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| Titel |
Joint retrievals of cloud and drizzle in marine boundary layer clouds using ground-based radar, lidar and zenith radiances |
| VerfasserIn |
M. D. Fielding, J. C. Chiu, R. J. Hogan, G. Feingold, E. Eloranta, E. J. O'Connor, M. P. Cadeddu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 7 ; Nr. 8, no. 7 (2015-07-02), S.2663-2683 |
| Datensatznummer |
250116472
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| Publikation (Nr.) |
 copernicus.org/amt-8-2663-2015.pdf |
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| Zusammenfassung |
| Active remote sensing of marine boundary-layer clouds is challenging as
drizzle drops often dominate the observed radar reflectivity. We present a
new method to simultaneously retrieve cloud and drizzle vertical profiles in
drizzling boundary-layer clouds using surface-based observations of radar
reflectivity, lidar attenuated backscatter, and zenith radiances under
conditions when precipitation does not reach the surface. Specifically, the
vertical structure of droplet size and water content of both cloud and
drizzle is characterised throughout the cloud. An ensemble optimal
estimation approach provides full error statistics given the uncertainty in
the observations. To evaluate the new method, we first perform retrievals
using synthetic measurements from large-eddy simulation snapshots of cumulus
under stratocumulus, where cloud water path is retrieved with an error of
31 g m−2. The method also performs well in non-drizzling clouds where no
assumption of the cloud profile is required. We then apply the method to
observations of marine stratocumulus obtained during the Atmospheric
Radiation Measurement MAGIC deployment in the Northeast Pacific. Here,
retrieved cloud water path agrees well with independent three-channel microwave
radiometer retrievals, with a root mean square difference of 10–20 g m−2. |
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