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Twelve years of global observations of formaldehyde in the troposphere using GOME and SCIAMACHY sensors

dc.contributor.authorDe Smedt, I.
dc.contributor.authorMüller, J.-F.
dc.contributor.authorStavrakou, T.
dc.contributor.authorVan Der A, R.
dc.contributor.authorEskes, H.
dc.contributor.authorVan Roozendael, M.
dc.date2008
dc.date.accessioned2016-09-21T09:32:09Z
dc.date.available2016-09-21T09:32:09Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/4297
dc.descriptionThis work presents global tropospheric formaldehyde columns retrieved from near-UV radiance measurements performed by the GOME instrument onboard ERS-2 since 1995, and by SCIAMACHY, in operation on ENVISAT since the end of 2002. A special effort has been made to ensure the coherence and quality of the CH 2O dataset covering the period 1996-2007. Optimised DOAS settings are proposed in order to reduce the impact of two important sources of error in the derivation of slant columns, namely, the polarisation anomaly affecting the SCIAMACHY spectra around 350 nm, and a major absorption band of the O 4 collision complex centred near 360 nm. The air mass factors are determined from scattering weights generated using radiative transfer calculations taking into account the cloud fraction, the cloud height and the ground albedo. Vertical profile shapes of CH2O are provided by the global CTM IMAGES based on an up-to-date representation of emissions, atmospheric transport and photochemistry. A comprehensive error analysis is presented. This includes errors on the slant columns retrieval and errors on the air mass factors which are mainly due to uncertainties in the a priori profile and in the cloud properties. The major features of the retrieved formaldehyde column distribution are discussed and compared with previous CH2O datasets over the major emission regions.
dc.languageeng
dc.titleTwelve years of global observations of formaldehyde in the troposphere using GOME and SCIAMACHY sensors
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeair mass
dc.subject.freealbedo
dc.subject.freecloud
dc.subject.freecomparative study
dc.subject.freedata set
dc.subject.freeEnvisat-1
dc.subject.freeformaldehyde
dc.subject.freeGOME
dc.subject.freeradiative transfer
dc.subject.freeSCIAMACHY
dc.subject.freetroposphere
dc.source.titleAtmospheric Chemistry and Physics
dc.source.volume8
dc.source.issue16
dc.source.page4947-4963
Orfeo.peerreviewedYes
dc.identifier.doi10.5194/acp-8-4947-2008
dc.identifier.scopus2-s2.0-50549098993


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