Using Daily Stand-Scale Evapotranspiration (ET) Estimated From Remotely Sensed Data to Investigate Drought Impact on ET in a Temporate Forest in the Central Us

Forests provide many important service functions, including habitat for wildlife, timber production and watershed water regulation. Short-term drought can make forests more susceptible to wildfire and insect attack, while long-term drought can directly increase forest mortality. Evapotranspiration (ET) is a key parameter that links the hydrological and ecological processes. Studying the impact of drought on ET, especially at stand-scale, can provide useful information for forest management. In this study, we applied a multi-scale data fusion ET modeling method using remotely sensed data to estimate daily 30 m ET over a natural forest in central US from 2010 to 2012, with 2012 as an extreme drought year. The estimated ET agrees well with the observed ET. Drought impact on ET is further analyzed and demonstrates the value of remotely sensed ET in studying drought impact on forest water use.

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