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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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.
I: Journal of Glaciology, Bind 68, Nr. 269, 2022, s. 547-556.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Discovery of argon in air-hydrate crystals in a deep ice core using scanning electron microscopy and energy-dispersive X-ray spectroscopy
AU - Uchida, Tsutomu
AU - Shigeyama, Wataru
AU - Oyabu, Ikumi
AU - Goto-Azuma, Kumiko
AU - Nakazawa, Fumio
AU - Homma, Tomoyuki
AU - Kawamura, Kenji
AU - Dahl-Jensen, Dorthe
N1 - Publisher Copyright: Copyright © The Author(s), 2021. Published by Cambridge University Press.
PY - 2022
Y1 - 2022
N2 - 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 (O2) and nitrogen (N2) 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 O2 and N2, the SEM-EDS measurement method may become increasingly useful for measuring inert gases in deep ice cores.
AB - 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 (O2) and nitrogen (N2) 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 O2 and N2, the SEM-EDS measurement method may become increasingly useful for measuring inert gases in deep ice cores.
KW - Air hydrate
KW - argon
KW - energy-dispersive X-ray spectroscopy
KW - NEEM ice core
KW - scanning electron microscopy
U2 - 10.1017/jog.2021.115
DO - 10.1017/jog.2021.115
M3 - Journal article
AN - SCOPUS:85120051024
VL - 68
SP - 547
EP - 556
JO - Journal of Glaciology
JF - Journal of Glaciology
SN - 0022-1430
IS - 269
ER -
ID: 343344650