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| Titel |
The effects of heating by transported dust layers on cloud and precipitation: a numerical study |
| VerfasserIn |
Y. Yin, L. Chen |
| 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 ; 7, no. 13 ; Nr. 7, no. 13 (2007-07-03), S.3497-3505 |
| Datensatznummer |
250005119
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| Publikation (Nr.) |
 copernicus.org/acp-7-3497-2007.pdf |
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| Zusammenfassung |
| There have been numerous recent publications showing that mineral dust might
be a good absorber for solar radiation in addition to its capability to act
as cloud condensation nuclei (CCN) and ice forming nuclei (IFN), and could
lead to reduced cloud cover and precipitation in the region where it is
present. This effect is investigated using a dynamic cloud model with
detailed microphysics of both warm and ice phase processes. The model is
initialized using measured size distributions and concentrations of mineral
dust particles. Our results show that when dust appears at the cloud-base
height and below 3 km, where the temperature is warmer than −5°C, the
heating induced by the presence of dust layers can inhibit the formation of
cloud droplets and suppresses the development of precipitation, leading to
lower cloud optical depth and albedo. On the other hand, when the dust
layers are located at altitudes with temperature colder than −5°C, or
above the −5°C level, mineral aerosols can act as effective ice nuclei,
intensify the ice-forming processes, and may enhance the development of
cloud and precipitation. It is also found that the heating effect is more
pronounced in continental clouds than in maritime clouds. |
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