Interpretation of Subsurface Salinity EOFs on Southern ECS Shelf Using SODA Reanalysis: Large-Scale Patterns and Seasonal to Interannual Variations

doi:10.1029/2020JC017038

IOCAS-IR > 海洋环流与波动重点实验室

	Interpretation of Subsurface Salinity EOFs on Southern ECS Shelf Using SODA Reanalysis: Large-Scale Patterns and Seasonal to Interannual Variations
	Qi, Peng1,2,3 ; Guo, Yun-xia 1
	2022-02-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	127 期号:2 页码:21
通讯作者	Qi, Peng([email protected])
摘要	In the southern East China Sea (ECS), low-salinity shelf water is distinguished from high-salinity Kuroshio water. Neutral density solution of subsurface salinity in southern ECS with Empirical Orthogonal Function (EOF) analysis of Simple Ocean Data Assimilation (SODA) reanalysis data (1958-2008) is presented. This study focuses on seasonal to interannual variations of large-scale patterns. We choose isopycnal 24.5 gamma n ${\gamma }<^>{n}$ as the representative of subsurface layers, which is the deepest of the Kuroshio subsurface that can outcrop to sea surface during winter and early spring. We conducted EOF both including and excluding the seasonal signal. The results show that annual cycles dominate the first two leading EOF modes, EOF-1 representing inner-shelf oscillation, and EOF-2 outer-shelf oscillation. However, EOF-2 also shows significant interannual variability. To this end, we removed the seasonal signal from the dataset and recalculated EOF. We found that the interannual EOF-1 is of cross-shelf in spatial pattern and shows significant interannual variability. This suggests that seaward penetration of the shelf water and shelfward intrusion of the Kuroshio that mainly occur in winter and early spring are a pair of contradictions in the two-way intrusions, which are modulated by significant interannual variability. We also found that the isopycnal extending abnormally northward and outcropping in early spring corresponds to significant non-intrusions of the Kuroshio. In the underlying dynamics, oceanic stratification, besides topography uplifting, plays an important role in the subsurface intrusion of Kuroshio off northeast Taiwan.
关键词	inner-shelf oscillation outer-shelf oscillation interannual variability isopycnal surface neutral density subsurface layer
DOI	10.1029/2020JC017038
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11020101]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000765614000033
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：2[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/337002/178219
专题	海洋环流与波动重点实验室
通讯作者	Qi, Peng
作者单位	1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Ocean & Climate Dynam, Qingdao, Peoples R China
第一作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Qi, Peng,Guo, Yun-xia. Interpretation of Subsurface Salinity EOFs on Southern ECS Shelf Using SODA Reanalysis: Large-Scale Patterns and Seasonal to Interannual Variations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2022,127(2):21.
APA	Qi, Peng,&Guo, Yun-xia.(2022).Interpretation of Subsurface Salinity EOFs on Southern ECS Shelf Using SODA Reanalysis: Large-Scale Patterns and Seasonal to Interannual Variations.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,127(2),21.
MLA	Qi, Peng,et al."Interpretation of Subsurface Salinity EOFs on Southern ECS Shelf Using SODA Reanalysis: Large-Scale Patterns and Seasonal to Interannual Variations".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 127.2(2022):21.

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