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Cloud microphysics retrieval in highly three-dimensional situations

Zinner, Tobias and Marshak, Alexander and Martins, Vanderlei and Lang, Steven (2007) Cloud microphysics retrieval in highly three-dimensional situations. 24th IUGG General Assembly, Perugia, (I). (Unpublished)

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Abstract

The CLAIM-3D (cloud aerosol interaction mission in 3-D) passive cloud side viewing sensor concept is planned to become a new means of measuring the vertical profile of cloud microphysical properties, e.g., from airborne perspective or eventually from a satellite platform. Inherent to the complex viewing and illumination geometry and the fact that such a profile has to be derived on high spatial resolution is the need for the consideration of 3D radiative transport. Based on a large number of realistic deep convection cloud scenes from a 3D cloud resolving model (Goddard Cumulus Ensemble model) a data base of related observable radiances is generated, using a 3D Monte Carlo radiative transfer model (MYSTIC). Presented are the technical optimizations and the necessary trade-offs between Monte Carlo model accuracy and computational speed in order to facilitate the generation of a large data base of simulated observations in channels in the visible, NIR and IR spectral range. This data set is then used to explore the limitations of a conventional plane-parallel approach to the cloud side remote sensing of profiles of cloud phase and effective particle size. Furthermore it is demonstrated how the data base can as well serve as the basis for a Bayesian retrieval algorithm of the same properties which is accounting for the uncertainty due to 3D radiative effects and the variability of the cloud particle population

Document Type:Conference or Workshop Item (Speech)
Title:Cloud microphysics retrieval in highly three-dimensional situations
Authors:
AuthorsInstitution or Email of Authors
Zinner, TobiasUNSPECIFIED
Marshak, AlexanderNASA, Greenbelt, MD, USA
Martins, VanderleiUniv. of Maryland, Baltimore County, MD, USA
Lang, StevenSSAI/NASA, Greenbelt, MD, USA
Date:July 2007
Status:Unpublished
Keywords:3D radiative transport, remote sensing, cloud phase, effective radius, Bayesian retrieval
Event Title:24th IUGG General Assembly
Event Location:Perugia, (I)
Event Type:international Conference
Organizer:International Union of Geodesy and Geophysics
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 - Projekt Partikel und Zirren II (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Dr.rer.nat. Tobias Zinner
Deposited On:16 Jul 2007
Last Modified:27 Apr 2009 14:05

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