Ice nucleating particles in the marine boundary layer in the Canadian Arctic during summer 2014
Ice nucleating particles (INPs) in the Arctic can influence climate and precipitation in the region; yet our understanding of the concentrations and sources of INPs in this region remain uncertain. In the following, we (1) measured concentrations of INPs in the immersion mode in the Canadian Arctic...
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ftcopernicus:oai:publications.copernicus.org:acp70458 2023-05-15T14:52:58+02:00 Ice nucleating particles in the marine boundary layer in the Canadian Arctic during summer 2014 Irish, Victoria E. Hanna, Sarah J. Willis, Megan D. China, Swarup Thomas, Jennie L. Wentzell, Jeremy J. B. Cirisan, Ana Si, Meng Leaitch, W. Richard Murphy, Jennifer G. Abbatt, Jonathan P. D. Laskin, Alexander Girard, Eric Bertram, Allan K. 2019-01-25 application/pdf https://doi.org/10.5194/acp-19-1027-2019 https://www.atmos-chem-phys.net/19/1027/2019/ eng eng doi:10.5194/acp-19-1027-2019 https://www.atmos-chem-phys.net/19/1027/2019/ eISSN: 1680-7324 Text 2019 ftcopernicus https://doi.org/10.5194/acp-19-1027-2019 2019-12-24T09:49:31Z Ice nucleating particles (INPs) in the Arctic can influence climate and precipitation in the region; yet our understanding of the concentrations and sources of INPs in this region remain uncertain. In the following, we (1) measured concentrations of INPs in the immersion mode in the Canadian Arctic marine boundary layer during summer 2014 on board the CCGS Amundsen , (2) determined ratios of surface areas of mineral dust aerosol to sea spray aerosol, and (3) investigated the source region of the INPs using particle dispersion modelling. Average concentrations of INPs at −15 , −20 , and −25 ∘ C were 0.005, 0.044, and 0.154 L −1 , respectively. These concentrations fall within the range of INP concentrations measured in other marine environments. For the samples investigated the ratio of mineral dust surface area to sea spray surface area ranged from 0.03 to 0.09. Based on these ratios and the ice active surface site densities of mineral dust and sea spray aerosol determined in previous laboratory studies, our results suggest that mineral dust is a more important contributor to the INP population than sea spray aerosol for the samples analysed. Based on particle dispersion modelling, the highest concentrations of INPs were often associated with lower-latitude source regions such as the Hudson Bay area, eastern Greenland, or north-western continental Canada. On the other hand, the lowest concentrations were often associated with regions further north of the sampling sites and over Baffin Bay. A weak correlation was observed between INP concentrations and the time the air mass spent over bare land, and a weak negative correlation was observed between INP concentrations and the time the air mass spent over ice and open water. These combined results suggest that mineral dust from local sources is an important contributor to the INP population in the Canadian Arctic marine boundary layer during summer 2014. Text Arctic Baffin Bay Baffin Bay Baffin Greenland Hudson Bay Copernicus Publications: E-Journals Arctic Baffin Bay Canada Greenland Hudson Hudson Bay Atmospheric Chemistry and Physics 19 2 1027 1039 |
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Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Ice nucleating particles (INPs) in the Arctic can influence climate and precipitation in the region; yet our understanding of the concentrations and sources of INPs in this region remain uncertain. In the following, we (1) measured concentrations of INPs in the immersion mode in the Canadian Arctic marine boundary layer during summer 2014 on board the CCGS Amundsen , (2) determined ratios of surface areas of mineral dust aerosol to sea spray aerosol, and (3) investigated the source region of the INPs using particle dispersion modelling. Average concentrations of INPs at −15 , −20 , and −25 ∘ C were 0.005, 0.044, and 0.154 L −1 , respectively. These concentrations fall within the range of INP concentrations measured in other marine environments. For the samples investigated the ratio of mineral dust surface area to sea spray surface area ranged from 0.03 to 0.09. Based on these ratios and the ice active surface site densities of mineral dust and sea spray aerosol determined in previous laboratory studies, our results suggest that mineral dust is a more important contributor to the INP population than sea spray aerosol for the samples analysed. Based on particle dispersion modelling, the highest concentrations of INPs were often associated with lower-latitude source regions such as the Hudson Bay area, eastern Greenland, or north-western continental Canada. On the other hand, the lowest concentrations were often associated with regions further north of the sampling sites and over Baffin Bay. A weak correlation was observed between INP concentrations and the time the air mass spent over bare land, and a weak negative correlation was observed between INP concentrations and the time the air mass spent over ice and open water. These combined results suggest that mineral dust from local sources is an important contributor to the INP population in the Canadian Arctic marine boundary layer during summer 2014. |
format |
Text |
author |
Irish, Victoria E. Hanna, Sarah J. Willis, Megan D. China, Swarup Thomas, Jennie L. Wentzell, Jeremy J. B. Cirisan, Ana Si, Meng Leaitch, W. Richard Murphy, Jennifer G. Abbatt, Jonathan P. D. Laskin, Alexander Girard, Eric Bertram, Allan K. |
spellingShingle |
Irish, Victoria E. Hanna, Sarah J. Willis, Megan D. China, Swarup Thomas, Jennie L. Wentzell, Jeremy J. B. Cirisan, Ana Si, Meng Leaitch, W. Richard Murphy, Jennifer G. Abbatt, Jonathan P. D. Laskin, Alexander Girard, Eric Bertram, Allan K. Ice nucleating particles in the marine boundary layer in the Canadian Arctic during summer 2014 |
author_facet |
Irish, Victoria E. Hanna, Sarah J. Willis, Megan D. China, Swarup Thomas, Jennie L. Wentzell, Jeremy J. B. Cirisan, Ana Si, Meng Leaitch, W. Richard Murphy, Jennifer G. Abbatt, Jonathan P. D. Laskin, Alexander Girard, Eric Bertram, Allan K. |
author_sort |
Irish, Victoria E. |
title |
Ice nucleating particles in the marine boundary layer in the Canadian Arctic during summer 2014 |
title_short |
Ice nucleating particles in the marine boundary layer in the Canadian Arctic during summer 2014 |
title_full |
Ice nucleating particles in the marine boundary layer in the Canadian Arctic during summer 2014 |
title_fullStr |
Ice nucleating particles in the marine boundary layer in the Canadian Arctic during summer 2014 |
title_full_unstemmed |
Ice nucleating particles in the marine boundary layer in the Canadian Arctic during summer 2014 |
title_sort |
ice nucleating particles in the marine boundary layer in the canadian arctic during summer 2014 |
publishDate |
2019 |
url |
https://doi.org/10.5194/acp-19-1027-2019 https://www.atmos-chem-phys.net/19/1027/2019/ |
geographic |
Arctic Baffin Bay Canada Greenland Hudson Hudson Bay |
geographic_facet |
Arctic Baffin Bay Canada Greenland Hudson Hudson Bay |
genre |
Arctic Baffin Bay Baffin Bay Baffin Greenland Hudson Bay |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin Greenland Hudson Bay |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-19-1027-2019 https://www.atmos-chem-phys.net/19/1027/2019/ |
op_doi |
https://doi.org/10.5194/acp-19-1027-2019 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
19 |
container_issue |
2 |
container_start_page |
1027 |
op_container_end_page |
1039 |
_version_ |
1766324370365480960 |