Surface and Airborne Measurements of Organosulfur and Methanesulfonate Over the Western United States and Coastal Areas

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dc.contributor.authorSorooshian, Armin
dc.contributor.authorCrosbie, Ewan
dc.contributor.authorMaudlin, Lindsay C.
dc.contributor.authorYoun, Jong-Sang
dc.contributor.authorWang, Zhen
dc.contributor.authorShingler, Taylor
dc.contributor.authorOrtega, Amber M.
dc.contributor.authorHersey, Scott
dc.contributor.authorWoods, Roy K.
dc.contributor.corporateNaval Postgraduate School (U.S.)
dc.date.accessioned2016-08-22T22:00:00Z
dc.date.available2016-08-22T22:00:00Z
dc.date.issued2015
dc.descriptionThe article of record as published may be found at http://dx.doi.org/10.1002/2015JD023822
dc.description.abstractThis study reports on ambient measurements of organosulfur (OS) and methanesulfonate (MSA) over the western United States and coastal areas. Particulate OS levels are highest in summertime, and generally increase as a function of sulfate (a precursor) and sodium (a marine tracer) with peak levels at coastal sites. The ratio of OS to total sulfur (TS) is also highest at coastal sites, with increasing values as a function of Normalized Difference Vegetation Index (NDVI) and the ratio of organic carbon to elemental carbon. Correlative analysis points to significant relationships between OS and biogenic emissions from marine and continental sources, factors that coincide with secondary production, and vanadium due to a suspected catalytic role. A major OS species, methanesulfonate (MSA), was examined with intensive field measurements and the resulting data support the case for vanadium’s catalytic influence. Mass size distributions reveal a dominant MSA peak between aerodynamic diameters of 0.32—0.56 μm at a desert and coastal site with nearly all MSA mass (≥ 84%) in sub-micrometer sizes; MSA:non-sea salt sulfate ratios vary widely as a function of particle size and proximity to the ocean. Airborne data indicate that relative to the marine boundary layer, particulate MSA levels are enhanced in urban and agricultural areas, and also the free troposphere when impacted by biomass burning. Some combination of fires and marine-derived emissions leads to higher MSA levels than either source alone. Finally, MSA differences in cloud water and out-of-cloud aerosol are discussed.
dc.description.funderGrant 2 P42 ES04940–11 from the National Institute of Environmental Health Sciences (NIEHS) Superfund Research Program, NIH, and the Center for Environmentally Sustainable Mining through TRIF Water Sustainability Program funding at the University of Arizona
dc.description.funderONR grants N00014-10-1-0200 and N00014-10-1-0811
dc.identifier.citationSorooshian, Armin, et al. "Surface and airborne measurements of organosulfur and methanesulfonate over the western United States and coastal areas." Journal of Geophysical Research: Atmospheres. v.120 no.16 (2015): pp. 8535-8548.
dc.identifier.urihttps://hdl.handle.net/10945/49690
dc.relation.ispartofseriesFaculty & Researcher Publications
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.titleSurface and Airborne Measurements of Organosulfur and Methanesulfonate Over the Western United States and Coastal Areasen_US
dc.typeArticleen_US
dspace.entity.typePublication
relation.isSeriesOfPublicationc2c3de57-d1f4-47b1-aa53-6f1c074e4c20
relation.isSeriesOfPublication.latestForDiscoveryc2c3de57-d1f4-47b1-aa53-6f1c074e4c20
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