Spreading and salinity change of North Pacific Tropical Water in the Philippine Sea

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Spreading and salinity change of North Pacific Tropical Water in the Philippine Sea
	Li, Yuanlong 1,2; Wang, Fan1
刊名	JOURNAL OF OCEANOGRAPHY
	2012-06-01
卷号	68 期号:3 页码:439-452
关键词	North Pacific Tropical Water Philippine Sea NEC bifurcation Mesoscale eddies Mixing Kuroshio Mindanao current
ISSN号	0916-8370
通讯作者	Wang, F (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Peoples R China.
英文摘要	Newly formed North Pacific Tropical Water (NPTW) is carried to the Philippine Sea (PS) by the North Equatorial Current (NEC) as a subsurface salinity maximum. In this study its spreading and salinity change processes are explored using existing hydrographic data of the World Ocean Database 2009 and Argo floats. Spreading of NPTW is closely associated with the transports of the NEC, Mindanao Current (MC), and Kuroshio. Estimated for subsurface water with salinity S greater than 34.8 psu, the southward (northward) geostrophic transport of NPTW by the MC (Kuroshio) at 8 degrees N (18 degrees N) is about 4.4 (5.7) Sv (1 Sv = 10(6) m(3) s(-1)), which is not sensitive to reference level choice. Fields of salinity maximum, geostrophic current, sea level variation, and potential vorticity suggest that the equatorward spreading of NPTW to the tropics is primarily afforded by the MC, whereas its poleward spreading is achieved by both the Kuroshio transport along the coast and open-ocean mesoscale eddy fluxes in the northern PS. The NPTW also undergoes a prominent freshening in the PS. Lying beneath fresh surface water, salinity decreases quicker in the upper part of the NPTW, which gradually lowers the salinity maximum of NPTW to denser isopycnals. Salinity decrease is especially fast in the MC, with along-path decreasing rate reaching O (10(-7) psu s(-1)). Both diapycnal and isopycnal mixing effects are shown to be elevated in the MC owing to enhanced salinity gradient near the Mindanao Eddy. These results suggest intensive dispersion of thermal anomalies along the subtropical-to-tropical thermocline water pathway near the western boundary.
学科主题	Oceanography
收录类别	SCI
原文出处	10.1007/s10872-012-0110-3
语种	英语
WOS记录号	WOS:000307296300006
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/12188]
专题	海洋研究所_海洋环流与波动重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Li, Yuanlong,Wang, Fan. Spreading and salinity change of North Pacific Tropical Water in the Philippine Sea[J]. JOURNAL OF OCEANOGRAPHY,2012,68(3):439-452.
APA	Li, Yuanlong,&Wang, Fan.(2012).Spreading and salinity change of North Pacific Tropical Water in the Philippine Sea.JOURNAL OF OCEANOGRAPHY,68(3),439-452.
MLA	Li, Yuanlong,et al."Spreading and salinity change of North Pacific Tropical Water in the Philippine Sea".JOURNAL OF OCEANOGRAPHY 68.3(2012):439-452.