论文标题
海洋双动力学级联及其季节性的直接观察证据
Direct observational evidence of an oceanic dual kinetic energy cascade and its seasonality
论文作者
论文摘要
海洋的湍流能量周期具有悖论。在地球旋转控制下，大规模涡流主要将动能（KE）通过反级联反向传递到较大的尺度，而需要向较小的尺度转移以完成耗散。使用数值模拟来争辩，正面，波浪和其他湍流结构可以产生朝向耗散尺度的ke的正向级联。然而，在观察结果中尚未确认这种向前的级联反应及其与已知的逆级联的共存。在这里，我们通过分析墨西哥湾释放的表面漂移器的速度测量值来介绍海洋双重级别级联反应的第一个证据。我们的结果表明，KE以两个主导尺度注入，并转移到大小尺度上，下尺度的通量在小于〜1-10km的尺度上占主导地位。级联速率在季节性调制，冬季更强烈的KE注入和正向转移。
The Ocean's turbulent energy cycle has a paradox; large-scale eddies under the control of Earth's rotation primarily transfer kinetic energy (KE) to larger scales via an inverse cascade, while a transfer to smaller scales is needed to accomplish dissipation. It has been argued, using numerical simulations, that fronts, waves and other turbulent structures can produce a forward cascade of KE toward dissipation scales. However, this forward cascade and its coexistence with known inverse cascade were not confirmed in observations. Here we present the first evidence of a dual KE cascade in the Ocean by analyzing velocity measurements from surface drifters released in the Gulf of Mexico. Our results show that KE is injected at two dominant scales and transferred to both large and small scales, with the downscale flux dominating at scales smaller than ~1-10km. The cascade rates are modulated seasonally, with stronger KE injection and forward transfer during winter.
