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Freshening of the upper ocean in the South China Sea since the early 1990s
Nan, Feng1; Yu, Fei1; Xue, Huijie2,3; Zeng, Lili2; Wang, Dongxiao2; Yang, Shilun4; Kim-Cuong Nguyen5
2016-12-01
Source PublicationDEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
Volume118Pages:20-29
SubtypeArticle
AbstractOcean salinity is often used as a dynamical tracer for investigating the Kuroshio intrusion into the South China Sea (SCS). In this study, we found that the upper-ocean water in the SCS had a freshening trend since the early 1990s. Salinity in the upper 100 m of the SCS (S-SCS) decreased by similar to 0.24 psu in the period 1993-2012, yielding a negative trend of -0.012 psu yr(-1). The maximum freshening occurred in the surface layer west of the Luzon Strait, and freshening gradually lessened from northeast to southwest and with depth, indicating the important influence of the Kuroshio intrusion. Quantitative analysis of salinity budget from the surface to 100 m depth in the SCS suggests that the weakened Kuroshio intrusion is the leading factor controlling the S-scs freshening, while the increased air-sea freshwater flux plays a minor role. Based on GODAS (Global Ocean Data Assimilation System) model output, the Luzon Strait transport (LST) in the upper 100 m decreased in a negative trend of -0.12 Sv yri(-1) (1 Sv=10(6) m(3) s(-1)) from 1993 to 2012, corresponding to a freshening trend of the Sacs at a rate of -0.011 psu yr(-1). Both the LST and Sacs changes are closely related to the Pacific Decadal Oscillation (PDO). Our findings demonstrate that the strength of the Kuroshio intrusion into the SCS weakened markedly since the PDO phase shifted in 1990s, which resulted in the pronounced freshening of the SCS water.
KeywordSouth China Sea Salinity Water Mass Freshening Kuroshio Intrusion
DOI10.1016/j.dsr.2016.10.010
Indexed BySCI
Language英语
WOS IDWOS:000391777000003
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/136291
Collection海洋环境工程技术研究发展中心
Affiliation1.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China
2.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China
3.Univ Maine, Sch Marine Sci, Orono, ME USA
4.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai, Peoples R China
5.VNU Univ Sci, Dept Marine Sci & Technol, Hanoi, Vietnam
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Nan, Feng,Yu, Fei,Xue, Huijie,et al. Freshening of the upper ocean in the South China Sea since the early 1990s[J]. DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,2016,118:20-29.
APA Nan, Feng.,Yu, Fei.,Xue, Huijie.,Zeng, Lili.,Wang, Dongxiao.,...&Kim-Cuong Nguyen.(2016).Freshening of the upper ocean in the South China Sea since the early 1990s.DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS,118,20-29.
MLA Nan, Feng,et al."Freshening of the upper ocean in the South China Sea since the early 1990s".DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS 118(2016):20-29.
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