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Low-molecular-weight hydroxyacids in marine atmospheric aerosol: evidence of a marine microbial origin

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Title: Low-molecular-weight hydroxyacids in marine atmospheric aerosol: evidence of a marine microbial origin
Authors: Miyazaki, Y. Browse this author →KAKEN DB
Sawano, M. Browse this author
Kawamura, K. Browse this author →KAKEN DB
Issue Date: 20-Aug-2014
Publisher: Copernicus Publications
Journal Title: Biogeosciences
Volume: 11
Issue: 16
Start Page: 4407
End Page: 4414
Publisher DOI: 10.5194/bg-11-4407-2014
Abstract: Lactic acid (LA) and glycolic acid (GA), which are low-molecular-weight hydroxyacids, were identified in the particle and gas phases within the marine atmospheric boundary layer over the western subarctic North Pacific. A major portion of LA (81%) and GA (57%) was present in the particulate phase, which is consistent with the presence of a hydroxyl group in these molecules leading to the low volatility of the compounds. The average concentration (±SD) of LA in more biologically influenced marine aerosols (33 ± 58 ng m−3) was substantially higher than that in less biologically influenced aerosols (11 ± 12 ng m−3). Over the oceanic region of phytoplankton blooms, the concentration of aerosol LA was comparable to that of oxalic acid, which was the most abundant diacid during the study period. A positive correlation was found between the LA concentrations in more biologically influenced aerosols and chlorophyll a in seawater (r2 = 0.56), suggesting an important production of aerosol LA possibly associated with microbial (e.g., lactobacillus) activity in seawater and/or aerosols. Our finding provides a new insight into the poorly quantified microbial sources of marine organic aerosols (OAs) because such low-molecular-weight hydroxyacids are key intermediates for OA formation.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 宮崎 雄三

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