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Large Variability of Dissolved Inorganic Radiocarbon in the Kuroshio Extension of the Northwest North Pacific

Published online by Cambridge University Press:  08 January 2018

Ling Ding
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
Tiantian Ge
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
Huiwang Gao
Affiliation:
Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China
Chunle Luo
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
Yuejun Xue
Affiliation:
Ocean Science Isotope and Geochronology Center, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
Ellen R M Druffel
Affiliation:
Department of Earth System Science, University of California, Irvine, CA 92697-3100, USA
Xuchen Wang*
Affiliation:
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China Ocean Science Isotope and Geochronology Center, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
*
*Corresponding author. Email: xuchenwang@ouc.edu.cn.

Abstract

Radiocarbon (14C) in dissolved inorganic carbon (DIC) was measured for water samples collected from six deep stations in the Kuroshio Extension (KE) region in the northwestern North Pacific in April–May 2015. Vertical profiles of Δ14C-DIC indicate that bomb-produced 14C was present from the surface to ~1500 m water depth. Large variations in Δ14C-DIC values (300‰) were observed at 500 m water depth among the stations and the differences were likely controlled by transport and mixing dynamics of different water masses in the region. The major Pacific western boundary currents, such as Kuroshio and Oyashio and regional mesoscale eddies, could play important roles affecting the observed Δ14C-DIC variability. The depth profiles of both Δ14C-DIC and DIC concentrations can be predicted by the solution mixing model and can be used as conservative tracers of water mass movement and water parcel homogenization in the ocean.

Type
Research Article
Copyright
© 2018 by the Arizona Board of Regents on behalf of the University of Arizona 

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