Path transition of the western boundary current with a gap due to mesoscale eddies: a 1.5-layer, wind-driven experiment |
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Authors: | Po Hu Yijun Hou |
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Institution: | (1) Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academic of Science, 7 Nanhai Road, Qingdao, 266071, Shandong, People’s Republic of China;(2) State Key Laboratory of Oceanography in the Tropics, South China Sea Institute of Oceanology, Chinese Academic of Science, 164 West Xingang Road, Guangzhou, 510301, Guangdong, People’s Republic of China |
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Abstract: | Using a 1.5 layer nonlinear shallow-water reduced-gravity model, we executed numerical simulations to investigate the possibility
of a western boundary current (WBC) path transition due to mesoscale eddies based on the background of the Kuroshio intrusion
into the South China Sea (SCS) from the Luzon Strait. Because the WBC existed different current states with respect to different
wind stress control parameters, we chose three steady WBC states (loop current, eddy shedding and leaping) as the background
flow field and simulated the path transition of the WBC due to mesoscale eddies. Our simulations indicated that either an
anticyclonic or cyclonic eddy can lead to path transition of the WBC with different modes. The simulation results also show
that the mesoscale eddies can lead to path transition of the WBC from loop and eddy shedding state to leaping state because
of the hysteresis effect. The leaping state is relatively stable compared with the mesoscale eddies. Moreover, an anticyclonic
eddy is more effective in producing the WBC path transition for the path transition than a cyclonic eddy. Our results may
help to explain some phenomena observed regarding the path transition of the Kuroshio due to the mesoscale eddies at the Luzon
Strait. |
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