An urban photochemistry study in Santiago de Chile

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dc.contributor.authorRappengluck, B
dc.contributor.authorSchmitz, R
dc.contributor.authorBauerfeind, M
dc.contributor.authorCereceda Balic, F
dc.contributor.authorvon Baer, D
dc.contributor.authorJorquera, H
dc.contributor.authorSilva, Y
dc.contributor.authorOyola, P
dc.date.accessioned2024-01-10T13:45:58Z
dc.date.available2024-01-10T13:45:58Z
dc.date.issued2005
dc.description.abstractDuring spring time 2002 a field experiment was carried out in the Metropolitan Area of Santiago de Chile at three monitoring sites located along a SW-NE transect that represents upwind, downtown and downwind conditions, respectively. Three consecutive days (30 October-01 November 2002) reflecting different photochemical and meteorological conditions were selected. These days included two workdays and one holiday and thus the effect of different primary emissions could be investigated. A variety of trace gas measurements (O-3, NOx, CO, volatile organic compounds (VOC)) were obtained at these sites. Alkanes represent the largest VOC fraction at all sites, followed by aromatics and alkenes, the smallest fractions are represented by the alkynes or isoprene. Regarding reactivity ranking propene equivalent values show that during morning hours, alkenes are the most reactive compounds, at noon, aromatics are dominant, and in the afternoon isoprene becomes important. Alkanes do not contribute more than 20% to the total air mass reactivity despite being present at the higher concentration levels. Regarding liquefied petroleum gas (LPG) impacts, we find a threefold decrease of concentrations at the eastern side of the city-and no significant trend at Downtown Santiago-which we ascribe to a switch to natural gas in the higher income eastern side of town. The generation of ozone impacts above 50 ppbv is mainly due to anthropogenic traffic-related hydrocarbons. In addition, traffic emissions are contributing most to the formation of secondary organic aerosols (SOA). A model study was carried out, applying a Lagrange trajectory model coupled with photochemical and aerosol modules. The model results are in good agreement with the observations. Additionally, the relative contribution of the respective hydrocarbons to the ozone production in an air parcel along the trajectory was computed. The model also indicates SOA formation by means of oxidation of higher alkanes, alkenes, and aromatics, the latter being the major contributors to those secondary pollutants. (c) 2005 Elsevier Ltd. All rights reserved.
dc.fechaingreso.objetodigital20-03-2024
dc.format.extent19 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.atmosenv.2004.12.049
dc.identifier.eissn1873-2844
dc.identifier.issn1352-2310
dc.identifier.urihttps://doi.org/10.1016/j.atmosenv.2004.12.049
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/79104
dc.identifier.wosidWOS:000230184500009
dc.information.autorucIngeniería;Jorquera H;S/I;100302
dc.issue.numero16
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final2931
dc.pagina.inicio2913
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.revistaATMOSPHERIC ENVIRONMENT
dc.rightsacceso restringido
dc.subjectSantiago de Chile
dc.subjectNMHC
dc.subjectpropene-equivalent
dc.subjectRADM2
dc.subjectMADE/SORGAM
dc.subjectSUBTROPICAL WEST-COAST
dc.subjectAIR-QUALITY
dc.subjectNONMETHANE HYDROCARBONS
dc.subjectORGANIC AEROSOL
dc.subjectSOUTH-AMERICA
dc.subjectOZONE
dc.subjectPOLLUTION
dc.subjectSITES
dc.subjectPM2.5
dc.subjectEMISSIONS
dc.subject.ods13 Climate Action
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa13 Acción por el clima
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleAn urban photochemistry study in Santiago de Chile
dc.typeartículo
dc.volumen39
sipa.codpersvinculados100302
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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