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| Titel |
Modeling the radiative effects of desert dust on weather and regional climate |
| VerfasserIn |
C. Spyrou, G. Kallos, C. Mitsakou, P. Athanasiadis, C. Kalogeri, M. J. Iacono |
| 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 ; 13, no. 11 ; Nr. 13, no. 11 (2013-06-04), S.5489-5504 |
| Datensatznummer |
250018684
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| Publikation (Nr.) |
 copernicus.org/acp-13-5489-2013.pdf |
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| Zusammenfassung |
Mineral dust aerosols exert a significant effect on both solar and
terrestrial radiation. By absorbing and scattering, the solar radiation
aerosols reduce the amount of energy reaching the surface. In addition,
aerosols enhance the greenhouse effect by absorbing and emitting outgoing
longwave radiation. Desert dust forcing exhibits large regional and temporal
variability due to its short lifetime and diverse optical properties,
further complicating the quantification of the direct radiative effect
(DRE). The complexity of the links and feedbacks of dust on radiative
transfer indicate the need for an integrated approach in order to examine
these impacts.
In order to examine these feedbacks, the SKIRON limited area model has been
upgraded to include the RRTMG (Rapid Radiative Transfer Model – GCM)
radiative transfer model that takes into consideration the aerosol radiative
effects. It was run for a 6 year period. Two sets of simulations were
performed, one without the effects of dust and the other including the
radiative feedback. The results were first evaluated using aerosol optical
depth data to examine the capabilities of the system in describing the
desert dust cycle. Then the aerosol feedback on radiative transfer was
quantified and the links between dust and radiation were studied.
The study has revealed a strong interaction between dust particles and solar
and terrestrial radiation, with several implications on the energy budget of
the atmosphere. A profound effect is the increased absorption (in the
shortwave and longwave) in the lower troposphere and the induced
modification of the atmospheric temperature profile. These feedbacks depend
strongly on the spatial distribution of dust and have more profound effects
where the number of particles is greater, such as near their source. |
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