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| Titel |
Solid particles in the tropical lowest stratosphere |
| VerfasserIn |
J. K. Nielsen, N. Larsen, F. Cairo, G. Donfrancesco, J. M. Rosen, G. Durry, G. Held, J. P. Pommereau |
| 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. 3 ; Nr. 7, no. 3 (2007-02-12), S.685-695 |
| Datensatznummer |
250004558
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| Publikation (Nr.) |
 copernicus.org/acp-7-685-2007.pdf |
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| Zusammenfassung |
| We report in situ and remote observations proving occasional
occurrence of solid particles in the tropical lowest stratosphere,
200 km from deep convective events. The particles were found
during field campaigns in Southeast Brazil (49.03 W 22.36 S). They
occur in the altitude range from 17.5 to 20.8 km, at temperatures up
to at least 10 K above the expected frost point temperature. While
stability of ice particles at these altitudes is unexpected from a
theoretical point of view, it is argued that these observations are
indications of tropospheric air masses penetrating into the
stratosphere during convective overshoots. It is
argued that the intrusion of tropospheric air must have carried a
large amount of water with it, which effectively hydrated the lowest
stratosphere, and consequently suppressed sublimation. This
conclusion is further supported by a separate water vapor mixing
ratio profile obtained at the same observation site. |
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