Detecting high contributions of primary organic matter to marine aerosol: A case study

Mathematics – Logic

Scientific paper

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Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610)

Scientific paper

Using on-line High-Resolution Aerosol Mass Spectrometry, we report submicron organic marine aerosol plume concentrations peaking at 3.8 μg m-3. These concentrations are far greater than previously determined by off-line techniques and can exceed typical terrestrial concentrations of organic aerosol. The organic mass comprised 77% of the total submicron non-refractory mass and such plumes were associated with regions of high biological activity and moderately-high wind speeds over the N.E. Atlantic. High-resolution mass spectra analysis revealed a unique marine organic aerosol fingerprint, when compared to anthropogenic organic aerosol, and in particular, anthropogenic hydrocarbons. 37% hydrocarbon and 63% oxygenated hydrocarbon speciation was observed for the organic mass, indicating that at least 37% of the organic mass is produced via primary sea-spray. The hydrocarbon and oxygenated hydrocarbon species were highly correlated (r > 0.99) suggesting a significant, if not dominant, fraction of the oxygenated component is also likely to be sea-spray in origin.

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