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ALIS: An efficient method to compute high spectral resolution polarized solar radiances using the Monte Carlo approach

Emde, Claudia and Buras, Robert and Mayer, Bernhard (2011) ALIS: An efficient method to compute high spectral resolution polarized solar radiances using the Monte Carlo approach. Journal of Quantitative Spectroscopy and Radiative Transfer, 112, pp. 1622-1631. DOI: 10.1016/j.jqsrt.2011.03.018.

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Official URL: http://www.sciencedirect.com/science/journal/00224073/112/10

Abstract

An efficientmethodtocomputeaccuratepolarizedsolarradiancespectrausingthe(3D) MonteCarlomodelMYSTIChasbeendeveloped.Suchhighresolutionspectraare measuredbyvarioussatelliteinstrumentsforremotesensingofatmospherictrace gases.ALIS(AbsorptionLinesImportanceSampling)allowsthecalculationofspectraby tracingphotonsatonlyonewavelength.Inordertotakeintoaccountthespectral dependenceoftheabsorptioncoefficientaspectralabsorptionweightiscalculatedfor each photonpath.Ateachscatteringeventthelocalestimatemethodiscombinedwith an importancesamplingmethodtotakeintoaccountthespectraldependenceofthe scatteringcoefficient.Sinceeachwavelengthgridpointiscomputedbasedonthesame set ofrandomphotonpaths,thestatisticalerrorisalmostsameforallwavelengthsand hencethesimulatedspectrumisnotnoisy.Thestatisticalerrormainlyresultsinasmall relativedeviationwhichisindependentofwavelengthandcanbeneglectedforthose remotesensingapplications,wheredifferentialabsorptionfeaturesareofinterest. Two exampleapplicationsarepresented:Thesimulationofshortwave-infrared polarizedspectraasmeasuredbyGOSATfromwhichCO2 is retrieved,andthe simulationofthedifferentialopticalthicknessinthevisiblespectralrangewhichis derivedfromSCIAMACHYmeasurementstoretrieveNO2. Thecomputationalspeedof ALIS (for1Dor3Datmospheres)isoftheorderoforevenfasterthanthatofone- dimensionaldiscreteordinatemethods,inparticularwhenpolarizationisconsidered.

Document Type:Article
Title:ALIS: An efficient method to compute high spectral resolution polarized solar radiances using the Monte Carlo approach
Authors:
AuthorsInstitution or Email of Authors
Emde, ClaudiaDLR / LMU
Buras, RobertLMU
Mayer, BernhardDLR / LMU
Date:2011
Journal or Publication Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:112
DOI:10.1016/j.jqsrt.2011.03.018
Page Range:pp. 1622-1631
Status:Published
Keywords:Radiative transfer; Monte Carlomethod; Polarization; Trace gas remotesensing; High spectralresolution
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space, Aeronautics, Transport
HGF - Program Themes:Earth Observation, ATM and Operation, Transport System
DLR - Research area:Raumfahrt, Aeronautics, Transport
DLR - Program:R EO - Erdbeobachtung, L AO - Air Traffic Management and Operation, V VS - Verkehrssystem
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung, L - Climate, Weather and Environment, V - Verkehrsentwicklung und Umwelt (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Jana Freund
Deposited On:15 Dec 2011 13:19
Last Modified:12 Dec 2013 21:29

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