Summer aerosol measurements over the East Antarctic seasonal ice zone
Aerosol measurements over the Southern Ocean have been identified as critical to an improved understanding of aerosol–radiation and aerosol–cloud interactions, as there currently exists significant discrepancies between model results and measurements in this region. The atmosphere above the Southern...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00057112 2024-09-15T17:47:37+00:00 Summer aerosol measurements over the East Antarctic seasonal ice zone Simmons, Jack B. Humphries, Ruhi S. Wilson, Stephen R. Chambers, Scott D. Williams, Alastair G. Griffiths, Alan D. McRobert, Ian M. Ward, Jason P. Keywood, Melita D. Gribben, Sean 2021-06 electronic https://doi.org/10.5194/acp-21-9497-2021 https://noa.gwlb.de/receive/cop_mods_00057112 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056762/acp-21-9497-2021.pdf https://acp.copernicus.org/articles/21/9497/2021/acp-21-9497-2021.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-21-9497-2021 https://noa.gwlb.de/receive/cop_mods_00057112 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056762/acp-21-9497-2021.pdf https://acp.copernicus.org/articles/21/9497/2021/acp-21-9497-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/acp-21-9497-2021 2024-06-26T04:38:21Z Aerosol measurements over the Southern Ocean have been identified as critical to an improved understanding of aerosol–radiation and aerosol–cloud interactions, as there currently exists significant discrepancies between model results and measurements in this region. The atmosphere above the Southern Ocean provides crucial insight into an aerosol regime relatively free from anthropogenic influence, yet its remoteness ensures atmospheric measurements are relatively rare. Here we present observations from the Polar Cell Aerosol Nucleation (PCAN) campaign, hosted aboard the RV Investigator during a summer (January–March) 2017 voyage from Hobart, Australia, to the East Antarctic seasonal sea ice zone. A median particle number concentration (condensation nuclei > 3 nm; CN3) of 354 (95 % CI 345–363) cm−3 was observed from the voyage. Median cloud condensation nuclei (CCN) concentrations were 167 (95 % CI 158–176) cm−3. Measured particle size distributions suggested that aerosol populations had undergone significant cloud processing. To understand the variability in aerosol observations, measurements were classified by meteorological variables. Wind direction and absolute humidity were used to identify different air masses, and aerosol measurements were compared based on these identifications. CN3 concentrations measured during SE wind directions (median 594 cm−3) were higher than those measured during wind directions from the NW (median 265 cm−3). Increased frequency of measurements from these wind directions suggests the influence of large-scale atmospheric transport mechanisms on the local aerosol population in the boundary layer of the East Antarctic seasonal ice zone. Modelled back trajectories imply different air mass histories for each measurement group, supporting this suggestion. CN3 and CCN concentrations were higher during periods where the absolute humidity was less than 4.3 g H2O/m3, indicative of free tropospheric or Antarctic continental air masses, compared to other periods of the voyage. Increased ... Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Niedersächsisches Online-Archiv NOA Atmospheric Chemistry and Physics 21 12 9497 9513 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Simmons, Jack B. Humphries, Ruhi S. Wilson, Stephen R. Chambers, Scott D. Williams, Alastair G. Griffiths, Alan D. McRobert, Ian M. Ward, Jason P. Keywood, Melita D. Gribben, Sean Summer aerosol measurements over the East Antarctic seasonal ice zone |
topic_facet |
article Verlagsveröffentlichung |
description |
Aerosol measurements over the Southern Ocean have been identified as critical to an improved understanding of aerosol–radiation and aerosol–cloud interactions, as there currently exists significant discrepancies between model results and measurements in this region. The atmosphere above the Southern Ocean provides crucial insight into an aerosol regime relatively free from anthropogenic influence, yet its remoteness ensures atmospheric measurements are relatively rare. Here we present observations from the Polar Cell Aerosol Nucleation (PCAN) campaign, hosted aboard the RV Investigator during a summer (January–March) 2017 voyage from Hobart, Australia, to the East Antarctic seasonal sea ice zone. A median particle number concentration (condensation nuclei > 3 nm; CN3) of 354 (95 % CI 345–363) cm−3 was observed from the voyage. Median cloud condensation nuclei (CCN) concentrations were 167 (95 % CI 158–176) cm−3. Measured particle size distributions suggested that aerosol populations had undergone significant cloud processing. To understand the variability in aerosol observations, measurements were classified by meteorological variables. Wind direction and absolute humidity were used to identify different air masses, and aerosol measurements were compared based on these identifications. CN3 concentrations measured during SE wind directions (median 594 cm−3) were higher than those measured during wind directions from the NW (median 265 cm−3). Increased frequency of measurements from these wind directions suggests the influence of large-scale atmospheric transport mechanisms on the local aerosol population in the boundary layer of the East Antarctic seasonal ice zone. Modelled back trajectories imply different air mass histories for each measurement group, supporting this suggestion. CN3 and CCN concentrations were higher during periods where the absolute humidity was less than 4.3 g H2O/m3, indicative of free tropospheric or Antarctic continental air masses, compared to other periods of the voyage. Increased ... |
format |
Article in Journal/Newspaper |
author |
Simmons, Jack B. Humphries, Ruhi S. Wilson, Stephen R. Chambers, Scott D. Williams, Alastair G. Griffiths, Alan D. McRobert, Ian M. Ward, Jason P. Keywood, Melita D. Gribben, Sean |
author_facet |
Simmons, Jack B. Humphries, Ruhi S. Wilson, Stephen R. Chambers, Scott D. Williams, Alastair G. Griffiths, Alan D. McRobert, Ian M. Ward, Jason P. Keywood, Melita D. Gribben, Sean |
author_sort |
Simmons, Jack B. |
title |
Summer aerosol measurements over the East Antarctic seasonal ice zone |
title_short |
Summer aerosol measurements over the East Antarctic seasonal ice zone |
title_full |
Summer aerosol measurements over the East Antarctic seasonal ice zone |
title_fullStr |
Summer aerosol measurements over the East Antarctic seasonal ice zone |
title_full_unstemmed |
Summer aerosol measurements over the East Antarctic seasonal ice zone |
title_sort |
summer aerosol measurements over the east antarctic seasonal ice zone |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/acp-21-9497-2021 https://noa.gwlb.de/receive/cop_mods_00057112 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056762/acp-21-9497-2021.pdf https://acp.copernicus.org/articles/21/9497/2021/acp-21-9497-2021.pdf |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-21-9497-2021 https://noa.gwlb.de/receive/cop_mods_00057112 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00056762/acp-21-9497-2021.pdf https://acp.copernicus.org/articles/21/9497/2021/acp-21-9497-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-21-9497-2021 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
21 |
container_issue |
12 |
container_start_page |
9497 |
op_container_end_page |
9513 |
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1810497067613683712 |