A bipolar comparison of deep ice cores from Antarctica (Dome Fuji) and Greenland (GRIP) 

National Institute of Polar Research, special issue 57, p. 86-93, 2003 

H. Shoji, A. Miyamoto and K. Shimohara
Kitami Institute of Technology, 165 Koen-cho, Kitami 090-8507, Japan.
O. Watanabe, Y. Fujii, K. Kamiyama, H. Motoyama, K. Goto-Azuma, M. Igarashi, M. Takata, M. Kohno and S. Fujita
National Institute of Polar Research, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan.
T. Nakazawa, S. Aoki and K. Kawamura
Center for Atmospheric and Oceanic Studies, Tohoku University, Aramaki-aza-aoba, Aoba-ku, Sendai 980-8578, Japan.
H. Narita
Institute of Low Temperature Science, Hokkaido University, Kita-19, Nishi-8, Kita-ku, Sapporo 060-0819, Japan.
K. Kawada
Toyama University, 3190 Gofuku, Toyama 930-8555, Japan
N. Azuma
Nagaoka University of Technology, 1603-1 Kamitomioka-cho, Nagaoka 940-2188, Japan
T. Saito
Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji 611-0011, Japan.
H.B. Clausen and S.J. Johnsen
Geofysisk Afdeling, Niels Bohr Instituttet for Astronomi, Fysik og Geofysik, Københavns Universitet

ABSTRACT.
Oxygen isotope ratio and chemistry profiles were compared to find the corresponding interstadials during the Wisconsin Ice Age between the GRIP (Greenland) and Dome Fuji (Antarctica) deep ice core data for the past one hundred and sixty thousand years. Eight interstadials in GRIP δ¹⁸O profile were found to correspond to those in Dome Fuji δ¹⁸O profile. Eleven interstadials in GRIP δ¹⁸O profile were found to correspond to those in Dome Fuji chemistry (calcium, nitrate and sulfate) profile, which is better suited for the purpose of interstadial search than the δ¹⁸O profile at Dome Fuji. The Eemian interglacial period at Dome Fuji seems to be much shorter and more stable than that in the GRIP profile. Three major periods having higher contents of calcium, nitrate and sulfate appear at Dome Fuji, ranging (1) between interstadials number 1 and 8, (2) between interstadials number 17 and 19, and (3) before the Eemian, which correspond to relatively cold and stable periods in the GRIP δ¹⁸O profile. These findings promise a favorable outcome from more detailed bipolar comparison in the future for an understanding of climatic linkage conditions and the driving forces between northern and southern hemispheres.