Fluorescent biological aerosol particles over the central Pacific Ocean: covariation with ocean surface biological activity indicators
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Published:2021-10-27
Issue:20
Volume:21
Page:15969-15983
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Kawana KaoriORCID, Matsumoto Kazuhiko, Taketani Fumikazu, Miyakawa TakumaORCID, Kanaya Yugo
Abstract
Abstract. Combining wideband integrated bioaerosol sensors and DNA-staining techniques, online and offline shipboard observations of
fluorescent aerosol particles in the atmosphere were carried out over the
central Pacific Ocean during March 2019 to identify bioaerosols and
determine their spatiotemporal distribution. To understand the origins of
and processes associated with bioaerosols, we conducted correlation analyses
of fluorescent particle number concentration, wind speed, and a variety of
chemical and biological indicators, including concentrations of chlorophyll
a, bacteria, and marine organic gel particles such as transparent exopolymer
particles (TEPs) and Coomassie stainable particles (CSPs). Five-day backward
trajectory analysis indicated that oceanic air masses were dominant between
6 and 18 March, after which the influence of long-range transport from the
continent of Asia was prominent. For the first period, we identified certain
types of fluorescent particles as bioaerosols with marine origins, because
their number concentrations were highly correlated with concentrations of
TEPs and bacteria (R: 0.80–0.92) after considering the wind speed effect.
For the second period, there was strong correlation between another type of
fluorescent particles and CSPs irrespective of wind speed, implying that the
fluorescent particles advected from land were mixed with those of marine
origins. From the results of our correlation analysis, we developed
equations to derive atmospheric bioaerosol number density in the marine
atmosphere over the central Pacific Ocean from a combination of biogenic
proxy quantities (chlorophyll a, TEPs, and bacteria) and wind speed. We
conclude that it is likely that TEPs were transported from the sea surface
to the atmosphere together with bacteria to form fluorescent bioaerosols.
Funder
Japan Society for the Promotion of Science
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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