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...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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AMER GEOPHYSICAL UNION
2021
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| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/DP160103387 http://hdl.handle.net/20.500.11937/91008 |
| _version_ | 1848765484490555392 |
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| author | Moallemi, A. Landwehr, S. Robinson, Charlotte Simó, R. Zamanillo, M. Chen, G. Baccarini, A. Schnaiter, M. Henning, S. Modini, R.L. Gysel-Beer, M. Schmale, J. |
| author_facet | Moallemi, A. Landwehr, S. Robinson, Charlotte Simó, R. Zamanillo, M. Chen, G. Baccarini, A. Schnaiter, M. Henning, S. Modini, R.L. Gysel-Beer, M. Schmale, J. |
| author_sort | Moallemi, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-14T11:35:59Z |
| format | Journal Article |
| id | curtin-20.500.11937-91008 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:35:59Z |
| publishDate | 2021 |
| publisher | AMER GEOPHYSICAL UNION |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-910082023-05-17T00:50:15Z Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean Moallemi, A. Landwehr, S. Robinson, Charlotte Simó, R. Zamanillo, M. Chen, G. Baccarini, A. Schnaiter, M. Henning, S. Modini, R.L. Gysel-Beer, M. Schmale, J. Science & Technology Physical Sciences Meteorology & Atmospheric Sciences Atmospheric aerosols bioaerosols fluorescent aerosols marine aerosols sea spray aerosols Southern Ocean SEA SPRAY AEROSOL CLOUD CONDENSATION NUCLEI ICE NUCLEI AIRBORNE OBSERVATIONS MARINE AEROSOLS ORGANIC-MATTER BIOAEROSOL FOREST DISTRIBUTIONS MICROSCOPY Atmospheric aerosols Southern Ocean bioaerosols fluorescent aerosols marine aerosols sea spray aerosols 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. 2021 Journal Article http://hdl.handle.net/20.500.11937/91008 10.1029/2021JD034811 English http://purl.org/au-research/grants/arc/DP160103387 http://creativecommons.org/licenses/by/4.0/ AMER GEOPHYSICAL UNION fulltext |
| spellingShingle | Science & Technology Physical Sciences Meteorology & Atmospheric Sciences Atmospheric aerosols bioaerosols fluorescent aerosols marine aerosols sea spray aerosols Southern Ocean SEA SPRAY AEROSOL CLOUD CONDENSATION NUCLEI ICE NUCLEI AIRBORNE OBSERVATIONS MARINE AEROSOLS ORGANIC-MATTER BIOAEROSOL FOREST DISTRIBUTIONS MICROSCOPY Atmospheric aerosols Southern Ocean bioaerosols fluorescent aerosols marine aerosols sea spray aerosols Moallemi, A. Landwehr, S. Robinson, Charlotte Simó, R. Zamanillo, M. Chen, G. Baccarini, A. Schnaiter, M. Henning, S. Modini, R.L. Gysel-Beer, M. Schmale, J. Sources, Occurrence and Characteristics of Fluorescent Biological Aerosol Particles Measured Over the Pristine Southern Ocean |
| title | 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_short | 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 |
| topic | Science & Technology Physical Sciences Meteorology & Atmospheric Sciences Atmospheric aerosols bioaerosols fluorescent aerosols marine aerosols sea spray aerosols Southern Ocean SEA SPRAY AEROSOL CLOUD CONDENSATION NUCLEI ICE NUCLEI AIRBORNE OBSERVATIONS MARINE AEROSOLS ORGANIC-MATTER BIOAEROSOL FOREST DISTRIBUTIONS MICROSCOPY Atmospheric aerosols Southern Ocean bioaerosols fluorescent aerosols marine aerosols sea spray aerosols |
| url | http://purl.org/au-research/grants/arc/DP160103387 http://hdl.handle.net/20.500.11937/91008 |