporation values are only needed, some of the analytical models described may provide the necessary level of accuracy. Moreover, in the application of weather forecast and hydrologic models, the use of simplified approaches is necessitated by the computational requirements and/or the lack of adequate data for defining more complex numerical model inputs. For large area estimation, the use of remotely sensed soil moisture and surface temperature offer the greatest potential for operational applications.

Last Modified: 11/22/2014
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