Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse
Measurements of aerosol number concentrations and direct aerosol sampling were conducted on continental Antarctica during the traverse of the Japanese-Swedish joint Antarctic expedition (JASE) from 14 November 2007 until 24 January 2008. Aerosol concentrations in background conditions decreased grad...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/57657 2023-05-15T13:40:56+02:00 Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse Hara, K. Nakazawa, F. Fujita, S. Fukui, K. Enomoto, H. Sugiyama, S. http://hdl.handle.net/2115/57657 https://doi.org/10.5194/acp-14-10211-2014 eng eng Copernicus Gesellschaft http://hdl.handle.net/2115/57657 Atmospheric Chemistry and Physics, 14(18): 10211-10230 http://dx.doi.org/10.5194/acp-14-10211-2014 http://creativecommons.org/licenses/by/3.0/ CC-BY 519 article fthokunivhus https://doi.org/10.5194/acp-14-10211-2014 2022-11-18T01:03:21Z Measurements of aerosol number concentrations and direct aerosol sampling were conducted on continental Antarctica during the traverse of the Japanese-Swedish joint Antarctic expedition (JASE) from 14 November 2007 until 24 January 2008. Aerosol concentrations in background conditions decreased gradually with latitude in inland regions during the traverse. The lowest aerosol number concentrations were 160 L-1 in D-p > 0.3 mu m, and 0.5 L-1 in Dp > 2 mu m. In contrast, aerosol concentrations reached 3278 L-1 in Dp > 0.3 mu m, and 215 L-1 in Dp > 2 mu m under strong wind conditions. The estimated aerosol mass concentrations were 0.04-5.7 mu gm(-3). Single particle analysis of aerosol particles collected during the JASE traverse was conducted using a scanning electron microscope equipped with an energy dispersive x ray spectrometer. Major aerosol constituents were sulfates in fine mode, and sulfate, sea salts, modified sea salts, and fractionated sea salts in coarse mode. K-rich sulfates, Mg-rich sulfate, Ca-rich sulfates, and minerals were identified as minor aerosol constituents. Horizontal features of Cl/Na ratios imply that sea-salt modification (i.e. Cl loss) occurred on the Antarctic continent during the summer. Most sea-salt particles in the continental region near the coast were modified with acidic sulfur species such as H2SO4 and CH3SO3H. By contrast, acidic species other than the acidic sulfur species (likely HNO3) contributed markedly to sea-salt modification in inland areas during the traverse. Mg-rich sea-salt particles and Mg-free sea-salt particles were present in coarse and fine modes from the coast to inland areas. These sea-salt particles might be associated with sea-salt fractionation on the snow surface of continental Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic The Antarctic Atmospheric Chemistry and Physics 14 18 10211 10230 |
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Open Polar |
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Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
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fthokunivhus |
language |
English |
topic |
519 |
spellingShingle |
519 Hara, K. Nakazawa, F. Fujita, S. Fukui, K. Enomoto, H. Sugiyama, S. Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse |
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description |
Measurements of aerosol number concentrations and direct aerosol sampling were conducted on continental Antarctica during the traverse of the Japanese-Swedish joint Antarctic expedition (JASE) from 14 November 2007 until 24 January 2008. Aerosol concentrations in background conditions decreased gradually with latitude in inland regions during the traverse. The lowest aerosol number concentrations were 160 L-1 in D-p > 0.3 mu m, and 0.5 L-1 in Dp > 2 mu m. In contrast, aerosol concentrations reached 3278 L-1 in Dp > 0.3 mu m, and 215 L-1 in Dp > 2 mu m under strong wind conditions. The estimated aerosol mass concentrations were 0.04-5.7 mu gm(-3). Single particle analysis of aerosol particles collected during the JASE traverse was conducted using a scanning electron microscope equipped with an energy dispersive x ray spectrometer. Major aerosol constituents were sulfates in fine mode, and sulfate, sea salts, modified sea salts, and fractionated sea salts in coarse mode. K-rich sulfates, Mg-rich sulfate, Ca-rich sulfates, and minerals were identified as minor aerosol constituents. Horizontal features of Cl/Na ratios imply that sea-salt modification (i.e. Cl loss) occurred on the Antarctic continent during the summer. Most sea-salt particles in the continental region near the coast were modified with acidic sulfur species such as H2SO4 and CH3SO3H. By contrast, acidic species other than the acidic sulfur species (likely HNO3) contributed markedly to sea-salt modification in inland areas during the traverse. Mg-rich sea-salt particles and Mg-free sea-salt particles were present in coarse and fine modes from the coast to inland areas. These sea-salt particles might be associated with sea-salt fractionation on the snow surface of continental Antarctica. |
format |
Article in Journal/Newspaper |
author |
Hara, K. Nakazawa, F. Fujita, S. Fukui, K. Enomoto, H. Sugiyama, S. |
author_facet |
Hara, K. Nakazawa, F. Fujita, S. Fukui, K. Enomoto, H. Sugiyama, S. |
author_sort |
Hara, K. |
title |
Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse |
title_short |
Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse |
title_full |
Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse |
title_fullStr |
Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse |
title_full_unstemmed |
Horizontal distributions of aerosol constituents and their mixing states in Antarctica during the JASE traverse |
title_sort |
horizontal distributions of aerosol constituents and their mixing states in antarctica during the jase traverse |
publisher |
Copernicus Gesellschaft |
url |
http://hdl.handle.net/2115/57657 https://doi.org/10.5194/acp-14-10211-2014 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://hdl.handle.net/2115/57657 Atmospheric Chemistry and Physics, 14(18): 10211-10230 http://dx.doi.org/10.5194/acp-14-10211-2014 |
op_rights |
http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/acp-14-10211-2014 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
14 |
container_issue |
18 |
container_start_page |
10211 |
op_container_end_page |
10230 |
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1766143466589388800 |