气候变化领域集成服务门户(CCPortal): Structure and Variability of Abyssal Current in Northern South China Sea Based on CPIES Observations

CCPortal

DOI	10.1029/2020JC016780
	Structure and Variability of Abyssal Current in Northern South China Sea Based on CPIES Observations
	Zheng H.; Zhang C.; Zhao R.; Zhu X.-H.; Zhu Z.-N.; Liu Z.-J.; Wang M.
发表日期	2021
ISSN	21699275
卷号	126 期号:4
英文摘要	The abyssal current is important for water renewal and energy conversion in the deep South China Sea (SCS), and it potentially contributes to the upper and middle circulations. A mooring array including 11 current and pressure-recording inverted echo sounders was deployed in the northern SCS between July 2016 and April 2019 to observe large-scale and long-term abyssal currents. The yearly averaged current flows southwestward following the boundary with a maximum velocity of 2.25–2.52 cm/s. The spatial structure exhibits a weaker and wider current in the north, where topography is subdued, whereas the current enhances and narrows on the steep slopes. The southwestward current is strong in the summer and autumn but is insignificant in the winter and spring. In the autumn, the current is narrower and closer to the boundary than that in the summer, and a northeastward countercurrent is found ∼60 km away from the western boundary. The southwestward and northeastward currents constitute the cyclonic circulation. Drastic temporal variability is observed in the deep ocean. The abyssal current is dominated by semidiurnal tides, diurnal tides, and near-inertial waves (NIWs) in the high-frequency band. Bursts of NIWs are observed in the deep ocean after two typhoons, and the NIWs propagate southwestward at a velocity of 2.4 m/s. The low-frequency band is dominated by a westward-propagating 70-day fluctuation following the characteristics of topographic Rossby waves. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	abyssal current; current and pressure-recording inverted echo sounder; South China Sea; temporal and spatial variability
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/186407
作者单位	School of Oceanography, Shanghai Jiao Tong University, Shanghai, China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
推荐引用方式 GB/T 7714	Zheng H.,Zhang C.,Zhao R.,et al. Structure and Variability of Abyssal Current in Northern South China Sea Based on CPIES Observations[J],2021,126(4).
APA	Zheng H..,Zhang C..,Zhao R..,Zhu X.-H..,Zhu Z.-N..,...&Wang M..(2021).Structure and Variability of Abyssal Current in Northern South China Sea Based on CPIES Observations.Journal of Geophysical Research: Oceans,126(4).
MLA	Zheng H.,et al."Structure and Variability of Abyssal Current in Northern South China Sea Based on CPIES Observations".Journal of Geophysical Research: Oceans 126.4(2021).