气候变化领域集成服务门户(CCPortal): Hypoxic Effects on the Radiocarbon in DIC of the ECS Subsurface Water

CCPortal

DOI	10.1029/2020JC016979
	Hypoxic Effects on the Radiocarbon in DIC of the ECS Subsurface Water
	Wang S.-L.; Fan D.; Huang W.-J.; Wu Y.; Su J.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	Dissolved inorganic carbon (DIC) in the East China Sea (ECS) is physically and chemically affected by the northward intrusion of the Kuroshio Branch Current (KBC) and the Changjiang River (CR) outflow. We trace these processes using dual DIC isotopic compositions (Δ14C and δ13C) along transects that begin in the CR and estuary, and extend out into middle shelf waters of the ECS. We especially focus on frequently occurred nearshore hypoxia, as they appeared in the summer of 2017. The Δ14C values (28.8‰–35.3‰) from the ECS mid-shelf water were comparable to the reported value from the Kuroshio Current (KC) at the continental slope (34.4‰ ± 7.4‰), but Δ14C values in the CR (−173.6‰ & −162.3‰) were substantially lower than observations made in 2014. We also found that the Δ14C of DIC in the bottom waters along the inner shelf, including hypoxic area, decreased from 25.0‰ to 18.5‰, from south to north. Water masses mixing between the CR and the ECS mid-shelf waters with and without organic carbon degradation can be identified in plots of Δ14C versus DIC-1. With simple mixing calculations, we show that the northward decreasing Δ14C of inner shelf bottom water is caused by downward transport of DIC with low Δ14C value mediated by biological process from the surface, as opposed to simple physical mixing. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Dissolved inorganic carbon; East China Sea; hypoxia; Kuroshio Current subsurface water; radiocarbon
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186397
作者单位	Department of Geosciences, National Taiwan University, Taipei, Taiwan; State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; Department of Oceanography, National Sun Yat-sen University, Kaohsiung, Taiwan
推荐引用方式 GB/T 7714	Wang S.-L.,Fan D.,Huang W.-J.,et al. Hypoxic Effects on the Radiocarbon in DIC of the ECS Subsurface Water[J],2021,126(4).
APA	Wang S.-L.,Fan D.,Huang W.-J.,Wu Y.,&Su J..(2021).Hypoxic Effects on the Radiocarbon in DIC of the ECS Subsurface Water.Journal of Geophysical Research: Oceans,126(4).
MLA	Wang S.-L.,et al."Hypoxic Effects on the Radiocarbon in DIC of the ECS Subsurface Water".Journal of Geophysical Research: Oceans 126.4(2021).