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Surface Measurements of Solar Spectral Radiative Flux in the Cloud-Free AtmosphereRecent studies (Charlock, et al.; Kato, et. al) have indicated a potential discrepancy between measured solar irradiance in the cloud-free atmosphere and model derived downwelling solar irradiance. These conclusions were based primarily on broadband integrated solar flux. Extinction (both absorption and scattering) phenomena, however, typically have spectral characteristics that would be present in moderate resolution (e.g., 10 nm) spectra, indicating the need for such measurements to thoroughly investigate the cause of any discrepancies. The 1996 Department of Energy Atmospheric Radiation Measurement Program (ARM) Intensive Observation Period (IOP), held simultaneously with the NASA Subsonic Aircraft: Contrail and Cloud Effects Special Study (SUCCESS) Program, provided an opportunity for two simultaneous but independent measurements of moderate resolution solar spectral downwelling irradiance at the surface. The instruments were the NASA Ames Solar Spectral Flux Radiometer and the Analytical Spectral Devices, Inc., FieldSpecT-FR. Spectral and band integrated quantities from both sets of measurements will be presented, along with estimates of the downwelling solar irradiance from band model and line by line calculations, in an effort to determine the compatibility between measured and calculated solar irradiance in the cloud-free atmosphere.
Document ID
20020039982
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Pilewskie, Peter
(NASA Ames Research Center Moffett Field, CA United States)
Goetz, A. F. H.
(NASA Ames Research Center Moffett Field, CA United States)
Bergstrom, R.
(NASA Ames Research Center Moffett Field, CA United States)
Beal, D.
(NASA Ames Research Center Moffett Field, CA United States)
Gore, Warren J. Y.
Date Acquired
August 20, 2013
Publication Date
January 1, 1997
Subject Category
Geophysics
Meeting Information
Meeting: 77th Annual Meeting of the American Meteorological Society
Location: Long Beach, CA
Country: United States
Start Date: February 2, 1997
End Date: February 4, 1997
Sponsors: American Meteorological Society
Funding Number(s)
PROJECT: RTOP 622-43-01-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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