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

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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
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
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.
Type: article
URI: http://hdl.handle.net/2115/64628
Appears in Collections:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Greve Ralf

 

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