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Radiocarbon Marine Reservoir Ages in the Northwestern Pacific Off Hokkaido Island, Japan, During the Last Deglacial Period

Published online by Cambridge University Press:  18 July 2016

Ken'ichi Ohkushi ,
Masao Uchida ,
Kaori Aoki ,
Minoru Yoneda ,
Ken Ikehara ,
Kayo Minoshima ,
Hodaka Kawahata ,
Ryuji Tada ,
Masafumi Murayama  and
Yasuyuki Shibata
Ken'ichi Ohkushi*
Affiliation:
Faculty of Human Development, Kobe University, 3–11 Tsurukabuto, Nada-ku, Kobe 657–8501, Japan
Masao Uchida
Affiliation:
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka 237–0061, Japan
Kaori Aoki
Affiliation:
University of Toronto, Toronto, Ontario M5S 3B1, Canada
Minoru Yoneda
Affiliation:
Graduate School of Frontier Sciences, University of Tokyo, Nakano-ku 164–8639, Japan
Ken Ikehara
Affiliation:
Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 305–8567, Japan
Kayo Minoshima
Affiliation:
Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, 305–8567, Japan
Hodaka Kawahata
Affiliation:
Graduate School of Frontier Sciences, University of Tokyo, Nakano-ku 164–8639, Japan
Ryuji Tada
Affiliation:
Graduate School of Frontier Sciences, University of Tokyo, Nakano-ku 164–8639, Japan
Masafumi Murayama
Affiliation:
Kochi University, Kochi 783–8502, Japan
Yasuyuki Shibata
Affiliation:
National Institute for Environmental Studies, Tsukuba 305–0051, Japan
*
Corresponding author. Email: ohkushi@penguin.kobe-u.ac.jp
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Abstract

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We measured radiocarbon ages of planktic foraminifera in 4 sediment cores from the northwestern Pacific region off northern Japan in order to estimate marine reservoir ages during the B⊘lling-Aller⊘d period. The ages of deglacial tephra markers from 2 Japanese source volcanoes identified in these sediment cores had been previously estimated from 14C ages of terrestrial charcoal and buried forests. By comparing the foraminiferal and tephra ages, we estimated the surface water reservoir age during the B⊘lling-Aller⊘d period to be ∼1000 yr or more in the region off northern Japan. The deglacial reservoir ages were more than 200 yr higher than the Holocene values of ∼800 yr. The older deglacial ages may have been caused by active upwelling of deep water during the last deglaciation and the consequent mixing of “older” deep water with “younger” surface waters.

Type
Articles
Information
Radiocarbon , Volume 49 , Issue 2 , 2007 , pp. 963 - 968
Copyright
Copyright © 2007 by the Arizona Board of Regents on behalf of the University of Arizona 

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