Discovery of argon in air-hydrate crystals in a deep ice core using scanning electron microscopy and energy-dispersive X-ray spectroscopy

Uchida, Tsutomu; Shigeyama, Wataru; Oyabu, Ikumi; Goto-Azuma, Kumiko; Nakazawa, Fumio; Homma, Tomoyuki; Kawamura, Kenji; Dahl-Jensen, Dorthe

Discovery of argon in air-hydrate crystals in a deep ice core using scanning electron microscopy and energy-dispersive X-ray spectroscopy

Uchida, Tsutomu; Shigeyama, Wataru; Oyabu, Ikumi et al.

Journal of glaciology, 2022, 68(269), 547-556

Permalink : https://hdl.handle.net/2115/85147

このアイテムのアクセス数:429件（2026-01-19 05:45 集計）

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アクセス権	metadata only access
URI	https://hdl.handle.net/2115/85147
タイトル	Discovery of argon in air-hydrate crystals in a deep ice core using scanning electron microscopy and energy-dispersive X-ray spectroscopy
著者	Uchida, Tsutomu ; Shigeyama, Wataru ; Oyabu, Ikumi ; Goto-Azuma, Kumiko ; Nakazawa, Fumio ; Homma, Tomoyuki ; Kawamura, Kenji ; Dahl-Jensen, Dorthe
e-Rad_Researcher 70356575 著者名 Uchida, Tsutomu
著者名 Shigeyama, Wataru
著者名 Oyabu, Ikumi
著者名 Goto-Azuma, Kumiko
著者名 Nakazawa, Fumio
著者名 Homma, Tomoyuki
著者名 Kawamura, Kenji
著者名 Dahl-Jensen, Dorthe
言語	英語
キーワード	Air hydrate
	argon
	energy-dispersive X-ray spectroscopy
	NEEM ice core
	scanning electron microscopy
発行日	2022-06
出版者	Cambridge University Press
収録物名	Journal of glaciology
巻(号)	68(269)
ページ	547-556
抄録	Tiny samples of ancient atmosphere in air bubbles within ice cores contain argon (Ar), which can be used to reconstruct past temperature changes. At a sufficient depth, the air bubbles are compressed by the overburden pressure under low temperature and transform into air-hydrate crystals. While the oxygen (O-2) and nitrogen (N-2) molecules have indeed been identified in the air-hydrate crystals with Raman spectroscopy, direct observational knowledge of the distribution of Ar at depth within ice sheet and its enclathration has been lacking. In this study, we applied scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) to five air-hydrate crystals in the Greenland NEEM ice core, finding them to contain Ar and N. Given that Ar cannot be detected by Raman spectroscopy, the method commonly used for O-2 and N-2, the SEM-EDS measurement method may become increasingly useful for measuring inert gases in deep ice cores.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
PISSN	0022-1430
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1017/jog.2021.115