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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
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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