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The Discrepancy Between Measured and Modeled Downwelling Solar Irradiance at the Ground: Dependence on Water VaporModerate 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 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.
Document ID
20000052522
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Pilewski, P.
(NASA Ames Research Center Moffett Field, CA United States)
Rabbette, M.
(NASA Ames Research Center Moffett Field, CA United States)
Bergstrom, R.
(Bay Area Environmental Research Inst. San Francisco, CA United States)
Marquez, J.
(Massachusetts Inst. of Tech. Boston, MA United States)
Schmid, B.
(Bay Area Environmental Research Inst. San Francisco, CA United States)
Russell, P. B.
(NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
August 19, 2013
Publication Date
February 28, 2000
Publication Information
Publication: Analysis of Atmospheric Aerosol Data Sets and Application of Radiative Transfer Models to Compute Aerosol Effects
Subject Category
Environment Pollution
Report/Patent Number
Paper 1999GL011085
Funding Number(s)
CONTRACT_GRANT: DOE-354522-A-Q5
Distribution Limits
Public
Copyright
Other

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