Surface and Airborne Measurements of Organosulfur and Methanesulfonate Over the Western United States and Coastal Areas
Maudlin, Lindsay C.
Ortega, Amber M.
Woods, Roy K.
MetadataShow full item record
This 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.
The article of record as published may be found at http://dx.doi.org/10.1002/2015JD023822
Showing items related by title, author, creator and subject.
Jonsson, H.H.; Maudlin, L.C.; Wang, Z.; Sorooshian, A. (Elsevier Ltd., 2015-08-14);Size-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 ...
Wang, Qing; Kang, Doreene (2016-01-22);New sampling techniques such as tethered-balloon-based measurements or small unmanned aerial vehicles are capable of providing multiple profiles of the Marine Atmospheric Surface Layer (MASL) in a short time period. It ...
Chavez, F.P.; Pennington, J.T.; Castro, C.G.; Ryan, J.P.; Michisaki, R.P.; Schlining, B.; Walz, P.; Buck, K.R.; McFadyen, A.; Collins, C.A. (2002);The physical, chemical and biological perturbations in central California waters associated with the strong 1997–1998 El Niño are described and explained on the basis of time series collected from ships, moorings, tide ...