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Ocean salinity changes in the northwest Pacific subtropical gyre: The quasi-decadal oscillation and the freshening trend
Nan, Feng; Yu, Fei; Xue, Huijie; Wang, Ran; Si, Guangcheng; yuf@qdio.ac.cn
2015
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume120Issue:3Pages:2179-2192
Subtype2169-9275
AbstractOcean salinity changes play an important role in modulating ocean and climate variability. Analyses of the repeating observations along PN, TK, and 137 degrees E sections reveal that both surface and subsurface salinity in the Northwest Pacific Subtropical Gyre (NPSG) had clear quasi-decadal oscillation (QDO) of approximate to 10 year and a sustained freshening trend during 1987-2012. Surface salinity in the NPSG troughed in 1989, 1999, and 2008, and peaked in 1993, and 2003. The peak-to-tough range of surface salinity oscillation can reach 0.3 psu. Meanwhile, surface salinity decreased about 0.10 psu from 1987 to 2012 with a freshening trend of -0.0042 psu yr(-1). These surface salinity anomalies were subducted into the subsurface layer mainly in the ventilated zone along the Kuroshio Extension, and advected over the NPSG. The QDO of the subsurface salinity maximum (S-max) lagged that of the surface salinity by about 1 approximate to 2 years. Both the peak-to-tough range of the S-max oscillation (0.15 psu) and its freshening trend (-0.0036 psu yr(-1)) are smaller than those of the surface salinity. Salinity changes in the NPSG likely began in the mid-1970s associated with the North Pacific regime shift during 1976/1977. Analyses of mixed layer salinity budget indicated that air-sea freshwater flux change in the NPSG is the leading factor controlling the surface salinity anomalies, while change of large-scale ocean circulation (Geostrophic advection) also plays a minor role. Salinity and air-sea freshwater flux changes in the NPSG are all closely related to the Pacific Decadal Oscillation, indicating the large-scale ocean-atmosphere interaction.
Department[Nan, Feng; Yu, Fei; Wang, Ran; Si, Guangcheng] Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Wave Studies, Qingdao, Peoples R China; [Xue, Huijie] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China; [Xue, Huijie] Univ Maine, Sch Marine Sci, Orono, ME USA ; LTO
KeywordPacific Subtropical Gyre Salinity Quasi-decadal Oscillation Freshening
Subject AreaOceanography
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15112
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authoryuf@qdio.ac.cn
Recommended Citation
GB/T 7714
Nan, Feng,Yu, Fei,Xue, Huijie,et al. Ocean salinity changes in the northwest Pacific subtropical gyre: The quasi-decadal oscillation and the freshening trend[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2015,120(3):2179-2192.
APA Nan, Feng,Yu, Fei,Xue, Huijie,Wang, Ran,Si, Guangcheng,&yuf@qdio.ac.cn.(2015).Ocean salinity changes in the northwest Pacific subtropical gyre: The quasi-decadal oscillation and the freshening trend.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,120(3),2179-2192.
MLA Nan, Feng,et al."Ocean salinity changes in the northwest Pacific subtropical gyre: The quasi-decadal oscillation and the freshening trend".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 120.3(2015):2179-2192.
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