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| Titel |
The impact of cirrus clouds on tropical troposphere-to-stratosphere transport |
| VerfasserIn |
T. Corti, B. P. Luo, Q. Fu, H. Vömel, T. Peter |
| 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 ; 6, no. 9 ; Nr. 6, no. 9 (2006-07-03), S.2539-2547 |
| Datensatznummer |
250003977
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| Publikation (Nr.) |
 copernicus.org/acp-6-2539-2006.pdf |
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| Zusammenfassung |
| Although it is well known that air enters the stratosphere
preferentially through upwelling in the tropics, the exact
mechanisms of troposphere-to-stratosphere transport (TST) are
still unknown. Previously proposed mechanisms have been found
either to be too slow (e.g., clear sky upwelling) to provide
agreement with in situ tracer measurements, or to be insufficient
in mass flux to act as a major supply for the Brewer-Dobson
circulation (e.g., convective overshooting).
In this study we evaluate whether the lofting of air via cirrus
cloud-radiation interaction might offer an alternative path for
TST, which is responsible for a significant fraction of the
observed air mass transport. We find that a combination of deep
convection and subsequent upwelling associated with cirrus clouds
and clear sky can explain the supply of air for the Brewer-Dobson
circulation. Thus, upwelling associated with cirrus clouds offers
a mechanism for the missing second stage, which links the first
stage of TST, deep convection, to the third stage, the
Brewer-Dobson circulation. |
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