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Glyoxal vertical columns from GOME-2 backscattered light measurements and comparisons with a global model

dc.contributor.authorLerot, C.
dc.contributor.authorStavrakou, T.
dc.contributor.authorDe Smedt, I.
dc.contributor.authorMüller, J.-F.
dc.contributor.authorVan Roozendael, M.
dc.date2010
dc.date.accessioned2016-03-30T12:01:17Z
dc.date.available2016-03-30T12:01:17Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/3183
dc.descriptionGlyoxal vertical column densities have been retrieved from nadir backscattered radiances measured from 2007 to 2009 by the spaceborne GOME-2/METOP-A sensor. The retrieval algorithm is based on the DOAS technique and optimized settings have been used to determine glyoxal slant columns. The liquid water absorption is accounted for using a two-step DOAS approach, leading to a drastic improvement of the fit quality over remote clear water oceans. Air mass factors are calculated by means of look-up tables of weighting functions pre-calculated with the LIDORT v3.3 radiative transfer model and using a priori glyoxal vertical distributions provided by the IMAGESv2 chemical transport model. The total error estimate comprises random and systematic errors associated to the DOAS fit, the air mass factor calculation and the cloud correction. The highest glyoxal vertical column densities are mainly observed in continental tropical regions, while the mid-latitude columns strongly depend on the season with maximum values during warm months. An anthropogenic signature is also observed in highly populated regions of Asia. Comparisons with glyoxal columns simulated with IMAGESv2 in different regions of the world generally point to a missing glyoxal source, most probably of biogenic origin.
dc.languageeng
dc.titleGlyoxal vertical columns from GOME-2 backscattered light measurements and comparisons with a global model
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeair mass
dc.subject.freealgorithm
dc.subject.freeatmospheric chemistry
dc.subject.freeatmospheric modeling
dc.subject.freeatmospheric transport
dc.subject.freebackscatter
dc.subject.freeerror analysis
dc.subject.freeGOME
dc.subject.freeorganic compound
dc.subject.freeradiative transfer
dc.subject.freesatellite sensor
dc.subject.freevertical distribution
dc.subject.freeAsia
dc.source.titleAtmospheric Chemistry and Physics
dc.source.volume10
dc.source.issue24
dc.source.page12059-12072
Orfeo.peerreviewedYes
dc.identifier.doi10.5194/acp-10-12059-2010
dc.identifier.scopus2-s2.0-78650372101


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