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| Titel |
Diurnal cycle of the dust instantaneous direct radiative forcing over the Arabian Peninsula |
| VerfasserIn |
S. Osipov, G. Stenchikov, H. Brindley, J. Banks |
| 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 ; 15, no. 16 ; Nr. 15, no. 16 (2015-08-27), S.9537-9553 |
| Datensatznummer |
250119994
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| Publikation (Nr.) |
 copernicus.org/acp-15-9537-2015.pdf |
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| Zusammenfassung |
| In this study we attempted to better quantify radiative effects of
dust over the Arabian Peninsula and their dependence on input parameters.
For this purpose we have developed a stand-alone column radiation transport
model coupled with the Mie, T-matrix and geometric optics calculations
and driven by reanalysis meteorological fields and atmospheric composition.
Numerical experiments were carried out for a wide range of aerosol
optical depths, including extreme values developed during the dust
storm on 18–20 March 2012. Comprehensive ground-based observations
and satellite retrievals were used to estimate aerosol optical properties,
validate calculations and carry out radiation closure. The broadband
surface albedo, fluxes at the bottom and top of the atmosphere as
well as instantaneous dust radiative forcing were estimated both from
the model and observations. Diurnal cycle of the shortwave instantaneous
dust direct radiative forcing was studied for a range of aerosol and
surface characteristics representative of the Arabian Peninsula.
Mechanisms and parameters responsible for diurnal variability of the
radiative forcing were evaluated. We found that intrinsic variability
of the surface albedo and its dependence on atmospheric conditions,
along with anisotropic aerosol scattering, are mostly responsible
for diurnal effects. |
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