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dc.contributor.authorBean, Jeffrey K.
Faxon, Cameron B.
Leong, Yu Jun
Wallace, Henry William
Cevik, Basak Karakurt
Ortiz, Stephanie
Canagaratna, Manjula R.
Usenko, Sascha
Sheesley, Rebecca J.
Griffin, Robert J.
Ruiz, Lea Hildebrandt
dc.date.accessioned 2016-07-07T21:09:20Z
dc.date.available 2016-07-07T21:09:20Z
dc.date.issued 2016
dc.identifier.citation Bean, Jeffrey K., Faxon, Cameron B., Leong, Yu Jun, et al.. "Composition and Sources of Particulate Matter Measured near Houston, TX: Anthropogenic-Biogenic Interactions." Atmosphere, 7, no. 5 (2016) MDPI: http://dx.doi.org/10.3390/atmos7050073.
dc.identifier.urihttps://hdl.handle.net/1911/90842
dc.description.abstract Particulate matter was measured in Conroe, Texas (~60 km north of downtown Houston, Texas) during the September 2013 DISCOVER-AQ campaign to determine the sources of particulate matter in the region. The measurement site is influenced by high biogenic emission rates as well as transport of anthropogenic pollutants from the Houston metropolitan area and is therefore an ideal location to study anthropogenic-biogenic interactions. Data from an Aerosol Chemical Speciation Monitor (ACSM) suggest that on average 64 percent of non-refractory PM1 was organic material, including a high fraction (27%–41%) of organic nitrates. There was little diurnal variation in the concentrations of ammonium sulfate; however, concentrations of organic and organic nitrate aerosol were consistently higher at night than during the day. Potential explanations for the higher organic aerosol loadings at night include changing boundary layer height, increased partitioning to the particle phase at lower temperatures, and differences between daytime and nighttime chemical processes such as nitrate radical chemistry. Positive matrix factorization was applied to the organic aerosol mass spectra measured by the ACSM and three factors were resolved—two factors representing oxygenated organic aerosol and one factor representing hydrocarbon-like organic aerosol. The factors suggest that the measured aerosol was well mixed and highly processed, consistent with the distance from the site to major aerosol sources, as well as the high photochemical activity.
dc.language.iso eng
dc.publisher MDPI
dc.rights This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.title Composition and Sources of Particulate Matter Measured near Houston, TX: Anthropogenic-Biogenic Interactions
dc.type Journal article
dc.citation.journalTitle Atmosphere
dc.subject.keywordorganic aerosol
ambient measurements
diurnal variation
positive matrix factorization
dc.citation.volumeNumber 7
dc.citation.issueNumber 5
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.3390/atmos7050073
dc.type.publication publisher version
dc.citation.articleNumber 73


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