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

文献类型：期刊论文

作者Meng Qingjia1,2; Wang Fan1; Liu Na3
刊名ACTA OCEANOLOGICA SINICA
出版日期2011-05-01
卷号30期号:3页码:14-19
关键词North Equatorial Current Bifurcation Latitude Interannual Variation Linear Trend Nec-mindanao Current-kuroshio System
ISSN号0253-505X
DOI10.1007/s13131-011-0114-7
文献子类Article
英文摘要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.
学科主题Oceanography
URL标识查看原文
语种英语
WOS记录号WOS:000292673000002
公开日期2012-07-03
源URL[http://ir.qdio.ac.cn/handle/337002/11586]  
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, 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.

入库方式： OAI收割

来源：海洋研究所

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