Analysis of SSH altimetry data collected between 1992 and 2009 demonstrated that mesoscale flow off California consisted of a self-organized system of quasizonal jets, bi-annual oscillations, annual and semiannual Rossby waves as well as mesoscale eddies. The mesoscale variability was driven by near-resonance interactions between different flow scales. Quartet (modulation) instability dominated and caused a nonlocal transfer of energy from waves and eddies to biannual oscillations and quasi-zonal jets. The total number of quartets induced off California was approximately 10 times larger than the number of existing triads. Two types of quartets were identified: (a) quasi-zonal jets, annual and semi-annual waves and eddies, and (b) bi-annual oscillations, semi-annual waves and eddies. Quartet instability required the existence of a certain level of dissipativity in the flow which was demonstrated using an example with bottom friction.
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机译：在1992年至2009年间收集的SSH Altimetry数据分析表明，Messcale Flow Off California由一个自组织的Quasizonal喷气机，双年度振荡，年度和半罗斯比波以及Mesoscale Eddies组成。 Mescle变形是通过不同流量尺度之间的近共振相互作用驱动的。四重奏（调制）不稳定主导并导致从波和漩涡的能量的非识别能量转移到两年振荡和准Zonal射流。从加利福尼亚诱导的四重奏总数约为现有三合会数量的10倍。确定了两种类型的四分之一：（a）准分居喷射，年度和半年波和eddies，（b）双年度振荡，半年波和eddies。四重奏不稳定性需要使用具有底部摩擦的示例来证明流动中的一定耗散度的存在。
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