Asynchrony between Antarctic temperature and CO2 associated with obliquity over the past 720,000 years

Ryu Uemura (), Hideaki Motoyama, Valérie Masson-Delmotte, Jean Jouzel, Kenji Kawamura, Kumiko Goto-Azuma, Shuji Fujita, Takayuki Kuramoto, Motohiro Hirabayashi, Takayuki Miyake, Hiroshi Ohno, Koji Fujita, Ayako Abe-Ouchi, Yoshinori Iizuka, Shinichiro Horikawa, Makoto Igarashi, Keisuke Suzuki, Toshitaka Suzuki and Yoshiyuki Fujii
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Ryu Uemura: University of the Ryukyus
Hideaki Motoyama: Research Organization of Information and Systems
Valérie Masson-Delmotte: Université Paris Saclay
Jean Jouzel: Université Paris Saclay
Kenji Kawamura: Research Organization of Information and Systems
Kumiko Goto-Azuma: Research Organization of Information and Systems
Shuji Fujita: Research Organization of Information and Systems
Takayuki Kuramoto: Research Organization of Information and Systems
Motohiro Hirabayashi: Research Organization of Information and Systems
Takayuki Miyake: Research Organization of Information and Systems
Hiroshi Ohno: Research Organization of Information and Systems
Koji Fujita: Nagoya University
Ayako Abe-Ouchi: The University of Tokyo
Yoshinori Iizuka: Hokkaido University
Shinichiro Horikawa: Hokkaido University
Makoto Igarashi: Nishina Center, RIKEN
Keisuke Suzuki: Shinshu University
Toshitaka Suzuki: Yamagata University
Yoshiyuki Fujii: Research Organization of Information and Systems

Nature Communications, 2018, vol. 9, issue 1, 1-11

Abstract: Abstract The δD temperature proxy in Antarctic ice cores varies in parallel with CO2 through glacial cycles. However, these variables display a puzzling asynchrony. Well-dated records of Southern Ocean temperature will provide crucial information because the Southern Ocean is likely key in regulating CO2 variations. Here, we perform multiple isotopic analyses on an Antarctic ice core and estimate temperature variations at this site and in the oceanic moisture source over the past 720,000 years, which extend the longest records by 300,000 years. Antarctic temperature is affected by large variations in local insolation that are induced by obliquity. At the obliquity periodicity, the Antarctic and ocean temperatures lag annual mean insolation. Further, the magnitude of the phase lag is minimal during low eccentricity periods, suggesting that secular changes in the global carbon cycle and the ocean circulation modulate the phase relationship among temperatures, CO2 and insolation in the obliquity frequency band.

Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03328-3

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DOI: 10.1038/s41467-018-03328-3

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