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| Titel |
The role of tropical deep convective clouds on temperature, water vapor, and dehydration in the tropical tropopause layer (TTL) |
| VerfasserIn |
J. H. Chae, D. L. Wu, W. G. Read, S. C. Sherwood |
| 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 ; 11, no. 8 ; Nr. 11, no. 8 (2011-04-27), S.3811-3821 |
| Datensatznummer |
250009651
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| Publikation (Nr.) |
 copernicus.org/acp-11-3811-2011.pdf |
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| Zusammenfassung |
| Temperature and water vapor variations due to clouds in the tropical
tropopause layer (TTL) are investigated using co-located MLS, CALIPSO, and
CloudSat data. Convective cooling occurs only up to the cloud tops, with
warming above these heights in the TTL. Water vapor and ozone anomalies
above the cloud tops are consistent with the warming being due to downward
motion. Thicker clouds are associated with larger anomalies. Environmental
water vapor below cloud tops can be either higher or lower than when clouds
are absent, depending on the cloud top height. The critical factor
determining the sign of this change appears to be the relative humidity. In
general cloud-forming processes hydrate the environment below 16 km, where
the air after mixing between cloud and the environmental air does not reach
saturation, but clouds dehydrate above 16 km, as the larger temperature drop
and the high initial relative humidity cause supersaturation to occur.
Negative water vapor anomalies above cloud tops compared to clear skies
suggest another dehydration mechanism operating above the detected cloud
layers. |
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