Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica
We have measured black carbon (BC) concentrations at Syowa Station, Antarctica, since February 2005. The measured BC concentrations in 2005–2016 were corrected to equivalent BC (EBC) concentrations using Weingartner's method. Seasonal features of EBC concentrations, long-range transport from mi...
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ftdoajarticles:oai:doaj.org/article:b4cdfd9b2a8d4939875663d6e53f04de 2023-05-15T13:46:53+02:00 Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica K. Hara K. Sudo T. Ohnishi K. Osada M. Yabuki M. Shiobara T. Yamanouchi 2019-06-01T00:00:00Z https://doi.org/10.5194/acp-19-7817-2019 https://doaj.org/article/b4cdfd9b2a8d4939875663d6e53f04de EN eng Copernicus Publications https://www.atmos-chem-phys.net/19/7817/2019/acp-19-7817-2019.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-19-7817-2019 1680-7316 1680-7324 https://doaj.org/article/b4cdfd9b2a8d4939875663d6e53f04de Atmospheric Chemistry and Physics, Vol 19, Pp 7817-7837 (2019) Physics QC1-999 Chemistry QD1-999 article 2019 ftdoajarticles https://doi.org/10.5194/acp-19-7817-2019 2022-12-31T11:22:28Z We have measured black carbon (BC) concentrations at Syowa Station, Antarctica, since February 2005. The measured BC concentrations in 2005–2016 were corrected to equivalent BC (EBC) concentrations using Weingartner's method. Seasonal features of EBC concentrations, long-range transport from mid-latitudes to the Antarctic coast, and their origins were characterized. Results show that daily median EBC concentrations were below the detection limit (0.2 ng m −3 ) to 63.8 ng m −3 at Syowa Station (median, 1.8 ng m −3 mean, 2.7 ng m −3 during the measurement period of February 2005–December 2016). Although seasonal features and year-to-year variations in EBC concentrations were observed, no long-term trend of EBC concentrations was clear during our measurement period. Seasonal features of EBC concentrations showed a spring maximum during September–October at Syowa Station. To elucidate EBC transport processes, origins, and the potential source area (PSA), we compared EBC data to backward trajectory analysis and chemical transport model simulation. From comparison with backward trajectory, high EBC concentrations were found in air masses from the marine boundary layer. This finding implies that transport via the marine boundary layer was the most important transport pathway to EBC concentrations at Antarctic coasts. Some EBC was supplied to the Antarctic region by transport via the upper free troposphere. Chemical transport model simulation demonstrated that the most important origins and PSA of EBC at Syowa Station were biomass burning in South America and southern Africa. Fossil fuel combustion in South America and southern Africa also have important contributions. The absorption Ångström exponent (AAE) showed clear seasonal features with 0.5–1.0 during April–October and maximum (1.0–1.5) in December–February. The AAE features might be associated with organic aerosols and mixing states of EBC. Article in Journal/Newspaper Antarc* Antarctic Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic Syowa Station The Antarctic Atmospheric Chemistry and Physics 19 11 7817 7837 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
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English |
topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 K. Hara K. Sudo T. Ohnishi K. Osada M. Yabuki M. Shiobara T. Yamanouchi Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
We have measured black carbon (BC) concentrations at Syowa Station, Antarctica, since February 2005. The measured BC concentrations in 2005–2016 were corrected to equivalent BC (EBC) concentrations using Weingartner's method. Seasonal features of EBC concentrations, long-range transport from mid-latitudes to the Antarctic coast, and their origins were characterized. Results show that daily median EBC concentrations were below the detection limit (0.2 ng m −3 ) to 63.8 ng m −3 at Syowa Station (median, 1.8 ng m −3 mean, 2.7 ng m −3 during the measurement period of February 2005–December 2016). Although seasonal features and year-to-year variations in EBC concentrations were observed, no long-term trend of EBC concentrations was clear during our measurement period. Seasonal features of EBC concentrations showed a spring maximum during September–October at Syowa Station. To elucidate EBC transport processes, origins, and the potential source area (PSA), we compared EBC data to backward trajectory analysis and chemical transport model simulation. From comparison with backward trajectory, high EBC concentrations were found in air masses from the marine boundary layer. This finding implies that transport via the marine boundary layer was the most important transport pathway to EBC concentrations at Antarctic coasts. Some EBC was supplied to the Antarctic region by transport via the upper free troposphere. Chemical transport model simulation demonstrated that the most important origins and PSA of EBC at Syowa Station were biomass burning in South America and southern Africa. Fossil fuel combustion in South America and southern Africa also have important contributions. The absorption Ångström exponent (AAE) showed clear seasonal features with 0.5–1.0 during April–October and maximum (1.0–1.5) in December–February. The AAE features might be associated with organic aerosols and mixing states of EBC. |
format |
Article in Journal/Newspaper |
author |
K. Hara K. Sudo T. Ohnishi K. Osada M. Yabuki M. Shiobara T. Yamanouchi |
author_facet |
K. Hara K. Sudo T. Ohnishi K. Osada M. Yabuki M. Shiobara T. Yamanouchi |
author_sort |
K. Hara |
title |
Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica |
title_short |
Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica |
title_full |
Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica |
title_fullStr |
Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica |
title_full_unstemmed |
Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica |
title_sort |
seasonal features and origins of carbonaceous aerosols at syowa station, coastal antarctica |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/acp-19-7817-2019 https://doaj.org/article/b4cdfd9b2a8d4939875663d6e53f04de |
geographic |
Antarctic Syowa Station The Antarctic |
geographic_facet |
Antarctic Syowa Station The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Atmospheric Chemistry and Physics, Vol 19, Pp 7817-7837 (2019) |
op_relation |
https://www.atmos-chem-phys.net/19/7817/2019/acp-19-7817-2019.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-19-7817-2019 1680-7316 1680-7324 https://doaj.org/article/b4cdfd9b2a8d4939875663d6e53f04de |
op_doi |
https://doi.org/10.5194/acp-19-7817-2019 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
19 |
container_issue |
11 |
container_start_page |
7817 |
op_container_end_page |
7837 |
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1766245509765267456 |