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https://hdl.handle.net/20.500.14094/90008235
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2024-04-20
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90008235
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open access
出版タイプ
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タイトル
Rapid coupling between solid earth and ice volume during the Quaternary
著者
Kuwahara, Yusuke ; Yasukawa, Kazutaka ; Fujinaga, Koichiro ; Nozaki, Tatsuo ; Ohta, Junichiro ; Sato, Honami ; Kimura, Jun-Ichi ; Nakamura, Kentaro ; Yokoyama, Yusuke ; Kato, Yasuhiro
著者名
Kuwahara, Yusuke
著者名
Yasukawa, Kazutaka
著者名
Fujinaga, Koichiro
著者名
Nozaki, Tatsuo
著者名
Ohta, Junichiro
著者名
Sato, Honami
著者名
Kimura, Jun-Ichi
著者名
Nakamura, Kentaro
著者名
Yokoyama, Yusuke
著者名
Kato, Yasuhiro
収録物名
Scientific Reports
巻(号)
11
ページ
5695
出版者
Nature Research
刊行日
2021-03-11
公開日
2021-04-30
抄録
The solid earth plays a major role in controlling Earth’s surface climate. Volcanic degassing of carbon dioxide (CO2) and silicate chemical weathering are known to regulate the evolution of climate on a geologic timescale (> 106 yr), but the relationship between the solid earth and the shorter (< 105 yr) fluctuations of Quaternary glacial–interglacial cycles is still under debate. Here we show that the seawater osmium isotope composition (187Os/188Os), a proxy for the solid earth’s response to climate change, has varied during the past 300,000 years in association with glacial–interglacial cycles. Our marine Os isotope mass-balance simulation reveals that the observed 187Os/188Os fluctuation cannot be explained solely by global chemical weathering rate changes corresponding to glacial–interglacial climate changes, but the fluctuation can be reproduced by taking account of short-term inputs of (1) radiogenic Os derived from intense weathering of glacial till during deglacial periods and (2) unradiogenic Os derived from enhanced seafloor hydrothermalism triggered by sea-level falls associated with increases of ice sheet volume. Our results constitute the first evidence that ice sheet recession and expansion during the Quaternary systematically and repetitively caused short-term (< 105 yr) solid earth responses via chemical weathering of glacial till and seafloor magmatism. This finding implies that climatic changes on < 105 yr timescales can provoke rapid feedbacks from the solid earth, a causal relationship that is the reverse of the longer-term (> 106 yr) causality that has been conventionally considered.
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学術雑誌論文
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© The Author(s) 2021.
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
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journal article
言語
English (英語)
eISSN
2045-2322
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DOI
https://doi.org/10.1038/s41598-021-84448-7
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