Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean ...

In this study, we investigate the occurrence of primary biological aerosol particles (PBAP) over all sectors of the Southern Ocean (SO) based on a 90-day data set collected during the Antarctic Circumnavigation Expedition (ACE) in austral summer 2016–2017. Super-micrometer PBAP (1–16 µm diameter) we...

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Bibliographic Details
Main Authors: Moallemi, Alireza, Landwehr, Sebastian, Robinson, Charlotte, Simó, Rafel, Zamanillo, Marina, Chen, Gang, Baccarini, Andrea, Schnaiter, Martin, Henning, Silvia, Modini, Robin L., Gysel-Beer, Martin, Schmale, Julia
Format: Article in Journal/Newspaper
Language:English
Published: ETH Zurich 2021
Subjects:
atmospheric aerosols
bioaerosols
fluorescent aerosols
marine aerosols
sea spray aerosols
Southern Ocean
Antarc*
Antarctic
Online Access:https://dx.doi.org/10.3929/ethz-b-000547408
http://hdl.handle.net/20.500.11850/547408
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Summary:In this study, we investigate the occurrence of primary biological aerosol particles (PBAP) over all sectors of the Southern Ocean (SO) based on a 90-day data set collected during the Antarctic Circumnavigation Expedition (ACE) in austral summer 2016–2017. Super-micrometer PBAP (1–16 µm diameter) were measured by a wide band integrated bioaerosol sensor (WIBS-4). Low (3σ) and high (9σ) fluorescence thresholds are used to obtain statistics on fluorescent and hyper-fluorescent PBAP, respectively. Our focus is on data obtained over the pristine ocean, that is, more than 200 km away from land. The results indicate that (hyper-)fluorescent PBAP are correlated to atmospheric variables associated with sea spray aerosol (SSA) particles (wind speed, total super-micrometer aerosol number concentration, chloride and sodium concentrations). This suggests that a main source of PBAP over the SO is SSA. The median percentage contribution of fluorescent and hyper-fluorescent PBAP to super-micrometer SSA was 1.6% and 0.13%, ... : Journal of Geophysical Research: Atmospheres, 126 (11) ...

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