Observation of Abyssal Circulation to the West of the Luzon Strait, South China Sea

doi:10.1175/JPO-D-21-0284.1

IOCAS-IR > 海洋环流与波动重点实验室

	Observation of Abyssal Circulation to the West of the Luzon Strait, South China Sea
	Zheng, Hua 1,2; Zhu, Xiao-Hua 1,2,3; Zhang, Chuanzheng 2; Zhao, Ruixiang 2; Zhu, Ze-Nan 2; Ren, Qiang4,5 ; Liu, Yansong 4,5,6; Nan, Feng 4,5,6; Yu, Fei 4,5,6,7
	2022-09-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	52 期号:9 页码:2091-2109
通讯作者	Zhu, Xiao-Hua([email protected])
摘要	South China Sea (SCS) abyssal circulation largely contributes to water renewal, energy budget, and sedimentary processes in the deep ocean. The three-dimensional abyssal circulation west of the Luzon Strait (LS) in the northern SCS was investigated using an array comprising 27 current- and pressure- recording inverted echo sounders. Over 400 days of measurements from June 2018 to July 2019 showed a narrow and strong (similar to 70 km, similar to 2.3 cm s(-1) at 2500 dbar) northward current near the steep eastern boundary, while a wide and weak (similar to 180 km, similar to 1.5 cm s(-1) at 2500 dbar) southwestward current lies along the subdued western boundary. The circulation showed conspicuous cyclonic patterns with a volume transport of similar to 1.21 +/- 0.93 Sv (1 Sv = 10(6) m(3) s(-1)) and similar to 1.59 +/- 0.95 Sv below 2500 dbar along the eastern and western boundaries, respectively. The current near the LS was strong in late autumn and early winter but weak in late winter and spring, following the seasonal variation of LS deep-water overflow. However, the southwestward current in the interior SCS was stronger in summer and early autumn but weaker in late winter and early spring. The different seasonal patterns identified near the LS and the interior SCS are attributed to the propagation of seasonal variation. The weak current along the western boundary in August 2018 and February 2019 was dominated by LS deep-water overflow with a time lag of similar to 7.5 months. Although eddies in the upper ocean may also contribute to such variation through pressure work, the effect is minor. SIGNIFICANCE STATEMENT: Cyclonic circulation in the deep South China Sea (SCS) largely contributes to water renewal, energy budget, and sedimentary processes and influences the transport of dissolved elements, minerals, and pollutants. As an important part of the SCS throughflow, an in-depth analysis of the SCS abyssal circulation may also contribute to understanding Indonesian Throughflow and global climate change. The three-dimensional abyssal circulation west of the Luzon Strait was investigated using large-scale data from June 2018 to July 2019, which provided unprecedented coverage of abyssal circulation in the northeast SCS. The study provides important observational evidence for the existence of SCS abyssal cyclonic circulation. Detailed spatiotemporal structure of abyssal circulation and its variations are presented, and related dynamic processes are discussed.
关键词	Abyssal circulation In situ oceanic observations Seasonal variability
DOI	10.1175/JPO-D-21-0284.1
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41920104006]; National Natural Science Foundation of China[41906024]; Scientific Research Fund of Second Institute of Oceanography, MNR[JZ2001]; Scientific Research Fund of Second Institute of Oceanography, MNR[QNYC2102]; Project of State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography[SOEDZZ2106]; Project of State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography[SOEDZZ2207]; Oceanic Interdisciplinary Program of Shanghai Jiao Tong University[SL2021MS021]; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)[311020004]; Global Climate Changes and Air-Sea Interaction Program[GASI-02-PAC-ST-Wwin]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000895750400008
出版者	AMER METEOROLOGICAL SOC
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/181023
专题	海洋环流与波动重点实验室
通讯作者	Zhu, Xiao-Hua
作者单位	1.Shanghai Jiao Tong Univ, Sch Oceanog, Shanghai, Peoples R China 2.Minist Nat Resources, State Key Lab Satellite Ocean Environm Dynam, Inst Oceanog 2, Hangzhou, Peoples R China 3.Guangdong Lab Zhuhai, Southern Marine Sci & Engn, Zhuhai, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 5.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 6.Pilot Natl Lab Marine Sci & Technol Qingdao, Marine Dynam Proc & Climate Funct Lab, Qingdao, Peoples R China 7.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Hua,Zhu, Xiao-Hua,Zhang, Chuanzheng,et al. Observation of Abyssal Circulation to the West of the Luzon Strait, South China Sea[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2022,52(9):2091-2109.
APA	Zheng, Hua.,Zhu, Xiao-Hua.,Zhang, Chuanzheng.,Zhao, Ruixiang.,Zhu, Ze-Nan.,...&Yu, Fei.(2022).Observation of Abyssal Circulation to the West of the Luzon Strait, South China Sea.JOURNAL OF PHYSICAL OCEANOGRAPHY,52(9),2091-2109.
MLA	Zheng, Hua,et al."Observation of Abyssal Circulation to the West of the Luzon Strait, South China Sea".JOURNAL OF PHYSICAL OCEANOGRAPHY 52.9(2022):2091-2109.