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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ftunivtsydney:oai:opus.lib.uts.edu.au:10453/154608 2023-05-15T14:02:14+02:00 Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean. Moallemi, A Landwehr, S Robinson, C Simó, R Zamanillo, M Chen, G Baccarini, A Schnaiter, M Henning, S Modini, RL Gysel-Beer, M Schmale, J 2022-02-16T05:11:08Z Print-Electronic application/pdf http://hdl.handle.net/10453/154608 eng eng American Geophysical Union Journal of Geophysical Research: Atmospheres 10.1029/2021JD034811 Journal of Geophysical Research: Atmospheres, 2021, 126, (11), pp. 1-24 2169-897X 2169-8996 http://hdl.handle.net/10453/154608 info:eu-repo/semantics/openAccess 0401 Atmospheric Sciences 0406 Physical Geography and Environmental Geoscience Journal Article 2022 ftunivtsydney 2022-03-13T13:19:56Z 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%, respectively. We demonstrate that the fraction of (hyper-)fluorescent PBAP to total super-micrometer particles positively correlates with concentrations of bacteria and several taxa of pythoplankton measured in seawater, indicating that marine biota concentrations modulate the PBAP source flux. We investigate the fluorescent properties of (hyper-)fluorescent PBAP for several events that occurred near land masses. We find that the fluorescence signal characteristics of particles near land is much more variable than over the pristine ocean. We conclude that the source and concentration of fluorescent PBAP over the open ocean is similar across all sampled sectors of the SO. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of Technology Sydney: OPUS - Open Publications of UTS Scholars Antarctic Southern Ocean The Antarctic Austral |
institution |
Open Polar |
collection |
University of Technology Sydney: OPUS - Open Publications of UTS Scholars |
op_collection_id |
ftunivtsydney |
language |
English |
topic |
0401 Atmospheric Sciences 0406 Physical Geography and Environmental Geoscience |
spellingShingle |
0401 Atmospheric Sciences 0406 Physical Geography and Environmental Geoscience Moallemi, A Landwehr, S Robinson, C Simó, R Zamanillo, M Chen, G Baccarini, A Schnaiter, M Henning, S Modini, RL Gysel-Beer, M Schmale, J Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean. |
topic_facet |
0401 Atmospheric Sciences 0406 Physical Geography and Environmental Geoscience |
description |
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%, respectively. We demonstrate that the fraction of (hyper-)fluorescent PBAP to total super-micrometer particles positively correlates with concentrations of bacteria and several taxa of pythoplankton measured in seawater, indicating that marine biota concentrations modulate the PBAP source flux. We investigate the fluorescent properties of (hyper-)fluorescent PBAP for several events that occurred near land masses. We find that the fluorescence signal characteristics of particles near land is much more variable than over the pristine ocean. We conclude that the source and concentration of fluorescent PBAP over the open ocean is similar across all sampled sectors of the SO. |
format |
Article in Journal/Newspaper |
author |
Moallemi, A Landwehr, S Robinson, C Simó, R Zamanillo, M Chen, G Baccarini, A Schnaiter, M Henning, S Modini, RL Gysel-Beer, M Schmale, J |
author_facet |
Moallemi, A Landwehr, S Robinson, C Simó, R Zamanillo, M Chen, G Baccarini, A Schnaiter, M Henning, S Modini, RL Gysel-Beer, M Schmale, J |
author_sort |
Moallemi, A |
title |
Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean. |
title_short |
Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean. |
title_full |
Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean. |
title_fullStr |
Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean. |
title_full_unstemmed |
Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean. |
title_sort |
sources, occurrence and characteristics of fluorescent biological aerosol particles measured over the pristine southern ocean. |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
http://hdl.handle.net/10453/154608 |
geographic |
Antarctic Southern Ocean The Antarctic Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
Journal of Geophysical Research: Atmospheres 10.1029/2021JD034811 Journal of Geophysical Research: Atmospheres, 2021, 126, (11), pp. 1-24 2169-897X 2169-8996 http://hdl.handle.net/10453/154608 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766272389313724416 |