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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: |
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| 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, Aeronautics, Space and Transport, Aeronautics, Space and Transport | ||||||||
| HGF - Program: | Raumfahrt, Aeronautics, Transport | ||||||||
| HGF - Program Themes: | R EO - Erdbeobachtung, L AO - Air Traffic Management and Operation, V VS - Verkehrssystem | ||||||||
| 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: | 07 Feb 2013 20:14 |
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