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

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Title: Discovery of argon in air-hydrate crystals in a deep ice core using scanning electron microscopy and energy-dispersive X-ray spectroscopy
Authors: Uchida, Tsutomu Browse this author →KAKEN DB
Shigeyama, Wataru Browse this author
Oyabu, Ikumi Browse this author
Goto-Azuma, Kumiko Browse this author
Nakazawa, Fumio Browse this author
Homma, Tomoyuki Browse this author
Kawamura, Kenji Browse this author
Dahl-Jensen, Dorthe Browse this author
Keywords: Air hydrate
argon
energy-dispersive X-ray spectroscopy
NEEM ice core
scanning electron microscopy
Issue Date: Jun-2022
Publisher: Cambridge University Press
Journal Title: Journal of glaciology
Volume: 68
Issue: 269
Start Page: 547
End Page: 556
Publisher DOI: 10.1017/jog.2021.115
Abstract: 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.
Type: article
URI: http://hdl.handle.net/2115/85147
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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