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| Titel |
Comparison of UV-RSS spectral measurements and TUV model runs for clear skies for the May 2003 ARM aerosol intensive observation period |
| VerfasserIn |
J. J. Michalsky, P. W. Kiedron |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 6 ; Nr. 8, no. 6 (2008-03-26), S.1813-1821 |
| Datensatznummer |
250005941
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| Publikation (Nr.) |
 copernicus.org/acp-8-1813-2008.pdf |
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| Zusammenfassung |
| The first successful deployment of the fully-operational ultraviolet
rotating shadow-band spectroradiometer occurred during the May 2003 US
Department of Energy's Atmospheric Radiation Measurement program's Aerosol
Intensive Observation Period. The aerosol properties in the visible range
were characterized using redundant measurements with several instruments to
determine the column aerosol optical depth, the single scattering albedo,
and the asymmetry parameter needed as input for radiative transfer
calculations of the downwelling direct normal and diffuse horizontal solar
irradiance in clear-sky conditions. The Tropospheric Ultraviolet and Visible
(TUV) radiative transfer model developed by Madronich and his colleagues at
the US National Center for Atmospheric Research was used for the
calculations of the spectral irradiance between 300–360 nm. Since there are
few ultraviolet measurements of aerosol properties, most of the input
aerosol data for the radiative transfer model are based on the assumption
that UV input parameters can be extrapolated from the visible portion of the
spectrum. Disagreements among available extraterrestrial spectra, which
are discussed briefly, suggested that instead of comparing irradiances,
measured and modeled spectral transmittances between 300–360 nm
should be compared for the seven cases studied. Transmittance was
calculated by taking the ratios of the measured irradiances to the
Langley-derived, top-of-the-atmosphere irradiances. The cases studied
included low to moderate aerosol loads and low to high solar-zenith angles.
A procedure for retrieving single scattering albedo in the ultraviolet based
on the comparisons of direct and diffuse transmittance is outlined. |
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