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Contribution of biomass burning to carbonaceous aerosols in Mexico City during May 2013

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dc.contributor.authorTzompa Sosa, Zitely Asafay, author
dc.contributor.authorKreidenweis, Sonia M., advisor
dc.contributor.authorFischer, Emily, committee member
dc.contributor.authorSullivan, Amy, committee member
dc.contributor.authorVolckens, John, committee member
dc.date.accessioned2007-01-03T06:51:07Z
dc.date.available2007-01-03T06:51:07Z
dc.date.issued2014
dc.description.abstractThe Mexico City Metropolitan Area (MCMA) is one of the largest megacities in the world with a population of 20 million people. Anthropogenic emissions have been controlled in past decades; however, emissions transported from outside the basin, such as wildfires and agricultural burning, represent a potentially large contribution to air quality degradation. This study analyzed PM10 filter samples from six different stations located across the MCMA from May, 2013, which represented the month with the most reported fire counts in the region over the last 11 years (2002-2013). Two meteorological regimes were established considering the number of satellite derived fire counts, changes in predominant wind direction, ambient concentrations of CO, PM10 and PM2.5, and precipitation patterns inside MCMA. The filter samples were analyzed for biomass burning tracers including levoglucosan (LEV), water-soluble potassium (WSK+); and water-soluble organic carbon (WSOC). Results of these analyses show that LEV concentrations correlated positively with ambient concentrations of PM2.5 and PM10 (R2=0.61 and R2=0.46, respectively). Strong correlations were also found between WSOC and LEV (R2=0.94) and between WSK+ and LEV (R2=0.75). An average LEV/WSOC ratio of 0.0147 was estimated for Regime 1 and 0.0062 for Regime 2. Our LEV concentrations and LEV/WSOC ratios are consistent with results found during the MILAGRO campaign (March, 2006). To the best of our knowledge, only total potassium concentrations have been measured in aerosol samples from MCMA. Therefore, this is the first study in MCMA to measure ambient concentrations of WSK+. Analysis of gravimetric mass concentrations showed that PM2.5 accounted for 60% of the PM10 mass concentration with an estimated PM10/PM2.5 ratio of 1.68. Estimates from our laboratory filter sample characterization indicated that we measured 37% of the total PM10 mass concentration. The missing mass is most likely crustal material (soil or dust) and carbonaceous aerosols that were not segregated into WSOC fraction. Assuming that LEV is inert in the atmosphere, the estimated biomass burning contributions to WSOC ranged from 7-23%. When assuming a LEV lifetime of 1.1 to 5 days, the estimated contributions increased on average 80%. Thus, we conclude that biomass burning sources had a large impact on WSOC and PM2.5 during May 2013, potentially explaining up to half of the measured WSOC. Our results indicate that primary emissions from biomass burning sources represent significant contributions to ambient PM. Future studies are needed to improve the emission inventories that are commonly used by decision makers in the MCMA to design air quality policies and emission source controls.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierTzompaSosa_colostate_0053N_12553.pdf
dc.identifier.urihttp://hdl.handle.net/10217/84566
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectair quality
dc.subjectbiomass burning
dc.subjectlevoglucosan
dc.subjectMexico City
dc.subjectpotassium
dc.subjectwater-soluble organic carbon
dc.titleContribution of biomass burning to carbonaceous aerosols in Mexico City during May 2013
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineAtmospheric Science
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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