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dc.contributor.authorMarais, Eloise Ann
dc.contributor.authorJacob, Daniel J.
dc.contributor.authorKurosu, T
dc.contributor.authorChance, Kelly V.
dc.contributor.authorMurphy, J. G.
dc.contributor.authorReeves, C.
dc.contributor.authorMills, G.
dc.contributor.authorCasadio, S.
dc.contributor.authorMillet, D. B.
dc.contributor.authorBarkley, M. P.
dc.contributor.authorPaulot, F.
dc.contributor.authorMao, J.
dc.date.accessioned2014-03-14T13:05:06Z
dc.date.issued2012
dc.identifier.citationMarais, E. A., D. J. Jacob, T. P. Kurosu, K. Chance, J. G. Murphy, C. Reeves, G. Mills, et al. 2012. Isoprene Emissions in Africa Inferred from OMI Observations of Formaldehyde Columns. Atmospheric Chemistry and Physics 12, no. 14: 6219–6235.en_US
dc.identifier.issn1680-7316en_US
dc.identifier.issn1680-7324en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:11891556
dc.description.abstractWe use 2005–2009 satellite observations of formaldehyde (HCHO) columns from the OMI instrument to infer biogenic isoprene emissions at monthly 1 × 1° resolution over the African continent. Our work includes new approaches to remove biomass burning influences using OMI absorbing aerosol optical depth data (to account for transport of fire plumes) and anthropogenic influences using AATSR satellite data for persistent small-flame fires (gas flaring). The resulting biogenic HCHO columns (ΩHCHO) from OMI follow closely the distribution of vegetation patterns in Africa. We infer isoprene emission (EISOP) from the local sensitivity S = ΔΩHCHO / ΔEISOP derived with the GEOS-Chem chemical transport model using two alternate isoprene oxidation mechanisms, and verify the validity of this approach using AMMA aircraft observations over West Africa and a longitudinal transect across central Africa. Displacement error (smearing) is diagnosed by anomalously high values of S and the corresponding data are removed. We find significant sensitivity of S to NOx under low-NOx conditions that we fit to a linear function of tropospheric column NO2. We estimate a 40% error in our inferred isoprene emissions under high-NOx conditions and 40–90% under low-NOx conditions. Our results suggest that isoprene emission from the central African rainforest is much lower than estimated by the state-of-the-science MEGAN inventory.en_US
dc.description.sponsorshipEarth and Planetary Sciencesen_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherEuropean Geosciences Unionen_US
dc.relation.isversionofdoi:10.5194/acp-12-6219-2012en_US
dash.licenseLAA
dc.titleIsoprene Emissions in Africa Inferred from OMI Observations of Formaldehyde Columnsen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalAtmospheric Chemistry and Physicsen_US
dash.depositing.authorJacob, Daniel J.
dc.date.available2014-03-14T13:05:06Z
dc.identifier.doi10.5194/acp-12-6219-2012*
workflow.legacycommentsCan post pub per sherpa. FAR 2013en_US
dash.authorsorderedfalse
dash.contributor.affiliatedKurosu, Thomas
dash.contributor.affiliatedMarais, Elose
dash.contributor.affiliatedChance, Kelly
dash.contributor.affiliatedJacob, Daniel


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