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| Titel |
Relationship between cloud radiative forcing, cloud fraction and cloud albedo, and new surface-based approach for determining cloud albedo |
| VerfasserIn |
Y. Liu, W. Wu, M. P. Jensen, T. Toto |
| 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 ; 11, no. 14 ; Nr. 11, no. 14 (2011-07-21), S.7155-7170 |
| Datensatznummer |
250009938
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| Publikation (Nr.) |
 copernicus.org/acp-11-7155-2011.pdf |
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| Zusammenfassung |
| This paper focuses on three interconnected topics: (1) quantitative
relationship between surface shortwave cloud radiative forcing, cloud
fraction, and cloud albedo; (2) surface-based approach for measuring cloud
albedo; (3) multiscale (diurnal, annual and inter-annual) variations and
covariations of surface shortwave cloud radiative forcing, cloud fraction,
and cloud albedo. An analytical expression is first derived to quantify the
relationship between cloud radiative forcing, cloud fraction, and cloud
albedo. The analytical expression is then used to deduce a new approach for
inferring cloud albedo from concurrent surface-based measurements of
downwelling surface shortwave radiation and cloud fraction. High-resolution
decade-long data on cloud albedos are obtained by use of this surface-based
approach over the US Department of Energy's Atmospheric Radiaton Measurement
(ARM) Program at the Great Southern Plains (SGP) site. The surface-based
cloud albedos are further compared against those derived from the coincident
GOES satellite measurements. The three long-term (1997–2009) sets of hourly
data on shortwave cloud radiative forcing, cloud fraction and cloud albedo
collected over the SGP site are analyzed to explore the multiscale (diurnal,
annual and inter-annual) variations and covariations. The analytical
formulation is useful for diagnosing deficiencies of cloud-radiation
parameterizations in climate models. |
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