Energy balance
; Evapotranspiration
; Geostationary satellites
; Infrared radiation
; Inverse problems
; Microwave devices
; Satellites
; Surface measurement
; Brightness temperatures
; Constellation of satellites
; Differential approach
; Land surface temperature
; Microwave radiometers
; Model implementation
; Spatial correlations
; Spatial heterogeneity
; Atmospheric temperature
英文摘要:
A newly developed microwave (MW) land surface temperature (LST) product is used to substitute thermal infrared (TIR)-based LST in the Atmosphere-Land Exchange Inverse (ALEXI) modeling framework for estimating evapotranspiration (ET) from space. ALEXI implements a two-source energy balance (TSEB) land surface scheme in a time-differential approach, designed to minimize sensitivity to absolute biases in input records of LST through the analysis of the rate of temperature change in the morning. Thermal infrared retrievals of the diurnal LST curve, traditionally from geostationary platforms, are hindered by cloud cover, reducing model coverage on any given day. This study tests the utility of diurnal temperature information retrieved from a constellation of satellites with microwave radiometers that together provide six to eight observations of Ka-band brightness temperature per location per day. This represents the first ever attempt at a global implementation of ALEXI with MW-based LST and is intended as the first step towards providing all-weather capability to the ALEXI framework.
Hydrological Sciences Lab, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Earth Science Office, NASA Marshall Space Flight Center, Huntsville, AL, United States; Hydrology and Remote Sensing Laboratory, USDA ARS, Beltsville, MD, United States
Recommended Citation:
Holmes T,R,H,et al. Microwave implementation of two-source energy balance approach for estimating evapotranspiration[J]. Hydrology and Earth System Sciences,2018-01-01,22(2)