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| Titel |
Vertical transport of pollutants by shallow cumuli from large eddy simulations |
| VerfasserIn |
G. Chen, H. Xue, G. Feingold, X. Zhou |
| 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 ; 12, no. 23 ; Nr. 12, no. 23 (2012-12-03), S.11319-11327 |
| Datensatznummer |
250011632
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| Publikation (Nr.) |
 copernicus.org/acp-12-11319-2012.pdf |
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| Zusammenfassung |
| This study investigates the vertical transport of a passive tracer in a
shallow cumulus boundary layer using large eddy simulations. The tracer
source is at the surface in one case, and in the inversion layer in the
other case. Results show that shallow cumulus clouds can significantly
enhance vertical transport of the tracer in both cases. In the case with
surface-borne pollutants, cloudy regions are responsible for the upward
transport, due to the intense updrafts in cumulus clouds. In the case where
pollutants are aloft, cloud-free regions are responsible for the downward
transport, but the downward transport mainly occurs in thin regions around
cloud edges. This is consistent with previous aircraft measurements of
downdrafts around cumulus clouds and indicates that the downward transport
is also cloud-induced. Cumulus convection is therefore able to both vent
pollutants upward from the surface and fumigate pollutants in the inversion
layer downward into the lower boundary layer. |
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