Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA

doi:10.1007/s13131-011-0114-7

IOCAS-IR > 海洋环流与波动重点实验室

	Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA
	Meng Qingjia 1,2; Wang Fan1 ; Liu Na 3
	2011-05-01
发表期刊	ACTA OCEANOLOGICA SINICA
ISSN	0253-505X
卷号	30 期号:3 页码:14-19
文章类型	Article
摘要	The low-frequency variability of the North Equatorial Current (NEC) bifurcation during 1958 to 2001 was investigated with the Simple Ocean Data Assimilation (SODA) 2.0.2 dataset. In agreement with recent observations, the NEC bifurcation latitude (NBL) shifted northward as depth increases, from about 12.7 degrees N near the surface to about 17.1 degrees N at depths around 500 m for the annual average. This study reveals that the interannual variations of NBL, with five years period, mainly focused on the upper 500 m with amplitude increasing as depth increased. The NBL shifted southward in the past 40 years, which was more significant in the subsurface at more than -0.02 degrees/a. The NBL manifests itself in the transports of NMK (NEC-Mindanao Current (MC)-Kuroshio) system in strong relationship with MC (0.7) and Kuroshio (-0.7). The EOF analysis of meridional velocity off the Philippine coast shows that the first mode, explaining 62% of variance and 5 years period, was highly correlated with the southward shift of NBL with coefficient at about 0.75. The southward shift of NBL consists with the weakening of MC and strengthening of Kuroshio, which exhibited linear trends at -0.24Sv/a and 0.11Sv/a. Both interannual variation and trend of NBL were closely related to the variation of NMK system.; The low-frequency variability of the North Equatorial Current (NEC) bifurcation during 1958 to 2001 was investigated with the Simple Ocean Data Assimilation (SODA) 2.0.2 dataset. In agreement with recent observations, the NEC bifurcation latitude (NBL) shifted northward as depth increases, from about 12.7 degrees N near the surface to about 17.1 degrees N at depths around 500 m for the annual average. This study reveals that the interannual variations of NBL, with five years period, mainly focused on the upper 500 m with amplitude increasing as depth increased. The NBL shifted southward in the past 40 years, which was more significant in the subsurface at more than -0.02 degrees/a. The NBL manifests itself in the transports of NMK (NEC-Mindanao Current (MC)-Kuroshio) system in strong relationship with MC (0.7) and Kuroshio (-0.7). The EOF analysis of meridional velocity off the Philippine coast shows that the first mode, explaining 62% of variance and 5 years period, was highly correlated with the southward shift of NBL with coefficient at about 0.75. The southward shift of NBL consists with the weakening of MC and strengthening of Kuroshio, which exhibited linear trends at -0.24Sv/a and 0.11Sv/a. Both interannual variation and trend of NBL were closely related to the variation of NMK system.
关键词	North Equatorial Current Bifurcation Latitude Interannual Variation Linear Trend Nec-mindanao Current-kuroshio System
学科领域	Oceanography
DOI	10.1007/s13131-011-0114-7
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000292673000002
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/11585
专题	海洋环流与波动重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Ocean Circulat & Waves KLOCAW, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Natl Marine Environm Forecasting Ctr, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Meng Qingjia,Wang Fan,Liu Na. Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA[J]. ACTA OCEANOLOGICA SINICA,2011,30(3):14-19.
APA	Meng Qingjia,Wang Fan,&Liu Na.(2011).Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA.ACTA OCEANOLOGICA SINICA,30(3),14-19.
MLA	Meng Qingjia,et al."Low-frequency variability of the North Equatorial Current bifurcation in the past 40 years from SODA".ACTA OCEANOLOGICA SINICA 30.3(2011):14-19.

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