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

Author

Listed:
  • Ryu Uemura

    (University of the Ryukyus)

  • Hideaki Motoyama

    (Research Organization of Information and Systems
    The Graduate University for Advanced Studies (SOKENDAI))

  • Valérie Masson-Delmotte

    (Université Paris Saclay)

  • Jean Jouzel

    (Université Paris Saclay)

  • Kenji Kawamura

    (Research Organization of Information and Systems
    The Graduate University for Advanced Studies (SOKENDAI))

  • Kumiko Goto-Azuma

    (Research Organization of Information and Systems
    The Graduate University for Advanced Studies (SOKENDAI))

  • Shuji Fujita

    (Research Organization of Information and Systems
    The Graduate University for Advanced Studies (SOKENDAI))

  • Takayuki Kuramoto

    (Research Organization of Information and Systems
    Fukushima Prefectural Center for Environmental Creation)

  • Motohiro Hirabayashi

    (Research Organization of Information and Systems
    The Graduate University for Advanced Studies (SOKENDAI))

  • Takayuki Miyake

    (Research Organization of Information and Systems)

  • Hiroshi Ohno

    (Research Organization of Information and Systems
    Kitami Institute of Technology)

  • Koji Fujita

    (Nagoya University)

  • Ayako Abe-Ouchi

    (The University of Tokyo
    Japan Agency for Marine-Earth Science and Technology)

  • Yoshinori Iizuka

    (Hokkaido University)

  • Shinichiro Horikawa

    (Hokkaido University
    Nagoya University)

  • Makoto Igarashi

    (Nishina Center, RIKEN)

  • Keisuke Suzuki

    (Shinshu University)

  • Toshitaka Suzuki

    (Yamagata University)

  • Yoshiyuki Fujii

    (Research Organization of Information and Systems)

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.

Suggested Citation

  • Ryu Uemura & Hideaki Motoyama & Valérie Masson-Delmotte & Jean Jouzel & Kenji Kawamura & Kumiko Goto-Azuma & Shuji Fujita & Takayuki Kuramoto & Motohiro Hirabayashi & Takayuki Miyake & Hiroshi Ohno & , 2018. "Asynchrony between Antarctic temperature and CO2 associated with obliquity over the past 720,000 years," Nature Communications, Nature, vol. 9(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-03328-3
    DOI: 10.1038/s41467-018-03328-3
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    Cited by:

    1. Ilaria Crotti & Aurélien Quiquet & Amaelle Landais & Barbara Stenni & David J. Wilson & Mirko Severi & Robert Mulvaney & Frank Wilhelms & Carlo Barbante & Massimo Frezzotti, 2022. "Wilkes subglacial basin ice sheet response to Southern Ocean warming during late Pleistocene interglacials," Nature Communications, Nature, vol. 13(1), pages 1-11, December.

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