State dependence of climatic instability over the past 720,000 years from Antarctic ice-core records and climate modeling

• Kawamura, Kenji

• Abe-Ouchi, Ayako

• Motoyama, Hideaki

• Ageta, Yutaka

• Aoki, Shuji

• Azuma, Nobuhiko

• Fujii, Yoshiyuki

• Fujita, Koji

• Fujita, Shuji

• Fukui, Kotaro

• Furukawa, Teruo

• Furusaki, Atsushi

• Goto-Azuma, Kumiko

• Greve, Ralf

• Hirabayashi, Motohiro

• Hondoh, Takeo

• Hori, Akira

• Horikawa, Shinichiro

• Horiuchi, Kazuho

• Igarashi, Makoto

• Iizuka, Yoshinori

• Kameda, Takao

• Kanda, Hiroshi

• Kohno, Mika

• Kuramoto, Takayuki

• Matsushi, Yuki

• Miyahara, Morihiro

• Miyake, Takayuki

• Miyamoto, Atsushi

• Nagashima, Yasuo

• Nakayama, Yoshiki

• Nakazawa, Takakiyo

• Nakazawa, Fumio

• Nishio, Fumihiko

• Obinata, Ichio

• Ohgaito, Rumi

• Oka, Akira

• Okuno, Jun'ichi

• Okuyama, Junichi

• Oyabu, Ikumi

• Parrenin, Frédéric

• Pattyn, Frank

• Saito, Fuyuki

• Saito, Takashi

• Saito, Takeshi

• Sakurai, Toshimitsu

• Sasa, Kimikazu

• Seddik, Hakime

• Shibata, Yasuyuki

• Shinbori, Kunio

• Suzuki, Keisuke

• Suzuki, Toshitaka

• Takahashi, Akiyoshi

• Takahashi, Kunio

• Takahashi, Shuhei

• Takata, Morimasa

• Tanaka, Yoichi

• Uemura, Ryu

• Watanabe, Genta

• Watanabe, Okitsugu

• Yamasaki, Tetsuhide

• Yokoyama, Kotaro

• Yoshimori, Masakazu

• Yoshimoto, Takayasu

書誌事項

タイトル別名

• State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling

抄録

Climatic variabilities on millennial and longer time scales with a bipolar seesaw pattern have been documented in paleoclimatic records, but their frequencies, relationships with mean climatic state, and mechanisms remain unclear. Understanding the processes and sensitivities that underlie these changes will underpin better understanding of the climate system and projections of its future change. We investigate the long-term characteristics of climatic variability using a new ice-core record from Dome Fuji, East Antarctica, combined with an existing long record from the Dome C ice core. Antarctic warming events over the past 720,000 years are most frequent when the Antarctic temperature is slightly below average on orbital time scales, equivalent to an intermediate climate during glacial periods, whereas interglacial and fully glaciated climates are unfavourable for a millennial-scale bipolar seesaw. Numerical experiments using a fully coupled atmosphere-ocean general circulation model with freshwater hosing in the northern North Atlantic showed that climate becomes most unstable in intermediate glacial conditions associated with large changes in sea ice and the Atlantic Meridional Overturning Circulation. Model sensitivity experiments suggest that the prerequisite for the most frequent climate instabilitywith bipolar seesaw pattern during the late Pleistocene era is associated with reduced atmospheric CO2 concentration via global cooling and sea ice formation in the North Atlantic, in addition to extended Northern Hemisphere ice sheets.

収録刊行物

• Science Advances

  Science Advances 3 e1600446-, 2017-02-08

  The American Association for the Advancement of Science（AAAS）

キーワード

• paleoclimate
• climate model
• ice core
• abrupt climate change
• Antarctica ice sheet
• Atlantic Meridional Overturning Circulation

詳細情報

• CRID: 1050001339022810752
• NII論文ID: 120005981371
• DOI: 10.1126/sciadv.1600446
• ISSN: 23752548
• HANDLE: 2115/64628
• HANDLE: 2241/00145840
• HANDLE: 2433/218067
• Web Site: https://tsukuba.repo.nii.ac.jp/records/40890
• Web Site: https://www.science.org/doi/pdf/10.1126/sciadv.1600446
• 本文言語コード: en
• 資料種別: journal article
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