Circum-Antarctic abundance and properties of CCN and INPs
Aerosol particles acting as cloud condensation nuclei (CCN) or ice-nucleating particles (INPs) play a major role in the formation and glaciation of clouds. Thereby they exert a strong impact on the radiation budget of the Earth. Data on abundance and properties of both types of particles are sparse,...
Published in: | Atmospheric Chemistry and Physics |
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Online Access: | https://doi.org/10.5194/acp-22-9721-2022 https://acp.copernicus.org/articles/22/9721/2022/ |
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ftcopernicus:oai:publications.copernicus.org:acp97050 2023-05-15T13:38:41+02:00 Circum-Antarctic abundance and properties of CCN and INPs Tatzelt, Christian Henning, Silvia Welti, André Baccarini, Andrea Hartmann, Markus Gysel-Beer, Martin Pinxteren, Manuela Modini, Robin L. Schmale, Julia Stratmann, Frank 2022-07-29 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/acp-22-9721-2022 https://acp.copernicus.org/articles/22/9721/2022/ eng eng info:eu-repo/grantAgreement/EC/FP7/603445 doi:10.5194/acp-22-9721-2022 https://acp.copernicus.org/articles/22/9721/2022/ info:eu-repo/semantics/openAccess eISSN: 1680-7324 info:eu-repo/semantics/Text 2022 ftcopernicus https://doi.org/10.5194/acp-22-9721-2022 2022-08-01T16:22:41Z Aerosol particles acting as cloud condensation nuclei (CCN) or ice-nucleating particles (INPs) play a major role in the formation and glaciation of clouds. Thereby they exert a strong impact on the radiation budget of the Earth. Data on abundance and properties of both types of particles are sparse, especially for remote areas of the world, such as the Southern Ocean (SO). In this work, we present unique results from ship-borne aerosol-particle-related in situ measurements and filter sampling in the SO region, carried out during the Antarctic Circumnavigation Expedition (ACE) in the austral summer of 2016–2017. An overview of CCN and INP concentrations over the Southern Ocean is provided and, using additional quantities, insights regarding possible CCN and INP sources and origins are presented. CCN number concentrations spanned 2 orders of magnitude, e.g. for a supersaturation of 0.3 % values ranged roughly from 3 to 590 cm −3 . CCN showed variable contributions of organic and inorganic material (inter-quartile range of hygroscopicity parameter κ from 0.2 to 0.9 ). No distinct size dependence of κ was apparent, indicating homogeneous composition across sizes (critical dry diameter on average between 30 and 110 nm ). The contribution of sea spray aerosol (SSA) to the CCN number concentration was on average small. Ambient INP number concentrations were measured in the temperature range from −5 to −27 ∘ C using an immersion freezing method. Concentrations spanned up to 3 orders of magnitude, e.g. at −16 ∘ C from 0.2 to 100 m −3 . Elevated values (above 10 m −3 at −16 ∘ C) were measured when the research vessel was in the vicinity of land (excluding Antarctica), with lower and more constant concentrations when at sea. This, along with results of backward-trajectory analyses, hints towards terrestrial and/or coastal INP sources being dominant close to ice-free (non-Antarctic) land. In pristine marine areas INPs may originate from both oceanic sources and/or long-range transport. Sampled aerosol particles (PM 10 ) ... Other/Unknown Material Antarc* Antarctic Antarctica Southern Ocean Copernicus Publications: E-Journals Antarctic Austral Southern Ocean The Antarctic Atmospheric Chemistry and Physics 22 14 9721 9745 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Aerosol particles acting as cloud condensation nuclei (CCN) or ice-nucleating particles (INPs) play a major role in the formation and glaciation of clouds. Thereby they exert a strong impact on the radiation budget of the Earth. Data on abundance and properties of both types of particles are sparse, especially for remote areas of the world, such as the Southern Ocean (SO). In this work, we present unique results from ship-borne aerosol-particle-related in situ measurements and filter sampling in the SO region, carried out during the Antarctic Circumnavigation Expedition (ACE) in the austral summer of 2016–2017. An overview of CCN and INP concentrations over the Southern Ocean is provided and, using additional quantities, insights regarding possible CCN and INP sources and origins are presented. CCN number concentrations spanned 2 orders of magnitude, e.g. for a supersaturation of 0.3 % values ranged roughly from 3 to 590 cm −3 . CCN showed variable contributions of organic and inorganic material (inter-quartile range of hygroscopicity parameter κ from 0.2 to 0.9 ). No distinct size dependence of κ was apparent, indicating homogeneous composition across sizes (critical dry diameter on average between 30 and 110 nm ). The contribution of sea spray aerosol (SSA) to the CCN number concentration was on average small. Ambient INP number concentrations were measured in the temperature range from −5 to −27 ∘ C using an immersion freezing method. Concentrations spanned up to 3 orders of magnitude, e.g. at −16 ∘ C from 0.2 to 100 m −3 . Elevated values (above 10 m −3 at −16 ∘ C) were measured when the research vessel was in the vicinity of land (excluding Antarctica), with lower and more constant concentrations when at sea. This, along with results of backward-trajectory analyses, hints towards terrestrial and/or coastal INP sources being dominant close to ice-free (non-Antarctic) land. In pristine marine areas INPs may originate from both oceanic sources and/or long-range transport. Sampled aerosol particles (PM 10 ) ... |
format |
Other/Unknown Material |
author |
Tatzelt, Christian Henning, Silvia Welti, André Baccarini, Andrea Hartmann, Markus Gysel-Beer, Martin Pinxteren, Manuela Modini, Robin L. Schmale, Julia Stratmann, Frank |
spellingShingle |
Tatzelt, Christian Henning, Silvia Welti, André Baccarini, Andrea Hartmann, Markus Gysel-Beer, Martin Pinxteren, Manuela Modini, Robin L. Schmale, Julia Stratmann, Frank Circum-Antarctic abundance and properties of CCN and INPs |
author_facet |
Tatzelt, Christian Henning, Silvia Welti, André Baccarini, Andrea Hartmann, Markus Gysel-Beer, Martin Pinxteren, Manuela Modini, Robin L. Schmale, Julia Stratmann, Frank |
author_sort |
Tatzelt, Christian |
title |
Circum-Antarctic abundance and properties of CCN and INPs |
title_short |
Circum-Antarctic abundance and properties of CCN and INPs |
title_full |
Circum-Antarctic abundance and properties of CCN and INPs |
title_fullStr |
Circum-Antarctic abundance and properties of CCN and INPs |
title_full_unstemmed |
Circum-Antarctic abundance and properties of CCN and INPs |
title_sort |
circum-antarctic abundance and properties of ccn and inps |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-9721-2022 https://acp.copernicus.org/articles/22/9721/2022/ |
geographic |
Antarctic Austral Southern Ocean The Antarctic |
geographic_facet |
Antarctic Austral Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Southern Ocean |
op_source |
eISSN: 1680-7324 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/603445 doi:10.5194/acp-22-9721-2022 https://acp.copernicus.org/articles/22/9721/2022/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-22-9721-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
14 |
container_start_page |
9721 |
op_container_end_page |
9745 |
_version_ |
1766109456693723136 |