Light-enhanced primary marine aerosol production from biologically productive seawater

TitleLight-enhanced primary marine aerosol production from biologically productive seawater
Publication TypeJournal Article
Year of Publication2014
AuthorsLong M.S, Keene W.C, Kieber D.J, Frossard AA, Russell LM, Maben J.R, Kinsey J.D, Quinn P.K, Bates T.S
JournalGeophysical Research Letters
Date Published2014/04
Type of ArticleArticle
ISBN Number0094-8276
Accession NumberWOS:000334983000057
Keywordsaerosol production; biogeochemistry; breaking; bubbles; carbon; interface; marine aerosol; organic-matter enrichment; sea spray aerosol; side-scan sonar; size; surface; waves; whitecaps

Physical and biogeochemical processes in seawater controlling primary marine aerosol (PMA) production and composition are poorly understood and associated with large uncertainties in estimated fluxes into the atmosphere. PMA production was investigated in the biologically productive NE Pacific Ocean and in biologically productive and oligotrophic regions of the NW Atlantic Ocean. Physicochemical properties of model PMA, produced by aeration of fresh seawater under controlled conditions, were quantified. Diel variability in model PMA mass and number fluxes was observed in biologically productive waters, increasing following sunrise and decreasing to predawn levels overnight. Such variability was not seen in oligotrophic waters. During daytime, surfactant scavenging by aeration in the aerosol generator without replenishing the seawater in the reservoir reduced the model PMA production in productive waters to nighttime levels but had no influence on production from oligotrophic waters. Results suggest bubble plume interactions with sunlight-mediated biogenic surfactants in productive seawater significantly enhanced model PMA production.

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