State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling
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 cha...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/64628 2023-05-15T13:40:56+02:00 State dependence of climatic instability over the past 720,000 years from Antarctic ice cores 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 http://hdl.handle.net/2115/64628 https://doi.org/10.1126/sciadv.1600446 eng eng The American Association for the Advancement of Science(AAAS) http://hdl.handle.net/2115/64628 Science Advances, 3: e1600446 http://dx.doi.org/10.1126/sciadv.1600446 https://creativecommons.org/licenses/by-nc/4.0/ CC-BY-NC article fthokunivhus https://doi.org/10.1126/sciadv.1600446 2022-11-18T01:04:10Z 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core North Atlantic Sea ice Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Antarctic Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) East Antarctica The Antarctic Science Advances 3 2 e1600446 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
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 |
spellingShingle |
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 State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling |
author_facet |
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 |
author_sort |
Kawamura, Kenji |
title |
State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling |
title_short |
State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling |
title_full |
State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling |
title_fullStr |
State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling |
title_full_unstemmed |
State dependence of climatic instability over the past 720,000 years from Antarctic ice cores and climate modeling |
title_sort |
state dependence of climatic instability over the past 720,000 years from antarctic ice cores and climate modeling |
publisher |
The American Association for the Advancement of Science(AAAS) |
url |
http://hdl.handle.net/2115/64628 https://doi.org/10.1126/sciadv.1600446 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Antarctic Dome Fuji East Antarctica The Antarctic |
geographic_facet |
Antarctic Dome Fuji East Antarctica The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core North Atlantic Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core North Atlantic Sea ice |
op_relation |
http://hdl.handle.net/2115/64628 Science Advances, 3: e1600446 http://dx.doi.org/10.1126/sciadv.1600446 |
op_rights |
https://creativecommons.org/licenses/by-nc/4.0/ |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1126/sciadv.1600446 |
container_title |
Science Advances |
container_volume |
3 |
container_issue |
2 |
container_start_page |
e1600446 |
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1766143503529672704 |