Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 22, Pages 11661-11670Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL070819
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Funding
- NASA New Investigator Program (NIP)
- National Science Foundation (NSF) CAREER grant [1552304]
- Department of Energy (DOE) [DE-SC0014203]
- National Science Foundation [1446798, 1247312]
- U.S. Department of Energy's Office of Science
- Directorate For Geosciences
- Division Of Earth Sciences [1552304] Funding Source: National Science Foundation
- Directorate For Geosciences
- Division Of Earth Sciences [1446798] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0014203] Funding Source: U.S. Department of Energy (DOE)
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Global estimates of evapotranspiration remain a challenge. In this study, we show that the daily course of air temperature and specific humidity available at routine weather stations can be used to estimate evapotranspiration and the evaporative fraction, the ratio of latent heat flux to available energy at the surface. Indeed, the diurnal increase in air temperature reflects the magnitude of the sensible heat flux and the increase of specific humidity after sunrise reflects the amplitude of evapotranspiration. The method is physically constrained and based on the budget of heat and moisture in the boundary layer. Unlike land surface-based estimates, the proposed boundary layer estimate does not rely on ad hoc surface resistance parameterizations (e.g., Penman-Monteith). The proposed methodology can be applied to data collected at weather stations to estimate evapotranspiration and evaporative fraction under cloudy conditions and in the pre-remote sensing era.
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