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Estimating cloud optical thickness and associated surface UV irradiance from SEVIRI by implementing a semi-analytical cloud retrieval algorithm

dc.contributor.authorPandey, P.
dc.contributor.authorDe Ridder, K.
dc.contributor.authorGillotay, D.
dc.contributor.authorVan Lipzig, N.P.M.
dc.date2012
dc.date.accessioned2016-03-29T10:07:36Z
dc.date.available2016-03-29T10:07:36Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/2981
dc.descriptionIn this paper, we describe the implementation of the Semi-Analytical Cloud Retrieval Algorithm (SACURA), to obtain scaled cloud optical thickness (SCOT) from satellite imagery acquired with the SEVIRI instrument and surface UV irradiance levels. In estimation of SCOT particular care is given to the proper specification of the background (i.e. cloud-free) spectral albedo and the retrieval of the cloud water phase from reflectance ratios in SEVIRI's 0.6 μm and 1.6 μm spectral bands. The SACURA scheme is then applied to daytime SEVIRI imagery over Europe, for the month of June 2006, at 15-min time increments. The resulting SCOT fields are compared with values obtained by the CloudSat experimental satellite mission, yielding a negligible bias, correlation coefficients ranging from 0.51 to 0.78, and a root mean square difference of 1 to 2 SCOT increments. These findings compare favourably to results from similar intercomparison exercises reported in the literature. Based on the retrieved SCOT from SEVIRI and radiative transfer modelling approach, simple parameterisations are proposed to estimate the surface UV-A and UV-B irradiance. The validation of the modelled UV-A and UV-B irradiance against the measurements over two Belgian stations, Redu and Ostend, indicate good agreement with the high correlation, index of agreement and low bias. The SCOT fields estimated by implementing SACURA on imagery from geostationary satellite are reliable and its impact on surface UV irradiance levels is well produced.
dc.languageeng
dc.titleEstimating cloud optical thickness and associated surface UV irradiance from SEVIRI by implementing a semi-analytical cloud retrieval algorithm
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freealgorithm
dc.subject.freecloud cover
dc.subject.freecloud radiative forcing
dc.subject.freeCloudSat
dc.subject.freecomparative study
dc.subject.freeestimation method
dc.subject.freeirradiance
dc.subject.freeoptical depth
dc.subject.freeparameterization
dc.subject.freeradiative transfer
dc.subject.freesatellite imagery
dc.subject.freeSEVIRI
dc.subject.freespectral reflectance
dc.subject.freeultraviolet A radiation
dc.subject.freeultraviolet B radiation
dc.subject.freeEurope
dc.source.titleAtmospheric Chemistry and Physics
dc.source.volume12
dc.source.issue17
dc.source.page7961-7975
Orfeo.peerreviewedYes
dc.identifier.doi10.5194/acp-12-7961-2012
dc.identifier.scopus2-s2.0-84869068658


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