Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River

doi:10.1007/s00343-020-0008-7

IOCAS-IR > 海洋环流与波动重点实验室

	Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River
	Wang, Jianfeng 1,2,3; Yu, Fei 1,2,3,4; Ren, Qiang 1,2; Wei, Chuanjie 2
	2020-06-07
发表期刊	JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	2096-5508
页码	15
通讯作者	Yu, Fei(yuf@qdio.ac.cn)
摘要	Based on field hydrological, microstructural, and shipboard Acoustic Doppler Current Profiler data, we quantified the spatial and temporal variability of turbulent mixing in the near-field Changjiang (Yangtze) River plume. The surface dissipation rate (epsilon) changed by three orders of magnitude from near-field (10(-4) W/kg) to far-field (10(-7) W/kg) plumes, indicating a decrease with distance from the river mouth. Below the river plume, epsilon changed with depth to 10(-8) W/kg, and increased to 10(-6) W/kg at the layer where the Taiwan Warm Current (TWC) intruded. Thus, epsilon in the near-field plume showed three layers: surface layer in the river plume, middle layer, and lower TWC layer. In the river plume, the strongest epsilon and turbulent diffusivity (Kz) were greater than 10(-4) W/kg and 10(-2) m(2)/s, respectively, during strong ebb tides. A three-orders-of-magnitude change in epsilon and Kz was observed in the tidal cycle. The depth of the halocline changed with tidal cycles, and stratification (N-2) varied by one order of magnitude. Stratification in the TWC layer followed the distribution of the halocline, which is opposite to the dissipation structure. Tidal currents led to intrusion and turbulent mixing in the TWC layer. During ebb tides, epsilon and Kz were as strong as those measured in the river plume, but did not last as long. The structure of the velocity shear was similar to the dissipation rate in both the river plume and TWC layer, whereas the velocity shear in the TWC layer did not match the stratification structure. In the high dissipation rate area, the gradient Richardson number was smaller than the critical value (Ri(g)<1/4). The Ri(g) structure was consistent with shear and dissipation distributions, indicating that turbulent mixing in the near-field plume was controlled by a combination of shear induced by the discharged river flow and tidal current.
关键词	Changjiang River near-field plume turbulent mixing observation microstructure
DOI	10.1007/s00343-020-0008-7
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NSFC)[41706012] ; National Key Research and Development Program of China[2017YFC1403401] ; National Natural Science Foundation of China (NSFC) Innovative Group Grant[41421005] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406401] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA11020301]
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:000538711200007
出版者	SCIENCE PRESS
引用统计	被引频次：3[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/337002/167739
专题	海洋环流与波动重点实验室
通讯作者	Yu, Fei
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao 266237, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Wang, Jianfeng,Yu, Fei,Ren, Qiang,et al. Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River[J]. JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2020:15.
APA	Wang, Jianfeng,Yu, Fei,Ren, Qiang,&Wei, Chuanjie.(2020).Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River.JOURNAL OF OCEANOLOGY AND LIMNOLOGY,15.
MLA	Wang, Jianfeng,et al."Spatial and temporal variability of turbulent mixing in the near-field of the Changjiang River".JOURNAL OF OCEANOLOGY AND LIMNOLOGY (2020):15.

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