Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition
During summer, the Southern Ocean is largely unaffected by anthropogenic emissions, which makes this region an ideal place to investigate marine natural aerosol sources and processes. A better understanding of natural aerosol is key to constrain the preindustrial aerosol state and reduce the aerosol...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | https://doi.org/10.1029/2021JD035126 https://infoscience.epfl.ch/record/290016/files/2021JD035126.pdf http://infoscience.epfl.ch/record/290016 |
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ftinfoscience:oai:infoscience.epfl.ch:290016 2023-05-15T13:44:32+02:00 Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition Baccarini, Andrea Dommen, Josef Lehtipalo, Katrianne Henning, Silvia Modini, Robin L. Gysel‐Beer, Martin Baltensperger, Urs Schmale, Julia 2021-11-11T12:29:40Z https://doi.org/10.1029/2021JD035126 https://infoscience.epfl.ch/record/290016/files/2021JD035126.pdf http://infoscience.epfl.ch/record/290016 unknown doi:10.1029/2021JD035126 https://infoscience.epfl.ch/record/290016/files/2021JD035126.pdf http://infoscience.epfl.ch/record/290016 http://infoscience.epfl.ch/record/290016 Text 2021 ftinfoscience https://doi.org/10.1029/2021JD035126 2023-02-13T23:07:34Z During summer, the Southern Ocean is largely unaffected by anthropogenic emissions, which makes this region an ideal place to investigate marine natural aerosol sources and processes. A better understanding of natural aerosol is key to constrain the preindustrial aerosol state and reduce the aerosol radiative forcing uncertainty in global climate models. We report the concentrations of gaseous sulfuric acid, iodic acid, and methanesulfonic acid (MSA) together with a characterization of new particle formation (NPF) events over a large stretch of the Southern Ocean. Measurements were conducted on board the Russian icebreaker Akademik Tryoshnikov from January to March 2017. Iodic acid is characterized by a particular diurnal cycle with reduced concentration around noon, suggesting a lower formation yield when solar irradiance is higher. Gaseous MSA does not have a diurnal cycle and measured concentrations in gas and condensed phase are compatible with this species being primarily produced via heterogeneous oxidation of dimethyl sulfide and subsequent partitioning into the gas phase. We also found that NPF in the boundary layer is mainly driven by sulfuric acid but it occurred very rarely over the vast geographical area probed and did not contribute to the cloud condensation nuclei budget in a directly observable manner. Despite the near absence of NPF events in the boundary layer, Aitken mode particles were frequently measured, supporting the hypothesis of a free tropospheric source. Iodic acid and MSA were not found to participate in nucleation, however, MSA may contribute to aerosol growth via heterogeneous formation in the aqueous phase. Text Antarc* Antarctic Southern Ocean EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) Aitken ENVELOPE(-44.516,-44.516,-60.733,-60.733) Antarctic Southern Ocean The Antarctic Journal of Geophysical Research: Atmospheres 126 22 |
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Open Polar |
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EPFL Infoscience (Ecole Polytechnique Fédérale Lausanne) |
op_collection_id |
ftinfoscience |
language |
unknown |
description |
During summer, the Southern Ocean is largely unaffected by anthropogenic emissions, which makes this region an ideal place to investigate marine natural aerosol sources and processes. A better understanding of natural aerosol is key to constrain the preindustrial aerosol state and reduce the aerosol radiative forcing uncertainty in global climate models. We report the concentrations of gaseous sulfuric acid, iodic acid, and methanesulfonic acid (MSA) together with a characterization of new particle formation (NPF) events over a large stretch of the Southern Ocean. Measurements were conducted on board the Russian icebreaker Akademik Tryoshnikov from January to March 2017. Iodic acid is characterized by a particular diurnal cycle with reduced concentration around noon, suggesting a lower formation yield when solar irradiance is higher. Gaseous MSA does not have a diurnal cycle and measured concentrations in gas and condensed phase are compatible with this species being primarily produced via heterogeneous oxidation of dimethyl sulfide and subsequent partitioning into the gas phase. We also found that NPF in the boundary layer is mainly driven by sulfuric acid but it occurred very rarely over the vast geographical area probed and did not contribute to the cloud condensation nuclei budget in a directly observable manner. Despite the near absence of NPF events in the boundary layer, Aitken mode particles were frequently measured, supporting the hypothesis of a free tropospheric source. Iodic acid and MSA were not found to participate in nucleation, however, MSA may contribute to aerosol growth via heterogeneous formation in the aqueous phase. |
format |
Text |
author |
Baccarini, Andrea Dommen, Josef Lehtipalo, Katrianne Henning, Silvia Modini, Robin L. Gysel‐Beer, Martin Baltensperger, Urs Schmale, Julia |
spellingShingle |
Baccarini, Andrea Dommen, Josef Lehtipalo, Katrianne Henning, Silvia Modini, Robin L. Gysel‐Beer, Martin Baltensperger, Urs Schmale, Julia Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition |
author_facet |
Baccarini, Andrea Dommen, Josef Lehtipalo, Katrianne Henning, Silvia Modini, Robin L. Gysel‐Beer, Martin Baltensperger, Urs Schmale, Julia |
author_sort |
Baccarini, Andrea |
title |
Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition |
title_short |
Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition |
title_full |
Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition |
title_fullStr |
Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition |
title_full_unstemmed |
Low‐Volatility Vapors and New Particle Formation Over the Southern Ocean During the Antarctic Circumnavigation Expedition |
title_sort |
low‐volatility vapors and new particle formation over the southern ocean during the antarctic circumnavigation expedition |
publishDate |
2021 |
url |
https://doi.org/10.1029/2021JD035126 https://infoscience.epfl.ch/record/290016/files/2021JD035126.pdf http://infoscience.epfl.ch/record/290016 |
long_lat |
ENVELOPE(-44.516,-44.516,-60.733,-60.733) |
geographic |
Aitken Antarctic Southern Ocean The Antarctic |
geographic_facet |
Aitken Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
http://infoscience.epfl.ch/record/290016 |
op_relation |
doi:10.1029/2021JD035126 https://infoscience.epfl.ch/record/290016/files/2021JD035126.pdf http://infoscience.epfl.ch/record/290016 |
op_doi |
https://doi.org/10.1029/2021JD035126 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
126 |
container_issue |
22 |
_version_ |
1766202873342853120 |