Dating of the Dome Fuji, Antarctica deep ice core (scientific paper)

元データ 国立極地研究所

概要

The Antarctic ice sheet preserves paleo-climate information in the form of physical and chemical stratigraphy. A deep ice core was continuously drilled down to a depth of 2,503 m at Dome Fuji station, East Dronning Maud Land, Antarctica, during the 1993-97 JARE inland operations. Oxygen isotope measurements were conducted on 7 to 50 cm-long ice core samples selected from the entire core depth. A time scale for the Dome Fuji core is calculated from past accumulation rates and an ice flow model. Past accumulation rates were converted from oxygen isotope values by using an empirical equation obtained in the Dome Fuji area. A steady-state flow model was preciously developed for a time scale calculation of the Summit ice core, Greenland. Using reference depth points from volcanic signals and annual layer thickness values measured on the Dome Fuji core allows for tuning of the calculated time scale. A depth-age profile was obtained for the past 320 kyr. The obtained paleo-temperature profile shows the characteristics of the past three glacial and interglacial periods. The power spectrum of δ^<18>O change over an interval of 320 kyr reveals three dominant cycles. The paleo-temperature profile coincides quite well with the Vostok ice core data in general but not in detail, suggesting that further studies are needed both for chronological investigations and a multi-factor, cross-correlation analysis between deep ice cores for climatological understanding.

著者

藤井 理行 国立極地研究所
Watanabe Okitsugu National Institute of Polar Research, Research Organization of Information and Systems
Fujii Yoshiyuki National Institute of Polar Research, Research Organization of Information and Systems
Narita Hideki Institute of Low Temperature Science Pan-Okhotsk Research Center, Hokkaido University
Satow Kazuhide Nagaoka National College of Technology
Shoji Hitoshi Kitami Institute of Technology
Watanabe O National Institute Of Polar Research Research Organization Of Information And Systems
Watanabe Okitsugu National Institute Of Polar Research
Kawaguchi Sadao Nagaoka National College Of Technology
Shimohara Kimiko Kitami Institute of Technology
Aoki Shuji Center for Atmospheric and Oceanic Studies, Tohoku University
Motoyama Hideaki National Institute Of Polar Research
Aoki Shuhji Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University
Narita Hideki Institute Of Low Temperature Science Pan-okhotsk Research Center Hokkaido University
AOKI Shuhji National Institute of Polar Research
Kanamori Satoru Institute For Hydrospheric And Atmospheric Sciences Nagoya University
Aoki S Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Aoki Shuji Center For Atmospheric And Oceanic Studies Graduate School Of Sci. Tohoku Univ.
Aoki Shuhji Faculty Of Science Tohoku University
Aoki Syuji National Institute Of Polar Research
Narita Hideki Institute Of Low Temperature Science Hokkaido University
Satow Kazuhide Nagaoka College Of Technology
Fujii Yoshiyuki National Institute Of Polar Research
Watanabe Okitsusgu National Institute of Polar Research
Kanamori Satoru National Institute of Polar Research
Satow Kazuhide Nagoya Technical College
Fujii Y National Inst. Polar Res. Tokyo
清水 明 Center For Atmospheric And Oceanic Studies Graduate School Of Science Tohoku University
Shinbori K Hokkaido Univ. Sapporo
Koga S National Inst. Resources And Environment Tsukuba
Motoyama Hideaki National Inst. Of Polar Res. 10-3 Midori-cho Tachikawa-shi Tokyo 190-8518 Jpn

関連論文

▼もっと見る