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GEOPHYSICAL RESEARCH LETTERS,
VOL. 27, NO. 1,
PP. 137-140, 2000
doi:10.1029/1999GL011085
The discrepancy between measured and modeled downwelling solar irradiance at the ground: Dependence on water vapor
Earth Science Division, NASA Ames Research Center, Moffett Field, CA
Earth Science Division, NASA Ames Research Center, Moffett Field, CA
Bay Area Environmental Research Institute, San Francisco, CA
Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, Boston, MA
Bay Area Environmental Research Institute, San Francisco, CA
Earth Science Division, NASA Ames Research Center, Moffett Field, CA
Moderate resolution spectra of the downwelling solar irradiance at the ground in north central Oklahoma were measured during the Department of Energy Atmospheric Radiation Measurement Program Intensive Observation Period in the fall of 1997. Spectra obtained under cloud‐free conditions were compared with calculations using a coarse resolution radiative transfer model to examine the dependency of model‐measurement bias on water vapor. It was found that the bias was highly correlated with water vapor and increased at a rate of 9 Wm−2 per cm of water. The source of the discrepancy remains undetermined because of the complex dependencies of other variables, most notably aerosol optical depth, on water vapor.
Received 20 September 1999; accepted 26 October 1999; .
Citation: (2000), The discrepancy between measured and modeled downwelling solar irradiance at the ground: Dependence on water vapor, Geophys. Res. Lett., 27(1), 137–140, doi:10.1029/1999GL011085.
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