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| Titel |
Evaluation of Arctic cloud products from the EUMETSAT Climate Monitoring Satellite Application Facility based on CALIPSO-CALIOP observations |
| VerfasserIn |
K.-G. Karlsson, A. Dybbroe |
| 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. 4 ; Nr. 10, no. 4 (2010-02-16), S.1789-1807 |
| Datensatznummer |
250008116
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| Publikation (Nr.) |
 copernicus.org/acp-10-1789-2010.pdf |
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| Zusammenfassung |
| The performance of the three cloud products cloud fractional cover, cloud
type and cloud top height, derived from NOAA AVHRR data and produced by the
EUMETSAT Climate Monitoring Satellite Application Facility, has been
evaluated in detail over the Arctic region for four months in 2007 using
CALIPSO-CALIOP observations. The evaluation was based on 142 selected
NOAA/Metop overpasses allowing almost 400 000 individual matchups between
AVHRR pixels and CALIOP measurements distributed approximately equally over
the studied months (June, July, August and December 2007). Results suggest
that estimations of cloud amounts are very accurate during the polar summer
season while a substantial loss of detected clouds occurs in the polar
winter. Evaluation results for cloud type and cloud top products point at
specific problems related to the existence of near isothermal conditions in
the lower troposphere in the polar summer and the use of reference vertical
temperature profiles from Numerical Weather Prediction model analyses. The
latter are currently not detailed enough in describing true conditions
relevant on the pixel scale. This concerns especially the description of
near-surface temperature inversions which are often too weak leading to
large errors in interpreted cloud top heights. |
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