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Dissolved Inorganic Radiocarbon in the Northwest Pacific Continental Margin

Published online by Cambridge University Press:  30 March 2016

Tiantian Ge ,
Xuchen Wang ,
Jing Zhang ,
Chunle Luo  and
Yuejun Xue
Tiantian Ge
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Xuchen Wang*
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China. Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China.
Jing Zhang
Affiliation:
Graduate School of Science and Engineering, Toyama University, Toyama 9308555, Japan.
Chunle Luo
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
Yuejun Xue
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
*
*Corresponding author. Email: xuchenwang@ouc.edu.cn.
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Abstract

This article presents a modified method for extraction of dissolved inorganic carbon (DIC) from seawater for radiocarbon measurement by accelerator mass spectrometry (AMS). Standard tests indicate that the extraction efficiencies of DIC are >96%, and the respective precisions of Δ14C-DIC and δ13C-DIC analyses are 6‰ and 0.1‰ or better. Using the method, we report Δ14C-DIC profiles collected from the shelf and slope in the East China Sea (ECS) of the northwest Pacific Ocean. Both the DIC concentration and Δ14C-DIC in the shelf and slope regions seem primarily affected by the Kuroshio Current. It is estimated that 54–65% of the bottom water in the shelf region could be from the intrusion of Kuroshio intermediate water, which carries a high concentration and low Δ14C values of DIC, and which influenced the DIC and its 14C signature on the shelf. Compared with the Δ14C-DIC profiles at other sites in the northwest Pacific reported previously, it appears that the Δ14C-DIC distributions are mainly controlled by the major oceanic currents in the region, and large variations in Δ14C-DIC occurred mostly in the upper 800 m of the water column. The similarity of Δ14C-DIC at depth suggests that the deep-water circulation patterns have been relatively stable in the northwest Pacific Ocean in the last 20 yr.

Keywords

dissolved inorganic carbonradiocarbonstable carbon isotopeEast China Seacontinental margin
Type
Research Article
Information
Radiocarbon , Volume 58 , Issue 3 , September 2016 , pp. 517 - 529
Copyright
© 2016 by the Arizona Board of Regents on behalf of the University of Arizona 

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