Home > Publications database > Transition Metal Associations with Primary Biological Particles in Sea Spray Aerosol Generated in a Wave Channel |
Journal Article | FZJ-2015-01722 |
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2014
American Chemical Society
Columbus, Ohio
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Please use a persistent id in citations: doi:10.1021/es403203d
Abstract: In the ocean, breaking waves generate airbubbles which burst at the surface and eject sea spray aerosol(SSA), consisting of sea salt, biogenic organic species, andprimary biological aerosol particles (PBAP). Our overallunderstanding of atmospheric biological particles of marineorigin remains poor. Here, we perform a control experiment,using an aerosol time-of-flight mass spectrometer to measurethe mass spectral signatures of individual particles generated bybubbling a salt solution before and after addition ofheterotrophic marine bacteria. Upon addition of bacteria, animmediate increase occurs in the fraction of individual particlemass spectra containing magnesium, organic nitrogen, andphosphate marker ions. These biological signatures areconsistent with 21% of the supermicrometer SSA particles generated in a previous study using breaking waves in an oceanatmospherewave channel. Interestingly, the wave flume mass spectral signatures also contain metal ions including silver, iron,and chromium. The nascent SSA bioparticles produced in the wave channel are hypothesized to be as follows: (1) whole orfragmented bacterial cells which bioaccumulated metals and/or (2) bacteria-derived colloids or biofilms which adhered to themetals. This study highlights the potential for transition metals, in combination with specific biomarkers, to serve as uniqueindicators for the presence of marine PBAP, especially in metal-impacted coastal regions.
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