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Angular distribution models anisotropic correction factors and sun glint: a sensitivity study

dc.contributor.authorBertrand, C.
dc.contributor.authorClerbaux, N.
dc.contributor.authorIpe, A.
dc.contributor.authorDewitte, S.
dc.contributor.authorGonzalez, L.
dc.coverage.temporal21st century
dc.date2006
dc.date.accessioned2016-03-07T16:16:53Z
dc.date.accessioned2021-12-09T09:53:40Z
dc.date.available2016-03-07T16:16:53Z
dc.date.available2021-12-09T09:53:40Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/8718
dc.descriptionBecause radiometers do not measure the Earth’s outgoing fluxes directly, angular distribution models (ADMs) are used to invert measured radiances at the top of atmosphere (TOA) to fluxes. In this study, we have investigated if the use of the newly developed clear ocean Clouds and the Earth’s Radiant Energy System (CERES) broadband short wave (SW) ADMs from the Tropical Rainfall Measuring Mission (TRMM) satellite will allow reliable estimation of the instantaneous reflected SW fluxes at the TOA when the measured radiances are contaminated by sun glint. Using SW fluxes estimations computed from Meteosat-7 visible radiances as a surrogate of the forthcoming Geostationary Earth Radiation Budget SW fluxes, our results indicate that while CERES-TRMM ADMs angular resolution presents an advance over the previously built Earth Radiation Budget Experiment (ERBE) ADMs, the angular resolution is still too coarse to suitably define anisotropic correction factors in the sunldight region. SW fluxes are overestimated in the strong sun glint region and underestimated in the surrounding regions. Nevertheless, we show that by combining the high temporal sampling of the sun glint regions afforded by the geostationary orbit of the instrument with information contained in the clear ocean wind-speed-dependent CERES-TRMM ADMs, an improved estimation of the reflected SW flux at the TOA is possible by comparison to a simple ADM flux interpolation.
dc.languageeng
dc.publisherIRM
dc.publisherKMI
dc.publisherRMI
dc.relation.ispartofseries"International Journal of Remote Sensing - Vol 27, No. 9"
dc.titleAngular distribution models anisotropic correction factors and sun glint: a sensitivity study
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceGeneral Public
dc.audienceScientific
dc.subject.freeradiometer
dc.subject.freeADM
dc.subject.freeCERES
dc.subject.freeSW
dc.subject.freeTRMM
dc.subject.freesatellite
dc.subject.freeTOA
dc.source.issue"International Journal of Remote Sensing - Vol 27, No. 9"
dc.source.pagep.1741-1757
Orfeo.peerreviewedNot pertinent


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