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| Titel |
Longwave indirect effect of mineral dusts on ice clouds |
| VerfasserIn |
Q. Min, R. Li |
| 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 ; 10, no. 16 ; Nr. 10, no. 16 (2010-08-23), S.7753-7761 |
| Datensatznummer |
250008718
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| Publikation (Nr.) |
 copernicus.org/acp-10-7753-2010.pdf |
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| Zusammenfassung |
| In addition to microphysical changes in clouds, changes in nucleation
processes of ice cloud due to aerosols would result in substantial changes
in cloud top temperature as mildly supercooled clouds are glaciated through
heterogenous nucleation processes. Measurements from multiple sensors on
multiple observing platforms over the Atlantic Ocean show that the cloud
effective temperature increases with mineral dust loading with a slope of
+3.06 °C per unit aerosol optical depth. The macrophysical changes in ice
cloud top distributions as a consequence of mineral dust-cloud interaction
exert a strong cooling effect (up to 16 Wm−2) of thermal infrared
radiation on cloud systems. Induced changes of ice particle size by mineral
dusts influence cloud emissivity and play a minor role in modulating the
outgoing longwave radiation for optically thin ice clouds. Such a strong
cooling forcing of thermal infrared radiation would have significant impacts
on cloud systems and subsequently on climate. |
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