非线性开尔文波的参量相互作用和强化
Parametric interaction and intensification of nonlinear Kelvin waves
摘要：
本文给出了日本/东海背景沿岸流的潮汐- $ω_t$或惯性- $ω_i$频率的中尺度内开尔文波与天气-$Ω$频率振荡之间的非线性相互作用的观测证据。增强沿海流的总和- $ω_+ $和dif - $ω_-$频率：$ω_\pm =ω_{t,i}\pm Ω$具有传播开尔文波的属性，这表明从天气带到中尺度$ω_\pm $带的永久能量交换。这种相互作用可能是造成边界捕获和赤道捕获的开尔文波的强度大于预期、变陡和破裂的原因，这可能会影响厄尔尼诺现象。利用非线性弱色散波理论研究了频率为$ω$的非线性Kelvin波与代表频率为$Ω\llω$的低频窄带鼻的参数相互作用问题。
英文摘要：
Observational evidence is presented for nonlinear interaction between mesoscale internal Kelvin waves at the tidal -- $ω_t$ or the inertial -- $ω_i$ frequency and oscillations of synoptic -- $Ω$ frequency of the background coastal current of Japan/East Sea. Enhanced coastal currents at the sum -- $ω_+ $ and dif -- $ω_-$ frequencies: $ω_\pm =ω_{t,i}\pm Ω$ have properties of propagating Kelvin waves suggesting permanent energy exchange from the synoptic band to the mesoscale $ω_\pm $ band. The interaction may be responsible for the greater than predicted intensification, steepen and break of boundary trapped and equatorially trapped Kelvin waves, which can affect El Niño. The problem on the parametric interaction of the nonlinear Kelvin wave at the frequency $ω$ and the low-frequency narrow-band nose with representative frequency $Ω\llω$ is investigated with the theory of nonlinear week dispersion waves.
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