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| Titel |
A numerical study of tropical cross-tropopause transport by convective overshoots |
| VerfasserIn |
J.-P. Chaboureau, J.-P. Cammas, J. Duron, P. J. Mascart, N. M. Sitnikov, H.-J. Voessing |
| 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. 7 ; Nr. 7, no. 7 (2007-04-10), S.1731-1740 |
| Datensatznummer |
250004877
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| Publikation (Nr.) |
 copernicus.org/acp-7-1731-2007.pdf |
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| Zusammenfassung |
| Observations obtained during the Tropical Convection, Cirrus and Nitrogen
Oxides (TROCCINOX) golden day have revealed the presence of ice particles up
to 410 K (18.2 km) 2 km above the local tropopause. The
case was investigated using a three-dimensional quadruply nested
non-hydrostatic simulation and Meteosat Second Generation (MSG) observations.
The simulation reproduced the measurements along the flight
track fairly well. A reasonable agreement with MSG observations was also achieved: the
10.8-μm brightness temperature (BT) minimum of 187 K was
reproduced (a value 6 K colder than the environmental cold-point
temperature) as was the positive BT difference between the 6.2- and
10.8-μm bands, an overshoot signature. The simulation produced
several overshooting plumes up to 410 K yielding an upward transport
of water vapour of a few tons per second across the tropical tropopause. The
estimated mass flux agrees with those derived from over tracer budgets,
indicating that convection transports mass across the tropopause. |
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