Increased interglacial atmospheric CO2 levels followed the mid-Pleistocene Transition

Yamamoto, Masanobu; Clemens, Steven C.; Seki, Osamu; Tsuchiya, Yuko; Huang, Yongsong; O'ishi, Ryouta; Abe-Ouchi, Ayako

Increased interglacial atmospheric CO2 levels followed the mid-Pleistocene Transition

Yamamoto, Masanobu; Clemens, Steven C.; Seki, Osamu et al.

Nature Geoscience, 2022, 15(4), 307-313

Permalink : https://hdl.handle.net/2115/86913

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論文情報

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アクセス権	open access
URI	https://hdl.handle.net/2115/86913
タイトル	Increased interglacial atmospheric CO2 levels followed the mid-Pleistocene Transition
著者	Yamamoto, Masanobu ; Clemens, Steven C. ; Seki, Osamu ; Tsuchiya, Yuko ; Huang, Yongsong ; O'ishi, Ryouta ; Abe-Ouchi, Ayako
e-Rad_Researcher 60332475 著者名 Yamamoto, Masanobu
著者名 Clemens, Steven C.
e-Rad_Researcher 30374648 著者名 Seki, Osamu
著者名 Tsuchiya, Yuko
著者名 Huang, Yongsong
著者名 O'ishi, Ryouta
e-Rad_Researcher 30272537 著者名 Abe-Ouchi, Ayako
言語	英語
発行日	2022-04
出版者	Nature Portfolio
収録物名	Nature Geoscience
巻(号)	15(4)
ページ	307-313
抄録	Atmospheric CO2 and polar ice volume have been strongly coupled over the past 805,000 years. However, the prior extent of coupling, during times of lower-amplitude ice-volume variability, is unknown because continuous high-resolution CO2 records are lacking. We reconstructed the past 1,460,000 years of atmospheric CO2 (similar to 1,700year sample resolution) by taking advantage of the unique relationship between CO2 concentration and leaf-wax delta C-13 resulting from changes in the extent of C-3 and C-4 vegetation in East India. Notably, reconstructed interglacial CO2 concentrations were lower before the transition to large volume variability during the mid-Pleistocene Transition (900,000 years ago). Prior to the mid-Pleistocene Transition, CO2 exhibited a secular trend similar to that of deep-ocean carbon isotopes. At orbital time scales, phase analysis indicates that the CO2 lead relative to ice volume changed to a lag during the mid-Pleistocene Transition. Combined, these findings suggest that deep-ocean circulation controlled the long-term CO2 trend, and that interaction between CO2, continental ice and deep-ocean circulation was reorganized during the mid-Pleistocene Transition, involving a decrease in carbon storage in the deep Pacific.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	1752-0894
EISSN	1752-0908
NCID	AA12309409
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1038/s41561-022-00918-1