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A North-South Contrast of Subsurface Salinity Anomalies in the Northwestern Pacific From 2002 to 2013
Yan, Youfang; Svendsen, Lea1,2; Wang, Chunzai; Keenlyside, Noel1,2,3; Xu, Dazhi4
AbstractThis paper finds a north-south contrast of subsurface salinity trend during 2002-2013 in the northwestern Pacific. Both Argo float data and long-term repeat hydrographic measurements along the 137 degrees E section show that salinity anomalies along the isopycnals of 24.5-25.4kg/m(3) exhibit a pronounced decreasing trend north of 15 degrees N and an increasing trend south of 15 degrees N. We perform a quantitative analysis based on satellite-derived data and a qualitative analysis that used a lower-order isopyncal salinity model that represents key balance terms (i.e., evaporation E, precipitation P, and wind forcing advection). Both of the analyses consistently show that the subsurface salinity anomalies in the north and south of 15 degrees N are induced by different physical processes. Fresher surface waters in the northwestern subtropical outcrop region due to an excess freshwater supply (E-P<0) contribute to the freshening of subsurface waters north of 15 degrees N. In contrast, saltier surface waters in the northeastern subtropical subduction region induced by a deficit of freshwater (E-P>0) and anomalous ocean circulation associated with the recent accelerated trade winds of the tropical Pacific cause the saltiness of subsurface waters south of 15 degrees N. The results imply that the salinity north-south contrast may play an important role in changing ocean thermocline structure and upper ocean stratification in the northwestern Pacific. Plain Language Summary Salinity, along with temperature and density, is a fundamental variable for seawater and can be considered as a tracer of ocean circulation. Additionally, as an important indicator of freshwater flux, salinity change is an essential measure of the hydrological cycle. The observations show a north-south contrast of salinity trends in the northwestern Pacific. This north-south contrast features will change upper ocean structure such as mixed layer depth and oceanic barrier layers and ocean heat budget in the northwest Pacific, thus affecting the tropical cyclone and climate variability.
Keywordsalinity north-south contrast northwest Pacific mechanism
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China
2.Univ Bergen, Inst Geophys, Bergen, Norway
3.Bjerknes Ctr Climate Res, Bergen, Norway
4.Nansen Environm & Remote Sensing Ctr, Bergen, Norway
5.State Ocean Adm, South China Sea Marine Predict Ctr, Guangzhou, Guangdong, Peoples R China
Recommended Citation
GB/T 7714
Yan, Youfang,Svendsen, Lea,Wang, Chunzai,et al. A North-South Contrast of Subsurface Salinity Anomalies in the Northwestern Pacific From 2002 to 2013[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2019,124(3):1795, 1806.
APA Yan, Youfang,Svendsen, Lea,Wang, Chunzai,Keenlyside, Noel,&Xu, Dazhi.(2019).A North-South Contrast of Subsurface Salinity Anomalies in the Northwestern Pacific From 2002 to 2013.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,124(3),1795.
MLA Yan, Youfang,et al."A North-South Contrast of Subsurface Salinity Anomalies in the Northwestern Pacific From 2002 to 2013".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 124.3(2019):1795.
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