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| Titel |
Ultrathin Tropical Tropopause Clouds (UTTCs): I. Cloud morphology and occurrence |
| VerfasserIn |
Th. Peter, B. P. Luo, M. Wirth, C. Kiemle, H. Flentje, V. A. Yushkov, V. Khattatov, V. Rudakov, A. Thomas, S. Borrmann, G. Toci, P. Mazzinghi, J. Beuermann, C. Schiller, F. Cairo, G. Donfrancesco, A. Adriani, C. M. Volk, J. Ström, K. Noone, V. Mitev, R. A. MacKenzie, K. S. Carslaw, T. Trautmann, V. Santacesaria, L. Stefanutti |
| 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 ; 3, no. 4 ; Nr. 3, no. 4 (2003-07-29), S.1083-1091 |
| Datensatznummer |
250001140
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| Publikation (Nr.) |
 copernicus.org/acp-3-1083-2003.pdf |
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| Zusammenfassung |
| Subvisible cirrus clouds
(SVCs) may contribute to dehydration close to the tropical tropopause. The higher and colder SVCs and the larger their ice crystals, the more likely they
represent the last efficient point of contact of the gas phase with the ice phase and, hence, the
last dehydrating step, before the air enters the stratosphere. The first simultaneous in situ and
remote sensing measurements of SVCs were taken during the APE-THESEO campaign in the
western Indian ocean in February/March 1999. The observed clouds, termed Ultrathin
Tropical Tropopause Clouds (UTTCs), belong to the geometrically and optically thinnest
large-scale clouds in the Earth's atmosphere. Individual UTTCs may exist for many hours as an
only 200--300 m thick cloud layer just a few hundred meters below the tropical cold point
tropopause, covering up to 105 km2. With temperatures as low as
181 K these clouds are prime representatives for defining the water mixing ratio of air entering the lower stratosphere. |
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