Measurement report: Atmospheric fluorescent bioaerosol concentrations measured during 18 months in a coniferous forest in the south of Sweden
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Published:2023-05-03
Issue:9
Volume:23
Page:4977-4992
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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:
Petersson Sjögren Madeleine, Alsved Malin, Šantl-Temkiv Tina, Bjerring Kristensen ThomasORCID, Löndahl JakobORCID
Abstract
Abstract. Biological aerosol particles affect human health, are
essential for microbial and gene dispersal, and have been proposed as important agents for atmospheric processes. However, the abundance and size
distributions of atmospheric biological particles are largely unknown. In
this study we used a laser-induced fluorescence instrument to measure
fluorescent biological aerosol particle (FBAP) concentrations for 18 months
(October 2020–April 2022) at a rural, forested site in Sweden. The aim of
this study was to investigate FBAP number concentrations (NFBAP) over
time and analyze their relationship with meteorological parameters. NFBAP was highest in summer and lowest in winter, exhibiting a ∼ 5-fold difference between these seasons. The median
NFBAP was 0.0050, 0.0025, 0.0027, and 0.0126 cm−3 in fall, winter, spring, and summer, respectively, and constituted ∼ 0.1–0.5 % of the total supermicron particle number concentration.
NFBAP was dominated by the smallest measured size fraction (1–3 µm), suggesting that the main portions of the biological particles measured were due to single bacterial cells, fungal spores, and bacterial
agglomerates. NFBAP was significantly correlated with increasing air temperature (P<0.01) in all seasons. For most of the campaign
NFBAP was seen to increase with wind speed (P<0.01), while the
relationship with relative humidity was for most of the campaign nonsignificant (46 %) but for a large part (30 %) negative (P<0.05). Our results indicate that NFBAP was highest during warm and dry conditions when wind speeds were high, suggesting that a major part of the
FBAP in spring and summer was due to mechanical aerosol generation and release mechanisms. In fall, relative humidity may have been a more important factor in bioaerosol release. This is one of the longest time series of atmospheric FBAPs, which are greatly needed for estimates of bioaerosol background concentrations in comparable regions.
Funder
Svenska Forskningsrådet Formas AFA Försäkring
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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