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

Trautmann, Thomas und Doicu, Adrian und Efremenko, Dmitry und 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, 2015-05-03 - 2015-05-07, Montreal, Canada.

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

Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/102381/
Dokumentart:Konferenzbeitrag (Vorlesung)
Titel:Towards a Unified Treatment of Stochastic Radiative Transfer of Solar Radiation in Clouds
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Trautmann, Thomasthomas.trautmann (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Doicu, Adrianadrian.doicu (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Efremenko, Dmitrydmitry.efremenko (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Loyola, Diegodiego.loyola (at) dlr.dehttps://orcid.org/0000-0002-8547-9350NICHT SPEZIFIZIERT
Datum:2015
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Stochastic radiative transfer, stochastic media, broken clouds, sub-pixel cloud inhomogeneity, SHDOM radiative transfer simulations
Veranstaltungstitel:Joint Assembly 2015 of AGU, GAC, MAC and GCU
Veranstaltungsort:Montreal, Canada
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:3 Mai 2015
Veranstaltungsende:7 Mai 2015
Veranstalter :American Geophysical Union, Canadian Geophysical Union
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Atmosphärenprozessoren
Hinterlegt von: Trautmann, Prof.Dr. Thomas
Hinterlegt am:25 Jan 2016 14:10
Letzte Änderung:24 Apr 2024 20:08

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