Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer
The impact of aerosols on clouds is a well-studied, although still poorly constrained, part of the atmospheric system. New particle formation (NPF) is thought to contribute 40 %–80 % of the global cloud droplet number concentration, although it is extremely difficult to observe an air mass from NPF...
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ftcopernicus:oai:publications.copernicus.org:acp98769 2023-05-15T14:29:00+02:00 Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer Chang, Rachel Y.-W. Abbatt, Jonathan P. D. Boyer, Matthew C. Chaubey, Jai Prakash Collins, Douglas B. 2022-06-22 application/pdf https://doi.org/10.5194/acp-22-8059-2022 https://acp.copernicus.org/articles/22/8059/2022/ eng eng doi:10.5194/acp-22-8059-2022 https://acp.copernicus.org/articles/22/8059/2022/ eISSN: 1680-7324 Text 2022 ftcopernicus https://doi.org/10.5194/acp-22-8059-2022 2022-06-27T16:22:42Z The impact of aerosols on clouds is a well-studied, although still poorly constrained, part of the atmospheric system. New particle formation (NPF) is thought to contribute 40 %–80 % of the global cloud droplet number concentration, although it is extremely difficult to observe an air mass from NPF to cloud formation. NPF and growth occurs frequently in the Canadian Arctic summer atmosphere, although only a few studies have characterized the source and properties of these aerosols. This study presents cloud condensation nuclei (CCN) concentrations measured on board the CCGS Amundsen in the eastern Canadian Arctic Archipelago from 23 July to 23 August 2016 as part of the Network on Climate and Aerosols: Addressing Uncertainties in Remote Canadian Environments (NETCARE). The study was dominated by frequent ultrafine particle and/or growth events, and particles smaller than 100 nm dominated the size distribution for 92 % of the study period. Using κ -Köhler theory and aerosol size distributions, the mean hygroscopicity parameter ( κ ) calculated for the entire study was 0.12 (0.06–0.12, 25th–75th percentile), suggesting that the condensable vapours that led to particle growth were primarily slightly hygroscopic, which we infer to be organic. Based on past measurement and modelling studies from NETCARE and the Canadian Arctic, it seems likely that the source of these slightly hygroscopic, organic, vapours is the ocean. Examining specific growth events suggests that the mode diameter ( D max ) had to exceed 40 nm before CCN concentrations at 0.99 % supersaturation (SS) started to increase, although a statistical analysis shows that CCN concentrations increased 13–274 cm −3 during all ultrafine particle and/or growth times (total particle concentrations >500 cm −3 , D max <100 nm) compared with background times (total concentrations <500 cm −3 ) at SS of 0.26 %–0.99 %. This value increased to 25–425 cm −3 if the growth times were limited to times when D max was also larger than 40 nm. These results support ... Text Arctic Archipelago Arctic Canadian Arctic Archipelago Copernicus Publications: E-Journals Arctic Canadian Arctic Archipelago Atmospheric Chemistry and Physics 22 12 8059 8071 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
The impact of aerosols on clouds is a well-studied, although still poorly constrained, part of the atmospheric system. New particle formation (NPF) is thought to contribute 40 %–80 % of the global cloud droplet number concentration, although it is extremely difficult to observe an air mass from NPF to cloud formation. NPF and growth occurs frequently in the Canadian Arctic summer atmosphere, although only a few studies have characterized the source and properties of these aerosols. This study presents cloud condensation nuclei (CCN) concentrations measured on board the CCGS Amundsen in the eastern Canadian Arctic Archipelago from 23 July to 23 August 2016 as part of the Network on Climate and Aerosols: Addressing Uncertainties in Remote Canadian Environments (NETCARE). The study was dominated by frequent ultrafine particle and/or growth events, and particles smaller than 100 nm dominated the size distribution for 92 % of the study period. Using κ -Köhler theory and aerosol size distributions, the mean hygroscopicity parameter ( κ ) calculated for the entire study was 0.12 (0.06–0.12, 25th–75th percentile), suggesting that the condensable vapours that led to particle growth were primarily slightly hygroscopic, which we infer to be organic. Based on past measurement and modelling studies from NETCARE and the Canadian Arctic, it seems likely that the source of these slightly hygroscopic, organic, vapours is the ocean. Examining specific growth events suggests that the mode diameter ( D max ) had to exceed 40 nm before CCN concentrations at 0.99 % supersaturation (SS) started to increase, although a statistical analysis shows that CCN concentrations increased 13–274 cm −3 during all ultrafine particle and/or growth times (total particle concentrations >500 cm −3 , D max <100 nm) compared with background times (total concentrations <500 cm −3 ) at SS of 0.26 %–0.99 %. This value increased to 25–425 cm −3 if the growth times were limited to times when D max was also larger than 40 nm. These results support ... |
format |
Text |
author |
Chang, Rachel Y.-W. Abbatt, Jonathan P. D. Boyer, Matthew C. Chaubey, Jai Prakash Collins, Douglas B. |
spellingShingle |
Chang, Rachel Y.-W. Abbatt, Jonathan P. D. Boyer, Matthew C. Chaubey, Jai Prakash Collins, Douglas B. Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer |
author_facet |
Chang, Rachel Y.-W. Abbatt, Jonathan P. D. Boyer, Matthew C. Chaubey, Jai Prakash Collins, Douglas B. |
author_sort |
Chang, Rachel Y.-W. |
title |
Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer |
title_short |
Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer |
title_full |
Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer |
title_fullStr |
Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer |
title_full_unstemmed |
Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer |
title_sort |
characterizing the hygroscopicity of growing particles in the canadian arctic summer |
publishDate |
2022 |
url |
https://doi.org/10.5194/acp-22-8059-2022 https://acp.copernicus.org/articles/22/8059/2022/ |
geographic |
Arctic Canadian Arctic Archipelago |
geographic_facet |
Arctic Canadian Arctic Archipelago |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-22-8059-2022 https://acp.copernicus.org/articles/22/8059/2022/ |
op_doi |
https://doi.org/10.5194/acp-22-8059-2022 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
22 |
container_issue |
12 |
container_start_page |
8059 |
op_container_end_page |
8071 |
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1766303108300800000 |