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| Uemura, Ryu; Motoyama, Hideaki; Masson-delmotte, Valerie; Jouzel, Jean; Kawamura, Kenji; Goto-azuma, Kumiko; Fujita, Shuji; Kuramoto, Takayuki; Hirabayashi, Motohiro; Miyake, Takayuki; Ohno, Hiroshi; Fujita, Koji; Abe-ouchi, Ayako; Iizuka, Yoshinori; Horikawa, Shinichiro; Igarashi, Makoto; Suzuki, Keisuke; Suzuki, Toshitaka; Fujii, Yoshiyuki. |
| The delta D 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... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00496/60788/64966.pdf |
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