| Title: | State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling |
| Authors: | Kawamura, Kenji Browse this author |
| Abe-Ouchi, Ayako Browse this author |
| Motoyama, Hideaki Browse this author |
| Ageta, Yutaka Browse this author |
| Aoki, Shuji Browse this author |
| Azuma, Nobuhiko Browse this author |
| Fujii, Yoshiyuki Browse this author |
| Fujita, Koji Browse this author |
| Fujita, Shuji Browse this author |
| Fukui, Kotaro Browse this author |
| Furukawa, Teruo Browse this author |
| Furusaki, Atsushi Browse this author |
| Goto-Azuma, Kumiko Browse this author |
| Greve, Ralf Browse this author →KAKEN DB |
| Hirabayashi, Motohiro Browse this author |
| Hondoh, Takeo Browse this author |
| Hori, Akira Browse this author |
| Horikawa, Shinichiro Browse this author |
| Horiuchi, Kazuho Browse this author |
| Igarashi, Makoto Browse this author |
| Iizuka, Yoshinori Browse this author →KAKEN DB |
| Kameda, Takao Browse this author |
| Kanda, Hiroshi Browse this author |
| Kohno, Mika Browse this author |
| Kuramoto, Takayuki Browse this author |
| Matsushi, Yuki Browse this author |
| Miyahara, Morihiro Browse this author |
| Miyake, Takayuki Browse this author |
| Miyamoto, Atsushi Browse this author |
| Nagashima, Yasuo Browse this author |
| Nakayama, Yoshiki Browse this author |
| Nakazawa, Takakiyo Browse this author |
| Nakazawa, Fumio Browse this author |
| Nishio, Fumihiko Browse this author |
| Obinata, Ichio Browse this author |
| Ohgaito, Rumi Browse this author |
| Oka, Akira Browse this author |
| Okuno, Jun'ichi Browse this author |
| Okuyama, Junichi Browse this author |
| Oyabu, Ikumi Browse this author |
| Parrenin, Frédéric Browse this author |
| Pattyn, Frank Browse this author |
| Saito, Fuyuki Browse this author |
| Saito, Takashi Browse this author |
| Saito, Takeshi Browse this author |
| Sakurai, Toshimitsu Browse this author |
| Sasa, Kimikazu Browse this author |
| Seddik, Hakime Browse this author |
| Shibata, Yasuyuki Browse this author |
| Shinbori, Kunio Browse this author |
| Suzuki, Keisuke Browse this author |
| Suzuki, Toshitaka Browse this author |
| Takahashi, Akiyoshi Browse this author |
| Takahashi, Kunio Browse this author |
| Takahashi, Shuhei Browse this author |
| Takata, Morimasa Browse this author |
| Tanaka, Yoichi Browse this author |
| Uemura, Ryu Browse this author |
| Watanabe, Genta Browse this author |
| Watanabe, Okitsugu Browse this author |
| Yamasaki, Tetsuhide Browse this author |
| Yokoyama, Kotaro Browse this author |
| Yoshimori, Masakazu Browse this author |
| Yoshimoto, Takayasu Browse this author |
| Issue Date: | 8-Feb-2017 |
| Publisher: | The American Association for the Advancement of Science（AAAS） |
| Journal Title: | Science Advances |
| Volume: | 3 |
| Start Page: | e1600446 |
| Publisher DOI: | 10.1126/sciadv.1600446 |
| Abstract: | 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. |
| Rights: | https://creativecommons.org/licenses/by-nc/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/64628 |
| Appears in Collections: | 低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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