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Insight into Western Pacific Circulation from South China Sea Coral Skeletal Radiocarbon

Published online by Cambridge University Press:  27 November 2019

Shoko Hirabayashi Open the ORCID record for Shoko Hirabayashi [Opens in a new window] ,
Yusuke Yokoyama Open the ORCID record for Yusuke Yokoyama [Opens in a new window] ,
Atsushi Suzuki ,
Yosuke Miyairi ,
Takahiro Aze ,
Fernando Siringan  and
Yasuo Maeda
Shoko Hirabayashi*
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan Department of Environmental Changes, Graduate School of Social and Cultural Studies, Kyushu University, Fukuoka 819-0395, Japan
Yusuke Yokoyama*
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Atsushi Suzuki
Affiliation:
Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan
Yosuke Miyairi
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
Takahiro Aze
Affiliation:
Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
Fernando Siringan
Affiliation:
Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines
Yasuo Maeda
Affiliation:
Institute of Natural and Environmental Sciences, University of Hyogo, 6 Yayoigaoka, Sanda, Hyogo, 669-1546, Japan
*
*Corresponding authors. Emails: hirabayashi.shoko.0202@gmail.com; yokoyama@aori.u-tokyo.ac.jp.
*Corresponding authors. Emails: hirabayashi.shoko.0202@gmail.com; yokoyama@aori.u-tokyo.ac.jp.
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Abstract

The trajectory of the Kuroshio, the western boundary current in the north Pacific, influences regional climate. It intrudes into the South China Sea (SCS) through the Luzon Strait, resulting in the exchange of water, nutrients, heat, and salt between the Pacific and SCS. It has been reported that the trajectory of the Kuroshio has varied with decadal climate changes. However, there has been no report of an observation-based estimate of the variation in the Luzon Strait transport. Here, a 50-year, high-resolution coral skeletal radiocarbon (Δ14C) dataset from 1946 to 1994 is reported from Currimao, northwest of Luzon Island. Δ14C has been used as a sensitive tracer of seawater, and our data indicates a significant increase in Δ14C from 1946 to 1994 related to atmospheric nuclear bomb testing, with more rapid increase in the SCS than in the Pacific. The unusual, rapid Δ14C increase in the 1950s found in our SCS corals together with seasonal variation in Δ14C will helps constrain physical oceanographic models for the western Pacific, including the SCS.

Keywords

bomb-14CcoralEast Asian monsoonKuroshio South China Sea
Type
Conference Paper
Information
Radiocarbon , Volume 61 , Issue 6: Radiocarbon 2018 Conference Proceedings Trondheim, Norway, June 17–22, 2018 Part 2 of 2 , December 2019 , pp. 1923 - 1937
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona 

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