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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Dynamics of the seasonal variation of the North Equatorial Current bifurcation
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Dynamics of the seasonal variation of the North Equatorial Current bifurcation

机译：赤道北流分叉季节变化的动力学

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摘要

The dynamics of the seasonal variation of the North Equatorial Current (NEC) bifurcation is studied using a 1.5-layer nonlinear reduced-gravity Pacific basin model and a linear, first-mode baroclinic Rossby wave model. The model-simulated bifurcation latitude exhibits a distinct seasonal cycle with the southernmost latitude in June and the northernmost latitude in November, consistent with observational analysis. It is found that the seasonal migration of the NEC bifurcation latitude (NBL) not only is determined by wind locally in the tropics, as suggested in previous studies, but is also significantly intensified by the extratropical wind through coastal Kelvin waves. The model further demonstrates that the amplitude of the NEC bifurcation is also associated with stratification. A strong (weak) stratification leads to a fast (slow) phase speed of first-mode baroclinic Rossby waves, and thus large (small) annual range of the bifurcation latitude. Therefore, it is expected that in a warm climate the NBL should have a large range of annual migration.
机译：使用1.5层非线性减重太平洋盆地模型和线性一阶斜压Rossby波模型研究了北赤道流（NEC）分叉的季节变化动力学。与观测分析一致，由模型模拟的分叉纬度表现出明显的季节周期，其中6月最南端的纬度和11月最北端的纬度。发现，NEC分叉纬度（NBL）的季节性迁移不仅取决于热带地区的风，如先前的研究所述，而且还受到沿海开尔文波的温带风的加剧。该模型进一步证明，NEC分叉的幅度也与分层有关。强（弱）分层会导致第一模式斜斜Rossby波的快速（慢）相速度，从而使分叉纬度的年范围变大（很小）。因此，可以预料，在温暖的气候下，NBL的年迁移量将很大。

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