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-xia1
2022-02-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN2169-9275
Volume127Issue:2Pages:21
Corresponding AuthorQi, Peng(pqi@qdio.ac.cn)
AbstractIn 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.
Keywordinner-shelf oscillation outer-shelf oscillation interannual variability isopycnal surface neutral density subsurface layer
DOI10.1029/2020JC017038
Indexed BySCI
Language英语
Funding ProjectStrategic Priority Research Program of the Chinese Academy of Sciences[XDA11020101]
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000765614000033
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/178219
Collection海洋环流与波动重点实验室
Corresponding AuthorQi, Peng
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
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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