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Impact of drizzle and 3D cloud structure on remote sensing of cloud effective radius

Zinner, Tobias und Wind, Gala und Platnick, Steven und Ackerman, Andy (2008) Impact of drizzle and 3D cloud structure on remote sensing of cloud effective radius. In: EUMETSAT Meteorological Satellite Conference 2008, P.52. EUMETSAT. EUMETSAT Meteorological Satellite Conference, 2008-09-08 - 2008-09-12, Darmstadt. ISBN 978-92-9110-082-8. ISSN 1011-3932

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Offizielle URL: http://www.eumetsat.int/Home/Main/Publications/Conference_and_Workshop_Proceedings/SP_1228987324620?l=en

Kurzfassung

Remote sensing of cloud particle size with passive sensors like MODIS is an important tool for cloud microphysical studies. As a measure of the radiatively relevant droplet size, effective radius can be retrieved with different combinations of visible through shortwave infrared channels. The resulting effective radii are often quite different, indicative of different penetration depths for the spectral radiances used. Operational liquid water cloud retrievals are based on the assumption of a relatively narrow distribution of droplet sizes; the potential impact of precipitation on these distributions is neglected. MODIS observations sometimes show significantly larger effective radii in marine boundary layer fields derived from the 1.6 and 2.1 μm channel observations than for 3.7 μm retrievals. Possible explanations range from 3D radiative transport effects and sub-pixel cloud inhomogeneity aspects to the impact of drizzle formation. To investigate possible factors of influence, we use LES simulated boundary layer cloud situations in combination with 3D Monte Carlo simulations of MODIS observations. LES simulations of warm cloud spectral microphysics for cases of marine stratus and broken cumulus produce cloud structures comprising droplet size distributions with and without drizzle size drops. From 3D radiative transport simulations considering individual droplet size distributions synthetic MODIS observations are obtained. On these scenes the operational MODIS effective radius retrievals are applied and the results are compared to the given LES microphysics.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Impact of drizzle and 3D cloud structure on remote sensing of cloud effective radius
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Zinner, TobiasNICHT SPEZIFIZIERT
Wind, GalaNASA Goddard Space Flight Center, Greenbelt, MD, USA
Platnick, StevenNASA Goddard Space Flight Center, Greenbelt, MD, USA
Ackerman, AndyNASA Goddard Inst. for Space Studies, New York, NY, USA
Datum:September 2008
Erschienen in:EUMETSAT Meteorological Satellite Conference 2008
Referierte Publikation:Nein
In ISI Web of Science:Nein
Band:P.52
Verlag:EUMETSAT
ISSN:1011-3932
ISBN:978-92-9110-082-8
Status:veröffentlicht
Stichwörter:LES, cloud, radiative transfer, MODIS
Veranstaltungstitel:EUMETSAT Meteorological Satellite Conference
Veranstaltungsort:Darmstadt
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2008-09-08 - 2008-09-12
Veranstalter :EUMETSAT
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Atmosphären- und Klimaforschung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Fernerkundung der Atmosphäre
Hinterlegt von: Dr.rer.nat. Tobias Zinner
Hinterlegt am:16 Dez 2008
Letzte Änderung:12 Dez 2013 20:33

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