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| Titel |
Cirrus, contrails, and ice supersaturated regions in high pressure systems at northern mid latitudes |
| VerfasserIn |
F. Immler, R. Treffeisen, D. Engelbart, K. Krüger, O. Schrems |
| 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 ; 8, no. 6 ; Nr. 8, no. 6 (2008-03-20), S.1689-1699 |
| Datensatznummer |
250005933
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| Publikation (Nr.) |
 copernicus.org/acp-8-1689-2008.pdf |
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| Zusammenfassung |
| During the European heat wave summer 2003 with predominant high pressure
conditions we performed a detailed study of upper tropospheric humidity and
ice particles which yielded striking results concerning the occurrence of ice
supersaturated regions (ISSR), cirrus, and contrails. Our study is based on
lidar observations and meteorological data obtained at Lindenberg/Germany
(52.2° N, 14.1° E) as well as the analysis of the
European centre for medium range weather forecast (ECMWF). Cirrus clouds were
detected in 55% of the lidar profiles and a large fraction of them were
subvisible (optical depth <0.03). Thin ice clouds were particularly
ubiquitous in high pressure systems. The radiosonde data showed that the
upper troposphere was very often supersaturated with respect to ice. Relating
the radiosonde profiles to concurrent lidar observations reveals that the
ISSRs almost always contained ice particles. Persistent contrails observed
with a camera were frequently embedded in these thin or subvisible cirrus
clouds. The ECMWF cloud parametrisation reproduces the observed cirrus clouds
consistently and a close correlation between the ice water path in the model
and the measured optical depth of cirrus is demonstrated. |
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