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| Titel |
Dynamical characteristics of ice supersaturated regions |
| VerfasserIn |
K. Gierens, S. Brinkop |
| 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 ; 12, no. 24 ; Nr. 12, no. 24 (2012-12-17), S.11933-11942 |
| Datensatznummer |
250011671
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| Publikation (Nr.) |
 copernicus.org/acp-12-11933-2012.pdf |
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| Zusammenfassung |
| The typical distributions of dynamical fields within ice supersaturated
regions are investigated. The dynamical fields divergence, relative
vorticity, and vertical velocity are analysed statistically in two ways,
namely using the unconditioned data and data conditioned on the presence of
ice supersaturation. Two geographical regions are considered, namely Europe
(250 hPa level) and the tropical belt from 30° S to 30° N on
two pressure levels (200 and 150 hPa). The study is based on forecast data
from the European Centre for Medium-Range Weather Forecasts for four
months covering the four seasons, June, September, December 2011 and
March 2012. We find that histograms (frequency distributions) and low order
moments of the dynamical fields differ substantially and statistically
significantly inside and outside of ice supersaturated regions. As expected,
upward and divergent flow favours ice supersaturation. But we find also that
ice supersaturation is mostly located in anti-cyclonic flow. The latter
result is probably due to the structure of warm/moist and cold/dry air
streams in synoptic disturbances in mid-latitudes, but probably merely
coincidental in the tropical belt. |
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