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首页> 外文期刊>Journal of Physical Oceanography >Eddy-Wind Interaction in the California Current System: Dynamics and Impacts
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Eddy-Wind Interaction in the California Current System: Dynamics and Impacts

机译：加州现行系统中的涡-风相互作用：动力学和影响

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The summertime California Current System (CCS) is characterized by energetic mesoscale eddies, whose sea surface temperature (SST) and surface current can significantly modify the wind stress and Ekman pumping. Relative importance of the eddy-wind interactions via SST and surface current in the CCS is examined using a high-resolution (7 km) regional coupled model with a novel coupling approach to isolate the small-scale air-sea coupling by SST and surface current. Results show that when the eddy-induced surface current is allowed to modify the wind stress, the spatially averaged surface eddy kinetic energy (EKE) is reduced by 42%, and this is primarily due to enhanced surface eddy drag and reduced wind energy transfer. In contrast, the eddy-induced SST-wind coupling has no significant impact on the EKE. Furthermore, eddy-induced SST and surface current modify the Ekman pumping via their crosswind SST gradient and surface vorticity gradient, respectively. The resultant magnitudes of the Ekman pumping velocity are comparable, but the implied feedback effects on the eddy statistics are different. The surface current-induced Ekman pumping mainly attenuates the amplitude of cyclonic and anticyclonic eddies, acting to reduce the eddy activity, while the SST-induced Ekman pumping primarily affects the propagation. Time mean-rectified change in SST is determined by the altered offshore temperature advection by the mean and eddy currents, but the magnitude of the mean SST change is greater with the eddy-induced current effect. The demonstrated remarkably strong dynamical response in the CCS system to the eddy-induced current-wind coupling indicates that eddy-induced current should play an important role in the regional coupled ocean-atmosphere system.
机译：夏季的加利福尼亚洋流系统（CCS）具有高能量的中尺度涡旋，其海面温度（SST）和地表电流可以显着改变风应力和埃克曼抽水。通过高分辨率（7 km）区域耦合模型和新颖的耦合方法，通过SST和地表电流隔离小规模海-气耦合，研究了CCS中通过SST和地表电流涡流相互作用的相对重要性。 。结果表明，当允许涡流引起的表面电流改变风应力时，空间平均表面涡动能（EKE）降低了42％，这主要是由于增强了表面涡流阻力和减少了风能传递。相反，涡流引起的SST-风耦合对EKE没有明显影响。此外，涡流引起的SST和表面电流分别通过其侧风SST梯度和表面涡度梯度来改变Ekman抽运。 Ekman抽速的结果大小是可比较的，但是对涡流统计的隐含反馈效果是不同的。表面电流引起的埃克曼泵浦作用主要减弱了旋风和反气旋涡流的振幅，从而降低了涡流活动，而SST引起的埃克曼泵浦作用主要影响了传播。 SST的时间平均校正变化取决于海洋平均对流和涡流的变化，但随着涡流效应的影响，SST平均变化的幅度更大。在CCS系统中，涡流引起的风-风耦合表现出非常强的动力响应，这表明涡流在区域性海洋-大气系统中应起重要作用。

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