Show simple item record

Unfiltering of the Geostationary Earth Radiation Budget (GERB) Data. Part I: Shortwave Radiation.

dc.contributor.authorClerbaux, N.
dc.contributor.authorDewitte, S.
dc.contributor.authorBertrand, C.
dc.contributor.authorCaprion, D.
dc.contributor.authorDe Paepe, B.
dc.contributor.authorGonzalez, L.
dc.contributor.authorIpe, A.
dc.contributor.authorRussell,J.E.
dc.contributor.authorBrindley, H.
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/8770
dc.descriptionThe method used to estimate the unfiltered shortwave 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. The 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 the 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 this database. For most of the earth–atmosphere conditions, the error introduced during the unfiltering process is below 1%. In some conditions (e.g.; low sun elevation above the horizon) the error can present a higher relative value, but the absolute error value remains well under the accuracy goal of 1% of the full instrument scale (2.4 W m−2 sr−1). To increase the confidence level, the edition 1 unfiltered radiances of GERB-2 are validated by cross comparison with collocated and coangular Clouds and the Earth’s Radiant Energy System (CERES) observations for different scene types. In addition to an overall offset between the two instruments, the intercomparisons indicate a scene-type dependency up to 4% in unfiltered radiance. Further studies are required to confirm the cause, but an insufficiently accurate characterization of the shortwave spectral response of the GERB instrument in the visible part of the spectrum is one area under further investigation.
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 I: Shortwave 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.page1087-1105
Orfeo.peerreviewedNot pertinent


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record