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

Zinner, Tobias and Wind, Gala and Platnick, Steven and 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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Official URL: http://www.eumetsat.int/Home/Main/Publications/Conference_and_Workshop_Proceedings/SP_1228987324620?l=en

Abstract

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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Impact of drizzle and 3D cloud structure on remote sensing of cloud effective radius
Authors:
AuthorsInstitution or Email of Authors
Zinner, TobiasUNSPECIFIED
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
Date:September 2008
Journal or Publication Title:EUMETSAT Meteorological Satellite Conference 2008
Refereed publication:No
In ISI Web of Science:No
Volume:P.52
Publisher:EUMETSAT
ISSN:1011-3932
ISBN:978-92-9110-082-8
Status:Published
Keywords:LES, cloud, radiative transfer, MODIS
Event Title:EUMETSAT Meteorological Satellite Conference
Event Location:Darmstadt
Event Type:international Conference
Event Dates:2008-09-08 - 2008-09-12
Organizer:EUMETSAT
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Dr.rer.nat. Tobias Zinner
Deposited On:16 Dec 2008
Last Modified:12 Dec 2013 20:33

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