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Comparison of measurements and model calculations of stratospheric bromine monoxide

dc.contributor.authorSinnhuber, B.-M.
dc.contributor.authorArlander, D.W.
dc.contributor.authorBovensmann, H.
dc.contributor.authorBurrows, J.P.
dc.contributor.authorChipperfield, M.P.
dc.contributor.authorEnell, C.-F.
dc.contributor.authorFrieß, U.
dc.contributor.authorHendrick, F.
dc.contributor.authorJohnston, P.V.
dc.contributor.authorJones, R.L.
dc.contributor.authorKreher, K.
dc.contributor.authorMohamed-Tahrin, N.
dc.contributor.authorMüller, R.
dc.contributor.authorPfeilsticker, K.
dc.contributor.authorPlatt, U.
dc.contributor.authorPommereau, J.-P.
dc.contributor.authorPundt, I.
dc.contributor.authorRichter, A.
dc.contributor.authorSouth, A.M.
dc.contributor.authorTømkvist, K.K.
dc.contributor.authorVan Roozendael, M.
dc.contributor.authorWagner, T.
dc.contributor.authorWittrock, F.
dc.date2002
dc.date.accessioned2017-05-03T12:37:05Z
dc.date.available2017-05-03T12:37:05Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/5217
dc.descriptionGround-based zenith sky UV-visible measurements of stratospheric bromine monoxide (BrO) slant column densities are compared with simulations from the SLIMCAT three-dimensional chemical transport model. The observations have been obtained from a network of 11 sites, covering high and midlatitudes of both hemispheres. This data set gives for the first time a near-global picture of the distribution of stratospheric BrO from ground-based observations and is used to test our current understanding of stratospheric bromine chemistry. In order to allow a direct comparison between observations and model calculations, a radiative transfer model has been coupled to the chemical model to calculate simulated slant column densities. The model reproduces the observations in general very well. The absolute amount of the BrO slant columns is consistent with a total stratospheric bromine loading of 20 ± 4 ppt for the period 1998-2000, in agreement with previous estimates. The seasonal and latitudinal variations of BrO are well reproduced by the model. In particular, the good agreement between the observed and modeled diurnal variation provides strong evidence that the BrO-related bromine chemistry is correctly modeled. A discrepancy between observed and modeled BrO at high latitudes during events of chlorine activation can be resolved by increasing the rate constant for the reaction BrO + ClO → BrCl + O<inf>2</inf> to the upper limit of current recommendations. However, other possible causes of the discrepancy at high latitudes cannot be ruled out.
dc.languageeng
dc.titleComparison of measurements and model calculations of stratospheric bromine monoxide
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeAtmospheric chemistry
dc.subject.freeBromine compounds
dc.subject.freeDatabase systems
dc.subject.freeMass transfer
dc.subject.freeMathematical models
dc.subject.freeUltraviolet radiation
dc.subject.freeatmospheric modeling
dc.subject.freebromine compound
dc.subject.freecomparative study
dc.subject.freedata set
dc.subject.freediurnal variation
dc.subject.freeground-based measurement
dc.subject.freelatitudinal gradient
dc.subject.freeradiative transfer
dc.subject.freestratosphere
dc.subject.freethree-dimensional modeling
dc.subject.freetransport process
dc.subject.freeultraviolet radiation
dc.source.titleJournal of Geophysical Research: Atmospheres
dc.source.volume107
dc.source.issue19
dc.source.pageA4398
Orfeo.peerreviewedYes
dc.identifier.doi10.1029/2001JD000940
dc.identifier.scopus2-s2.0-33751260907


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