Article

Journal of Ocean University of China

, Volume 10, Issue 4, pp 305-313

Numerical study on the bifurcation of the North Equatorial Current

  • Yulong LiuAffiliated withDepartment of Marine Meteorology, Ocean University of ChinaNational Marine Data and Information Service
  • , Qi WangAffiliated withDepartment of Marine Meteorology, Ocean University of China Email author 
  • , Jun SongAffiliated withNational Marine Data and Information Service
  • , Xiande ZhuAffiliated withDepartment of Marine Meteorology, Ocean University of ChinaPeople’s Liberation Army 91422
  • , Xiaoqing GongAffiliated withDepartment of Marine Meteorology, Ocean University of China
  • , Fang WuAffiliated withDepartment of Marine Meteorology, Ocean University of China

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Abstract

A 1.5-layer reduced-gravity model forced by wind stress is used to study the bifurcations of the North Equatorial Current (NEC). The authors found that after removing the Ekman drift, the modelled circulations can serve well as a proxy of the SODA circulations on the σ θ =25.0 kg m−3 potential density surface based on available long-term reanalysis wind stress data. The modelled results show that the location of the western boundary bifurcation of the NEC depends on both zonal averaged and local zero wind stress curl latitude. The effects of the anomalous wind stress curl added in different areas are also investigated and it is found that they can change the strength of the Mindanao Eddy (ME), and then influence the interior pathway.

Keyword

North Equatorial Current the western boundary interior pathway bifurcation wind stress curl 1&1/2 Model