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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
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  KAKEN_id
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
Author's alias: 齊藤, 隆志
Keywords: paleoclimate
climate model
ice core
abrupt climate change
Antarctica ice sheet
Atlantic Meridional Overturning Circulation
Issue Date: 8-Feb-2017
Publisher: American Association for the Advancement of Science (AAAS)
Journal title: Science Advances
Volume: 3
Issue: 2
Thesis number: e1600446
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 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.
Description: 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.
Rights: 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(Published Version): 10.1126/sciadv.1600446
PubMed ID: 28246631
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2017-02-10
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