A 60 year record of atmospheric aerosol depositions preserved in a high-accumulation dome ice core, southeast Greenland

Iizuka, Yoshinori; Uemura, Ryu; Fujita, Koji; Hattori, Shohei; Seki, Osamu; Miyamoto, Chihiro; Suzuki, Toshitaka; Yoshida, Naohiro; Motoyama, Hideaki; Matoba, Sumito

A 60 year record of atmospheric aerosol depositions preserved in a high-accumulation dome ice core, southeast Greenland

Iizuka, Yoshinori; Uemura, Ryu; Fujita, Koji et al.

Journal of Geophysical Research: Atmospheres, 2018, 123(1), 574-589

Permalink : https://hdl.handle.net/2115/70919

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アクセス権	open access
URI	https://hdl.handle.net/2115/70919
タイトル	A 60 year record of atmospheric aerosol depositions preserved in a high-accumulation dome ice core, southeast Greenland
著者	Iizuka, Yoshinori ; Uemura, Ryu ; Fujita, Koji ; Hattori, Shohei ; Seki, Osamu ; Miyamoto, Chihiro ; Suzuki, Toshitaka ; Yoshida, Naohiro ; Motoyama, Hideaki ; Matoba, Sumito
e-Rad_Researcher 40370043 著者名 Iizuka, Yoshinori
e-Rad_Researcher 00580143 著者名 Uemura, Ryu
e-Rad_Researcher 80303593 著者名 Fujita, Koji
e-Rad_Researcher 70700152 著者名 Hattori, Shohei
e-Rad_Researcher 30374648 著者名 Seki, Osamu
著者名 Miyamoto, Chihiro
e-Rad_Researcher 90202134 著者名 Suzuki, Toshitaka
e-Rad_Researcher 60174942 著者名 Yoshida, Naohiro
e-Rad_Researcher 20210099 著者名 Motoyama, Hideaki
e-Rad_Researcher 30391163 著者名 Matoba, Sumito
言語	英語
キーワード	Anthropogenic Emission
	Ice Core
	Post-Depositional Effect
	Nitrate
	Sulfate
	Greenland
	Isotopic composition and chemistry
	Ice cores
	Chemical and biological geochronology
	Cryospheric change
	Regional climate change
発行日	2018-01-04
出版者	American Geophysical Union
収録物名	Journal of Geophysical Research: Atmospheres
巻(号)	123(1)
ページ	574-589
抄録	The Southeastern Greenland Dome (SE-Dome) has both a high elevation and a high accumulation rate (1.01 m w.e. yr-1), which are suitable properties for reconstructing past environmental changes with a high time resolution. For this study, we measured the major ion fluxes in a 90-m ice core drilled from the SE-Dome region in 2015, and present the records of annual ion fluxes from 1957 to 2014. From 1970 to 2010, the trend of non-sea-salt (nss) SO42- flux decreases, whereas that for NH4+ increases, tracking well with the anthropogenic SOx and NH3 emissions mainly from North America. The result suggests that these fluxes reflect histories of the anthropogenic SOx and NH3 emissions. In contrast, the decadal trend of NO3- flux differs from the decreasing trend of anthropogenic NOx emissions. Although the cause of this discrepancy remains unclear, it may be related to changes in particle formation processes and chemical scavenging rates caused by an increase in sea-salt and dust and/or a decrease in nssSO42-. We also find a high average NO3- flux (1.13 mmol m-2 yr-1) in the ice core, which suggests a negligible effect from post-depositional NO3- loss. Thus, the SE-Dome region is an excellent location for reconstructing nitrate fluxes. Over a decadal timescale, our NO3- flux record is similar to those from other ice cores in Greenland high-elevation sites, suggesting that NO3- concentrations records from these ice cores are reliable.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Copyright 2018 American Geophysical Union.
PISSN	2169-897X
EISSN	2169-8996
関連情報 (references)	HDL https://hdl.handle.net/2115/67885
関連情報 (references)	HDL https://hdl.handle.net/2115/70252
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1002/2017JD026733