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| Titel |
Remote sensing of water cloud droplet size distributions using the backscatter glory: a case study |
| VerfasserIn |
B. Mayer, M. Schröder, R. Preusker, L. Schüller |
| 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 ; 4, no. 5 ; Nr. 4, no. 5 (2004-08-10), S.1255-1263 |
| Datensatznummer |
250001937
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| Publikation (Nr.) |
 copernicus.org/acp-4-1255-2004.pdf |
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| Zusammenfassung |
| Cloud single scattering properties are mainly determined by
the effective radius of the droplet size distribution. There are only
few exceptions where the shape of the size distribution affects the
optical properties, in particular the rainbow and the glory
directions of the scattering phase function. Using observations by the
Compact Airborne Spectrographic Imager (CASI) in 180° backscatter
geometry, we found that high angular resolution aircraft observations
of the glory provide unique new information which is not available
from traditional remote sensing techniques: Using only one single
wavelength, 753nm, we were able to determine not only optical
thickness and effective radius, but also the width of the size
distribution at cloud top. Applying this novel technique to
the ACE-2 CLOUDYCOLUMN
experiment, we found that the size distributions were much narrower
than usually assumed in radiation calculations which is in agreement with
in-situ observations during this campaign. While the shape of the size
distribution has only little relevance for the radiative properties
of clouds, it is extremely important for understanding their formation
and evolution. |
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