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| Titel |
Measured and modeled cloud-aerosol radiative effects in polluted cumulus clouds |
| VerfasserIn |
K. S. Schmidt, G. Feingold, P. Pilewskie, H. Jiang, O. Coddington |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024882
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| Zusammenfassung |
| Recent studies have emphasized the need to consider aerosol particles and clouds as an entity rather than artificially separating aerosol and cloud radiative forcing. A particularly difficult situation is that of cumulus clouds in a polluted background where radiative effects from heterogeneous clouds, aerosol particles, and surface albedo can only be distinguished by their spectral signature. We have used spectral irradiance measurements from the Gulf of Mexico Atmospheric Composition and Climate Study, and extensive three-dimensional radiative transfer calculations applied to the output of large eddy simulations, to show that measurements below clouds or cloud gaps are only reproduced when including aerosol particles in the calculations. Our technique enables the derivation of measurement-based spectral forcing and absorption of the cloud-aerosol-system. Furthermore, we present a new spectral effect caused by a combination of molecular scattering and cumulus cloud effects that is also relevant to cloud remote sensing. |
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