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NORTHEAST PACIFIC SEAWATER RADIOCARBON RECORDED IN ABALONE SHELLS OBTAINED FROM OTSUCHI BAY, JAPAN

Published online by Cambridge University Press:  15 August 2019

Kosuke Ota*
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, Japan Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Japan
Yusuke Yokoyama*
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, Japan Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Japan
Yosuke Miyairi
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, Japan
Jun Hayakawa
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, Japan
Naomi Satoh
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, Japan
Hideki Fukuda
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, Japan
Kiyoshi Tanaka
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, Japan
*
*Corresponding author. Email: k.ota@aori.u-tokyo.ac.jp.
*Corresponding author. Email: k.ota@aori.u-tokyo.ac.jp.

Abstract

Reconstructing past ocean currents in the coastal regions is necessary to better understand the relationship between oceanographic changes and coastal ecosystems. It is known that variations have occurred with large-scale climate changes such as ENSO (El Niño Southern Oscillations) and PDO (Pacific Decadal Oscillations). Thus, reconstruction of past seawater conditions in coastal regions is needed to better understand the relationship between oceanographic changes and coastal ecosystems. Seawater radiocarbon is a unique proxy to understand the properties of water masses. Reef-building corals have been employed extensively and successfully in conducting this type of research into past ocean circulation histories. However, their distribution is limited to the low latitudes and hence alternative archives are required for studies in mid to high-latitude locations. Here, we use abalone shell samples obtained from Otsuchi Bay located in the Tohoku region on the Pacific coast of Northern Japan. Radiocarbon in abalone shells was compared with dissolved inorganic carbon in two-year-long records of river water as well as seawater. The data indicate that abalone shells can be used to reconstruct past seawater radiocarbon variations in northern Japan where coral skeletons are not available for ocean mixing studies.

Type
Conference Paper
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona

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Footnotes

Selected Papers from the 23rd International Radiocarbon Conference, Trondheim, Norway, 17–22 June, 2018

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