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Approximate models for broken clouds in stochastic radiative transfer theory

Doicu, Adrian and Efremenko, Dmitry and Loyola, Diego and Trautmann, Thomas (2014) Approximate models for broken clouds in stochastic radiative transfer theory. Journal of Quantitative Spectroscopy and Radiative Transfer, 145, pp. 74-87. Elsevier. doi: 10.1016/j.jqsrt.2014.04.025. ISSN 0022-4073.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0022407314001964


This paper presents approximate models in stochastic radiative transfer theory. The independent column approximation and its modified version with a solar source computed in a full three-dimensional atmosphere are formulated in a stochastic framework and for arbitrary cloud statistics. The nth-order stochastic models describing the independent column approximations are equivalent to the nth-order stochastic models for the original radiance fields in which the gradient vectors are neglected. Fast approximate models are further derived on the basis of zeroth-order stochastic models and the independent column approximation. The so-called “internal mixing” models assume a combination of the optical properties of the cloud and the clear sky, while the “external mixing” models assume a combination of the radiances corresponding to completely overcast and clear skies. A consistent treatment of internal and external mixing models is provided, and a new parameterization of the closure coefficient in the effective thickness approximation is given. An efficient computation of the closure coefficient for internal mixing models, using a previously derived vector stochastic model as a reference, is also presented. Equipped with appropriate look-up tables for the closure coefficient, these models can easily be integrated into operational trace gas retrieval systems that exploit absorption features in the near-IR solar spectrum.

Item URL in elib:https://elib.dlr.de/92912/
Document Type:Article
Title:Approximate models for broken clouds in stochastic radiative transfer theory
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Doicu, Adrianadrian.doicu (at) dlr.deUNSPECIFIED
Efremenko, Dmitrydmitry.efremenko (at) dlr.deUNSPECIFIED
Loyola, Diegodiego.loyola (at) dlr.deUNSPECIFIED
Trautmann, Thomasthomas.trautmann (at) dlr.deUNSPECIFIED
Date:September 2014
Journal or Publication Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jqsrt.2014.04.025
Page Range:pp. 74-87
EditorsEmailEditor's ORCID iD
Mengüç, Pinar M.Özyeğin University, Istanbul, TurkeyUNSPECIFIED
Mishchenko, Michael I.NASA-Goddard Institute for Space Studies, NY, USAUNSPECIFIED
Rothman, Laurence S.Harvard-Smithsonian Center for Astrophysics, MA, USAUNSPECIFIED
Keywords:Stochastic radiative transfer; Independent column approximation; Broken clouds
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Vorhaben Informationstechnische Systeme für die Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Efremenko, Dr Dmitry
Deposited On:01 Dec 2014 15:03
Last Modified:06 Sep 2019 15:28

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