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| Titel |
First climatology of polar mesospheric clouds from GOMOS/ENVISAT stellar occultation instrument |
| VerfasserIn |
K. Pérot, A. Hauchecorne, F. Montmessin, J.-L. Bertaux, L. Blanot, F. Dalaudier, D. Fussen, E. Kyrölä |
| 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 ; 10, no. 6 ; Nr. 10, no. 6 (2010-03-23), S.2723-2735 |
| Datensatznummer |
250008252
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| Publikation (Nr.) |
 copernicus.org/acp-10-2723-2010.pdf |
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| Zusammenfassung |
| GOMOS (Global Ozone Monitoring by Occultation of Stars), on board the
European platform ENVISAT launched in 2002, is a stellar occultation
instrument combining four spectrometers and two fast photometers which
measure light at 1 kHz sampling rate in the two visible channels 470–520 nm
and 650–700 nm. On the day side, GOMOS does not measure only the light from
the star, but also the solar light scattered by the atmospheric molecules.
In the summer polar days, Polar Mesospheric Clouds (PMC) are clearly
detected using the photometers signals, as the solar light scattered by the
cloud particles in the instrument field of view. The sun-synchronous orbit
of ENVISAT allows observing PMC in both hemispheres and the stellar
occultation technique ensures a very good geometrical registration. Four
years of data, from 2002 to 2006, are analyzed up to now. GOMOS data set
consists of approximately 10 000 cloud observations all over the eight PMC
seasons studied. The first climatology obtained by the analysis of this data
set is presented, focusing on the seasonal and latitudinal coverage,
represented by global maps. GOMOS photometers allow a very sensitive PMC
detection, showing a frequency of occurrence of 100% in polar regions
during the middle of the PMC season. According to this work mesospheric
clouds seem to be more frequent in the Northern Hemisphere than in the
Southern Hemisphere. The PMC altitude distribution was also calculated. The
obtained median values are 82.7 km in the North and 83.2 km in the South. |
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