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dc.contributor.authorVelasco, Erik
dc.contributor.authorPressley, S.
dc.contributor.authorGrivicke, R.
dc.contributor.authorAllwine, E.
dc.contributor.authorCoons, T.
dc.contributor.authorFoster, W.
dc.contributor.authorJobson, T.
dc.contributor.authorWestberg, H.
dc.contributor.authorRamos, R.
dc.contributor.authorHernandez, F.
dc.contributor.authorMolina, Luisa Tan
dc.contributor.authorLamb, B. K.
dc.date.accessioned2011-09-01T16:05:22Z
dc.date.available2011-09-01T16:05:22Z
dc.date.issued2009-10
dc.date.submitted2009-09
dc.identifier.issn1680-7324
dc.identifier.issn1680-7316
dc.identifier.urihttp://hdl.handle.net/1721.1/65593
dc.description.abstractEddy covariance (EC) flux measurements of the atmosphere/surface exchange of gases over an urban area are a direct way to improve and evaluate emissions inventories, and, in turn, to better understand urban atmospheric chemistry and the role that cities play in regional and global chemical cycles. As part of the MCMA-2003 study, we demonstrated the feasibility of using eddy covariance techniques to measure fluxes of selected volatile organic compounds (VOCs) and CO2 [CO subscript 2] from a residential district of Mexico City (Velasco et al., 2005a, b). During the MILAGRO/MCMA-2006 field campaign, a second flux measurement study was conducted in a different district of Mexico City to corroborate the 2003 flux measurements, to expand the number of species measured, and to obtain additional data for evaluation of the local emissions inventory. Fluxes of CO2 [CO subscript 2] and olefins were measured by the conventional EC technique using an open path CO2 [CO subscript 2] sensor and a Fast Isoprene Sensor calibrated with a propylene standard. In addition, fluxes of toluene, benzene, methanol and C2-benzenes [C subscript 2 - benzenes] were measured using a virtual disjunct EC method with a Proton Transfer Reaction Mass Spectrometer. The flux measurements were analyzed in terms of diurnal patterns and vehicular activity and were compared with the most recent gridded emissions inventory. In both studies, the results showed that the urban surface of Mexico City is a net source of CO2 [CO subscript 2] and VOCs with significant contributions from vehicular traffic. Evaporative emissions from commercial and other anthropogenic activities were significant sources of toluene and methanol. The data show that the emissions inventory is in reasonable agreement with measured olefin and CO2 [CO subscript 2] fluxes, while C2-benzenes [C subscript 2 - benzenes] and toluene emissions from evaporative sources are overestimated in the inventory. It appears that methanol emissions from mobile sources occur, but are not present in the mobile emissions inventory.en_US
dc.description.sponsorshipNational Science Foundation (U.S.) (Grant ATM-0528227)en_US
dc.description.sponsorshipUnited States. Dept. of Energy (Award DE-FG02-05ER63980)en_US
dc.description.sponsorshipMexico. Comisión Ambiental Metropolitanaen_US
dc.description.sponsorshipMolina Center for Energy and the Environmenten_US
dc.language.isoen_US
dc.publisherEuropean Geosciences Union / Copernicusen_US
dc.relation.isversionofhttp://dx.doi.org/10.5194/acpd-9-7991-2009en_US
dc.rightsCreative Commons Attribution 3.0en_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0en_US
dc.sourceCopernicusen_US
dc.titleEddy covariance flux measurements of pollutant gases in urban Mexico Cityen_US
dc.typeArticleen_US
dc.identifier.citationVelasco, E. et al. “Eddy Covariance Flux Measurements of Pollutant Gases in Urban Mexico City.” Atmospheric Chemistry and Physics Discussions 9.2 (2009) : 7991-8034. © Author(s) 2009en_US
dc.contributor.departmentMassachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciencesen_US
dc.contributor.approverMolina, Luisa Tan
dc.contributor.mitauthorVelasco, Erik
dc.contributor.mitauthorMolina, Luisa Tan
dc.relation.journalAtmospheric Chemistry and Physicsen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsVelasco, E.; Pressley, S.; Grivicke, R.; Allwine, E.; Coons, T.; Foster, W.; Jobson, T.; Westberg, H.; Ramos, R.; Hernández, F.; Molina, L. T.; Lamb, B.en
dc.identifier.orcidhttps://orcid.org/0000-0002-3596-5334
mit.licensePUBLISHER_CCen_US
mit.metadata.statusComplete


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