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Unfiltering of the Geostationary Earth Radiation Budget (GERB) Data. Part II: Longwave Radiation.

dc.contributor.authorClerbaux, N.
dc.contributor.author,Dewitte, S.
dc.contributor.author,Bertrand, C.
dc.contributor.author,Caprion, D.
dc.contributor.author,De Paepe, B.
dc.contributor.authorGonzalez, L.
dc.contributor.authorIpe, A.
dc.contributor.authorRussell, J.E.
dc.coverage.temporal21st century
dc.date2008
dc.date.accessioned2016-03-07T16:16:57Z
dc.date.accessioned2021-12-09T09:53:52Z
dc.date.available2016-03-07T16:16:57Z
dc.date.available2021-12-09T09:53:52Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/8769
dc.descriptionThe method used to estimate the unfiltered longwave broadband radiance from the filtered radiances measured by the Geostationary Earth Radiation Budget (GERB) instrument is presented. This unfiltering method is used to generate the first released edition of the GERB-2 dataset. This method involves a set of regressions between the unfiltering factor (i.e.; the ratio of the unfiltered and filtered broadband radiances) and the narrowband observations of the Spinning Enhanced Visible and Infrared Imager (SEVIRI) instrument. The regressions are theoretically derived from a large database of simulated spectral radiance curves obtained by radiative transfer computations. The generation of this database is fully described. Different sources of error that may affect the GERB unfiltering have been identified and the associated error magnitudes are assessed on the database. For most of the earth–atmosphere conditions, the error introduced during the unfiltering processes is well under 0.5% (RMS error of about 0.1%). For more confidence, the unfiltered radiances of GERB-2 are validated by cross comparison with collocated and coangular Clouds and the Earth’s Radiant Energy System (CERES) observations. The agreement between the unfiltered radiances is within the science goals (1% accuracy for GERB and 0.5% for CERES) for the Flight Model 2 (FM2). For the CERES Flight Model 3 (FM3) instrument, an overall difference of 1.8% is observed. The intercomparisons indicate some scene-type dependency, which is due to the unfiltering for the cloudy scenes. This should be corrected for subsequent editions of the database.
dc.languageeng
dc.publisherIRM
dc.publisherKMI
dc.publisherRMI
dc.relation.ispartofseriesJournal of Atmospheric and Oceanic Technology - Vol 25(7)
dc.titleUnfiltering of the Geostationary Earth Radiation Budget (GERB) Data. Part II: Longwave Radiation.
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceGeneral Public
dc.audienceScientific
dc.subject.freeRadiation budgets
dc.subject.freeRadiances
dc.subject.freeSatellite Observations
dc.subject.freeInstrumentation
dc.source.issueJournal of Atmospheric and Oceanic Technology - Vol 25(7)
dc.source.page1106-1117
Orfeo.peerreviewedNot pertinent


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