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dc.contributor.authorJonsson, H.H.
dc.contributor.authorMaudlin, L.C.
dc.contributor.authorWang, Z.
dc.contributor.authorSorooshian, A.
dc.dateAugust 14, 2015
dc.date.accessioned2016-06-13T16:07:58Z
dc.date.available2016-06-13T16:07:58Z
dc.date.issued2015-08-14
dc.identifier.citationAtmospheric Environment 119 (2015) 59e68en_US
dc.identifier.urihttp://hdl.handle.net/10945/48921
dc.descriptionThe article of record as published may be found at http://dx.doi.org/10.1016/j.atmosenv.2015.08.0391352-2310en_US
dc.description.abstractSize-resolved aerosol composition measurements were conducted at a coastal site in central California during the Nucleation in California Experiment (NiCE) between July and August of 2013. The site is just east of ship and marine emission sources and is also influenced by continental pollution and wildfires, such as those near the CaliforniaeOregon border which occurred near the end of NiCE. Two micro-orifice uniform deposit impactors (MOUDIs) were used, and water-soluble and elemental compositions were measured. The five most abundant water-soluble species (in decreasing order) were chloride, sodium, non-sea salt (nss) sulfate, ammonium, and nitrate. During wildfire periods, nss K mass concentrations were not enhanced as strongly as other species in the sub-micrometer stages and even decreased in the super-micrometer stages; species other than nss K are more reliable tracers for biomass burning in this region. Chloride levels were reduced in the fire sets likely due to chloride depletion by inorganic and organic acids that exhibited elevated levels in transported plumes. During wildfire periods, the mass size distribution of most dicarboxylic acids changed from unimodal to bimodal with peaks in the 0.32 mm and 1.0e1.8 mm stages. Furthermore, sulfate's peak concentration shifted from the 0.32 mm to 0.56 mm stage, and nitrate also shifted to larger sizes (1.0 mm to 1.8e3.2 mm stages). Mass concentrations of numerous soil tracer species (e.g., Si, Fe) were strongly enhanced in samples influenced by wildfires, especially in the sub-micrometer range. Airborne cloud water data confirm that soil species were associated with fire plumes transported south along the coast. In the absence of biomass burning, cloud condensation nuclei (CCN) composition is dominated by nss sulfate and ammonium, and the water-soluble organic fraction is dominated by methanesulfonate, whereas for the samples influenced by wildfires, ammonium becomes the dominant overall species, and oxalate is the most abundant organic species.en_US
dc.description.sponsorshipONR grants N00014-11-1-0783, N00014-10-1-0200, and N00014-10-1-0811.en_US
dc.description.sponsorshipNOAA Air Resources Laboratory (ARL)en_US
dc.description.sponsorshipNaval Research Laboratory and EPA IMPROVE networken_US
dc.format.extent10 p.en_US
dc.publisherElsevier Ltd.en_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.en_US
dc.titleImpact of wildfires on size-resolved aerosol composition at a coastal California siteen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.subject.authorMOUDIen_US
dc.subject.authorBiomass burningen_US
dc.subject.authorMarineen_US
dc.subject.authorAerosolen_US
dc.subject.authorCompositionen_US
dc.subject.authorSoilen_US
dc.subject.authorCloud wateren_US
dc.description.funderONR grants N00014-11-1-0783, N00014-10-1-0200, and N00014-10-1-0811.en_US
dc.description.funderNOAA Air Resources Laboratory (ARL)en_US
dc.description.funderNaval Research Laboratory and EPA IMPROVE networken_US


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