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dc.date.accessioned2018-11-27T14:22:09Z
dc.date.available2018-11-27T14:22:09Z
dc.date.created2015-11-26T16:49:40Z
dc.date.issued2015
dc.identifier.citationKleiv, Øyvind Folkestad, Are Høkedal, Jo Sørensen, Kai Aas, Eyvind . Estimation of upward radiances and reflectances at the surface of the sea from above-surface measurements. Ocean Science. 2015, 11(5), 779-788
dc.identifier.urihttp://hdl.handle.net/10852/65663
dc.description.abstractDuring 4 field days in the years 2009–2011, 22 data sets of measurements were collected in the inner Oslofjord, Norway. The data consist of recordings of spectral nadir radiances in air and water as well as spectral downward irradiance in air. The studied wavelengths are 351, 400, 413, 443, 490, 510, 560, 620, 665, 681, 709 and 754 nm. The water-leaving radiance and the reflected radiance at the sea surface have been obtained from the measured nadir radiances in air and water, where the latter radiance has been extrapolated upwards to the surface. For comparison we present a simpler and much faster method that determines the water-leaving and reflected radiances solely from above-surface measurements of upward nadir radiance and downward irradiance. This new method is based on an assumption about similarity in spectral shape of the radiance reflected at the surface, and it makes use of the small ratio between water-leaving and reflected radiances at 351 and 754 nm in the Oslofjord. A comparison between the quantities determined by the two mentioned methods shows that the average relative deviations between their results are less than or equal to 15 % for the reflected radiance, at the studied wavelengths. The average relative deviation of the water-leaving radiance at 560 nm is 24 %. These results are obtained for a cloudiness range of 1–8 oktas (12.5–100 %) and solar zenith angles between 37 and 51°. We consider these to be acceptable uncertainties for a first check of satellite products in the inner Oslofjord.
dc.description.abstractEstimation of upward radiances and reflectances at the surface of the sea from above-surface measurements
dc.languageEN
dc.publisherEuropean Geosciences Union
dc.rightsAttribution 3.0 Unported
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.titleEstimation of upward radiances and reflectances at the surface of the sea from above-surface measurements
dc.title.alternativeENEngelskEnglishEstimation of upward radiances and reflectances at the surface of the sea from above-surface measurements
dc.typeJournal article
dc.creator.authorKleiv, Øyvind
dc.creator.authorFolkestad, Are
dc.creator.authorHøkedal, Jo
dc.creator.authorSørensen, Kai
dc.creator.authorAas, Eyvind
cristin.unitcode185,15,22,0
cristin.unitnameInstitutt for geofag
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1
dc.identifier.cristin1293948
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Ocean Science&rft.volume=11&rft.spage=779&rft.date=2015
dc.identifier.jtitleOcean Science
dc.identifier.volume11
dc.identifier.issue5
dc.identifier.startpage779
dc.identifier.endpage788
dc.identifier.doihttp://dx.doi.org/10.5194/os-11-779-2015
dc.identifier.urnURN:NBN:no-68350
dc.type.documentTidsskriftartikkel
dc.type.peerreviewedPeer reviewed
dc.source.issn1812-0784
dc.identifier.fulltextFulltext https://www.duo.uio.no/bitstream/handle/10852/65663/1/1293948.pdf
dc.type.versionPublishedVersion


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