Bifurcation of Pacific North Equatorial Current at the surface |
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| Authors: | QingYe Wang RuiXue Cao ShuWen Zhang DunXin Hu |
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| Institution: | (1) South China Sea Environmental Institute, Guangdong Ocean University, Zhanjiang, 524088, China;(2) Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China |
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| Abstract: | The grid altimetry data between 1993 and 2006 near the Philippines were analyzed by the method of Empirical Orthogonal Function
(EOF) to study the variation of bifurcation of the North Equatorial Current at the surface of the Pacific. The relatively
short-term signals with periods of about 6 months, 4 months, 3 months and 2 months are found besides seasonal and interannual
variations mentioned in previous studies. Local wind stress curl plays an important role in controlling variation of bifurcation
latitude except in the interannual timescale. The bifurcation latitude is about 13.3°N in annual mean state and it lies at
the northernmost position (14.0°N) in January, at the southernmost position (12.5°N) in July. The amplitude of variation of
bifurcation latitude in a year is 1.5°, which can mainly be explained as the contributions of the signals with periods of
about 1 year (1.2°) and 0.5 year (0.3°).
Supported by National Basic Research Program of China (Grant No. 2007CB411802), National Natural Science Foundation of China
(Grant Nos. 40806012, 40876013), Open Fund of the Key Laboratory of Ocean Circulation and Waves, Chinese Academy of Sciences
(Grant No. KLOCAW0803) and Scientific Research Foundation for Talent, Guangdong Ocean University (Grant No. E06118) |
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| Keywords: | bifurcation North Equatorial Current variation Empirical Orthogonal Function |
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