气候变化领域集成服务门户(CCPortal): Seasonal features and origins of carbonaceous aerosols at Syowa Station; coastal Antarctica

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DOI	10.5194/acp-19-7817-2019
	Seasonal features and origins of carbonaceous aerosols at Syowa Station; coastal Antarctica
	Hara K.; Sudo K.; Ohnishi T.; Osada K.; Yabuki M.; Shiobara M.; Yamanouchi T.
发表日期	2019
ISSN	16807316
起始页码	7817
结束页码	7837
卷号	19 期号:11
英文摘要	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. © 2019 Author(s).
语种	英语
scopus关键词	aerosol; aerosol composition; air mass; black carbon; boundary layer; concentration (composition); fossil fuel; long range transport; midlatitude environment; seasonal variation; trajectory; troposphere; Africa; Antarctica; East Antarctica; South America; Syowa Station
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144343
作者单位	Department of Earth System Science, Faculty of Science, Fukuoka University, Fukuoka, 814-0180, Japan; Graduate School of Environmental Studies, Nagoya University, Nagoya, 464-8601, Japan; Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, 611-0011, Japan; National Institute of Polar Research, Tokyo, 190-0014, Japan
推荐引用方式 GB/T 7714	Hara K.,Sudo K.,Ohnishi T.,et al. Seasonal features and origins of carbonaceous aerosols at Syowa Station; coastal Antarctica[J],2019,19(11).
APA	Hara K..,Sudo K..,Ohnishi T..,Osada K..,Yabuki M..,...&Yamanouchi T..(2019).Seasonal features and origins of carbonaceous aerosols at Syowa Station; coastal Antarctica.Atmospheric Chemistry and Physics,19(11).
MLA	Hara K.,et al."Seasonal features and origins of carbonaceous aerosols at Syowa Station; coastal Antarctica".Atmospheric Chemistry and Physics 19.11(2019).