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| Titel |
Mixing of stratospheric and tropospheric air-masses detected with CRISTA-NF during AMMA |
| VerfasserIn |
K. Weigel, G. Guenther, L. Hoffmann, P. Konopka, M. Riese |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250028647
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| Zusammenfassung |
| CRISTA-NF (CRyogenic Infrared Spectrometers and Telescopes for the Atmosphere - New
Frontiers) is an infrared limb sounding instrument installed onbord the high-flying research
aircraft M55-Geophysica and took part in the AMMA-SCOUT measurement campaign in
Summer 2006. During the test flight on 29th of July 2006, CRISTA-NF detected a sharp
boundary between ozone rich air over northernItaly and ozone poor air over southern
Italy and the Mediterranean Sea. The structure is also clearly visible in the HNO3
distribution. The air mass boundary extends from about 10km altitude to the thermal
tropopause at about 16km altitude with indication for mixing in the lower part of this
altitude range. This is supported by enhanced values of PAN and water vapour
found.
The observed structure is also visible in the CLaMS (Chemical Lagrangian Model of the
Stratosphere) ozone distribution but hardly resolved in ECMWF forecast data. Backward
trajectories show that the ozone rich air is originated westwards, between 40 and 60oN
while the ozone poor air is coming from the south-east, at about 0-20oN and has a
younger age of air. In the presentation details of the CRISTA-NF measurements and
retrieval procedures as well as the origin of the trace gas structures will be discussed. |
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