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Water masses in the far western equatorial Pacific during the winters of 2010 and 2012
Li Bo3,4; Yuan Dongliang1,2; Zhou Hui
AbstractConductivity-temperature-depth (CTD) data obtained during the 2010 La Nina winter and the 2012 normal winter, combined with concurrent Argo profiling float data, provide a quasi-synoptic description of the water mass distributions and their variations in the far western equatorial Pacific Ocean. The water mass connection between the western Pacific and the east Indonesian seas is emphasized. Analysis indicates that the North Pacific Tropical Water (NPTW, S>34.9) carried by the Mindanao Current southward and the South Pacific Tropical Water (SPTW, S>35.1) from the southern hemisphere meet in the area. Observations suggest that the southward transport of the NPTW is stronger in 2010 than in 2012 due to enhanced advection of the Mindanao Current. The distribution of SPTW, which crosses the equator in the northwest direction and retroflects back to the interior Pacific Ocean, is found to retreat from 4 degrees-5 degrees N in 2012 to 2 degrees-3 degrees N in 2010 La Nina peak in the 130 degrees E section. A relatively fresh tropical subsurface water is identified in between the NPTW and the SPTW, moving eastward with the North Equatorial Countercurrent into the equatorial Pacific Ocean. However, the salinity maximum of this subsurface fresh water is found to decrease eastward, suggesting that the salinity maximum is generated either by strong diapycnal mixing or by isopycnal mixing of temporally entrained Indonesian sea water into the area.
Keywordfar western equatorial Pacific North Pacific Tropic Water South Pacific Tropical Water tropical subsurface water La Nina
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao 266000, Peoples R China
3.Qingdao Collaborat Innovat Ctr Marine Sci & Techn, Qingdao 266000, Peoples R China
4.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li Bo,Yuan Dongliang,Zhou Hui. Water masses in the far western equatorial Pacific during the winters of 2010 and 2012[J]. JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2018,36(5):1459, 1474.
APA Li Bo,Yuan Dongliang,&Zhou Hui.(2018).Water masses in the far western equatorial Pacific during the winters of 2010 and 2012.JOURNAL OF OCEANOLOGY AND LIMNOLOGY,36(5),1459.
MLA Li Bo,et al."Water masses in the far western equatorial Pacific during the winters of 2010 and 2012".JOURNAL OF OCEANOLOGY AND LIMNOLOGY 36.5(2018):1459.
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