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| Titel |
Evaluation of the shortwave cloud radiative effect over the ocean by use of ship and satellite observations |
| VerfasserIn |
T. Hanschmann, H. Deneke, R. Roebeling, A. Macke |
| 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 (2012-12-21), S.12243-12253 |
| Datensatznummer |
250011690
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| Publikation (Nr.) |
 copernicus.org/acp-12-12243-2012.pdf |
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| Zusammenfassung |
| In this study the shortwave cloud radiative effect (SWCRE) over ocean
calculated by the ECHAM 5 climate model is evaluated for the cloud property
input derived from ship based measurements and satellite based estimates and
compared to ship based radiation measurements. The ship observations yield
cloud fraction, liquid water path from a microwave radiometer, cloud bottom
height as well as temperature and humidity profiles from radiosonde ascents.
Level-2 products of the Satellite Application Facility on Climate Monitoring
(CM~SAF) from the Spinning Enhanced Visible and InfraRed Imager (SEVIRI) have
been used to characterize clouds. Within a closure study six different
experiments have been defined to find the optimal set of measurements to
calculate downward shortwave radiation (DSR) and the SWCRE from the model,
and their results have been evaluated under seven different synoptic
situations. Four of these experiments are defined to investigate the
advantage of including the satellite-based cloud droplet effective radius as
additional cloud property. The modeled SWCRE based on satellite retrieved
cloud properties has a comparable accuracy to the modeled SWCRE based on ship
data. For several cases, an improvement through introducing the
satellite-based estimate of effective radius as additional information to the
ship based data was found. Due to their different measuring characteristics,
however, each dataset shows best results for different atmospheric
conditions. |
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