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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
发表期刊DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
卷号118页码:20-29
文章类型Article
摘要Ocean 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.
关键词South China Sea Salinity Water Mass Freshening Kuroshio Intrusion
DOI10.1016/j.dsr.2016.10.010
收录类别SCI
语种英语
WOS记录号WOS:000391777000003
引用统计
文献类型期刊论文
版本出版稿
条目标识符http://ir.qdio.ac.cn/handle/337002/136291
专题海洋环境工程技术研究发展中心
作者单位1.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
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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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