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Towards a Unified Treatment of Stochastic Radiative Transfer of Solar Radiation in Clouds

Trautmann, Thomas and Doicu, Adrian and Efremenko, Dmitry and Loyola, Diego (2015) Towards a Unified Treatment of Stochastic Radiative Transfer of Solar Radiation in Clouds. Joint Assembly 2015 of AGU, GAC, MAC and GCU, 3 - 7 May 2015, Montreal, Canada.

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Official URL: http://ja.agu.org/2015/


The new era of European Copernicus Sentinel nadir atmospheric sensors will provide an unprecedented high spatial resolution of about 7 km by 7 km in combination with improved radiometric sensor performance as compared to current satellite spectrometers. Thus, for trace gas retrievals it may turn out important to account for sub-pixel cloud inhomogeneity, or at least, to assess the effect of such inhomogeneities on spectral radiances at the top of the atmosphere. The radiative transfer (RT) through such inhomogeneous media can be described by stochastic RT models, in which new transport equations, relating the statistical parameters of the clouds to those of the radiance field, are derived. We present both a coherent framework for treating stochastic RT in three-, two- and one-dimensional broken cloud fields with arbitrary statistics as well as a unified treatment of closure schemes to determine the resulting covariance terms between the fluctuations of the radiance and the cloud random indicator fields. For computational purposes, the resulting stochastic model is discretized in discrete ordinate space and solved via the discrete ordinate with matrix exponential (DOME) formalism. The powerful DOME tool is used here to solve the stochastic RT equation for a bounded cascade cloud model. Our simulations represent a scenario typical for a nadir-looking UV/VIS spectrometer. In the wavelength region 325-335 nm, with Sun in the zenith and a surface albedo of 0.2, we consider a one-dimensional cloud model based on the cellular statistical model of broken clouds (Alexandrov et al., 2010). As a benchmark solution to this problem, ensemble averaged results based on two-dimensional SHDOM simulations are used. Also some ideas for the future inter-comparison of results from stochastic RT models with those from ensemble averaged conventional three- dimensional RT model data will be discussed.

Item URL in elib:https://elib.dlr.de/102381/
Document Type:Conference or Workshop Item (Lecture)
Title:Towards a Unified Treatment of Stochastic Radiative Transfer of Solar Radiation in Clouds
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Stochastic radiative transfer, stochastic media, broken clouds, sub-pixel cloud inhomogeneity, SHDOM radiative transfer simulations
Event Title:Joint Assembly 2015 of AGU, GAC, MAC and GCU
Event Location:Montreal, Canada
Event Type:international Conference
Event Dates:3 - 7 May 2015
Organizer:American Geophysical Union, Canadian Geophysical Union
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 Spektrometrische Verfahren und Konzepte der Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Trautmann, Prof.Dr. Thomas
Deposited On:25 Jan 2016 14:10
Last Modified:10 May 2016 23:42

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