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Global observations of tropospheric BrO columns using GOME-2 satellite data

dc.contributor.authorTheys, N.
dc.contributor.authorVan Roozendael, M.
dc.contributor.authorHendrick, F.
dc.contributor.authorYang, X.
dc.contributor.authorDe Smedt, I.
dc.contributor.authorRichter, A.
dc.contributor.authorBegoin, M.
dc.contributor.authorErrera, Q.
dc.contributor.authorJohnston, P.V.
dc.contributor.authorKreher, K.
dc.contributor.authorDe Maziere, M.
dc.date2011
dc.date.accessioned2016-03-29T12:43:53Z
dc.date.available2016-03-29T12:43:53Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/3131
dc.descriptionMeasurements from the GOME-2 satellite instrument have been analyzed for tropospheric BrO using a residual technique that combines measured BrO columns and estimates of the stratospheric BrO content from a climatological approach driven by O3 and NO2 observations. Comparisons between the GOME-2 results and BrO vertical columns derived from correlative ground-based and SCIAMACHY nadir observations, present a good level of consistency. We show that the adopted technique enables separation of stratospheric and tropospheric fractions of the measured total BrO columns and allows quantitative study of the BrO plumes in polar regions. While some satellite observed plumes of enhanced BrO can be explained by stratospheric descending air, we show that most BrO hotspots are of tropospheric origin, although they are often associated to regions with low tropopause heights as well. Elaborating on simulations using the p-TOMCAT tropospheric chemical transport model, this result is found to be consistent with the mechanism of bromine release through sea salt aerosols production during blowing snow events. No definitive conclusion can be drawn however on the importance of blowing snow sources in comparison to other bromine release mechanisms. Outside polar regions, evidence is provided for a global tropospheric BrO background with column of 1–3 × 1013 molec cm−2, consistent with previous estimates.
dc.languageeng
dc.titleGlobal observations of tropospheric BrO columns using GOME-2 satellite data
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeaerosol
dc.subject.freeatmospheric chemistry
dc.subject.freeatmospheric plume
dc.subject.freebromine
dc.subject.freecomputer simulation
dc.subject.freeglobal perspective
dc.subject.freeGOME
dc.subject.freeground-based measurement
dc.subject.freeion
dc.subject.freenumerical model
dc.subject.freeobservational method
dc.subject.freepolar region
dc.subject.freequantitative analysis
dc.subject.freeSCIAMACHY
dc.subject.freesea salt
dc.subject.freestratosphere
dc.subject.freetropopause
dc.subject.freetroposphere
dc.source.titleAtmospheric Chemistry and Physics
dc.source.volume11
dc.source.issue4
dc.source.page1791-1811
Orfeo.peerreviewedYes
dc.identifier.doi10.5194/acp-11-1791-2011
dc.identifier.scopus2-s2.0-79952080505


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