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タイトル: | State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling |
著者: | 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 |
著者名の別形: | 齊藤, 隆志 |
キーワード: | paleoclimate climate model ice core abrupt climate change Antarctica ice sheet Atlantic Meridional Overturning Circulation |
発行日: | 8-Feb-2017 |
出版者: | American Association for the Advancement of Science (AAAS) |
誌名: | Science Advances |
巻: | 3 |
号: | 2 |
論文番号: | e1600446 |
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 instability with 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. |
記述: | 過去72万年間の気候の不安定性を南極ドームふじアイスコアの解析と気候シミュレーションにより解明. 京都大学プレスリリース. 2017-02-10. |
著作権等: | 2017 © The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). |
URI: | http://hdl.handle.net/2433/218067 |
DOI(出版社版): | 10.1126/sciadv.1600446 |
PubMed ID: | 28246631 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2017-02-10 |
出現コレクション: | 学術雑誌掲載論文等 |
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