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首页> 外文期刊>Journal of Physical Oceanography >The Ocean Mesoscale Regime of the Reduced-Gravity Quasigeostrophic Model
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The Ocean Mesoscale Regime of the Reduced-Gravity Quasigeostrophic Model

机译：重力降低的准地转型模型的海洋中尺度制度

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A statistical-equilibrium, geostrophic-turbulence regime of the stochastically forced, one-layer, reduced-gravity, quasigeostrophic model is identified in which the numerical solutions are representative of global mean, midlatitude, open-ocean mesoscale variability. Solutions are forced near the internal deformation wavenumber and damped linearly and by high-wavenumber enstrophy dissipation. The results partially rationalize a recent semiempirical stochastic field model of mesoscale variability motivated by a global eddy identification and tracking analysis of two decades of satellite altimeter sea surface height (SSH) observations. Comparisons of model results with observed SSH variance, autocorrelation, eddy, and spectral statistics place constraints on the model parameters. A nominal best fit is obtained for a dimensional SSH stochastic-forcing variance production rate of 1/4 cm(2) day(-1), an SSH damping rate of 1/62 week(-1), and a stochastic forcing autocorrelation time scale near or greater than 1 week. This ocean mesoscale regime is nonlinear and appears to fall near the stochastic limit, at which wave-mean interaction is just strong enough to begin to reduce the local mesoscale variance production, but is still weak relative to the overall nonlinearity. Comparison of linearly inverted wavenumber-frequency spectra shows that a strong effect of nonlinearity, the removal of energy from the resonant linear wave field, is resolved by the gridded altimeter SSH data. These inversions further suggest a possible signature in the merged altimeter SSH dataset of signal propagation characteristics from the objective analysis procedure.
机译：确定了随机强迫，单层，重力减小的准营养模式的统计平衡，地转湍流状态，其中的数值解代表了全球平均，中纬度，开海中尺度变率。解决方案被迫靠近内部变形波数并被线性和高波数涡旋消散线性阻尼。结果部分合理化了最近的半尺度随机半场随机模型，该模型由全球涡流识别和对二十年来卫星高度计海面高度（SSH）观测值的跟踪分析推动。将模型结果与观察到的SSH方差，自相关，涡流和频谱统计进行比较，会对模型参数施加约束。对于尺寸为1/4 cm（2）day（-1）的SSH随机强迫变化率，1/62 week（-1）的SSH阻尼率和随机强迫自相关时间，可以获得标称的最佳拟合。规模接近或大于1周。该海洋中尺度状态是非线性的，并且似乎落在随机极限附近，在该极限处，波均值相互作用刚好足以开始减少局部中尺度变化产生，但相对于整体非线性而言仍然很弱。线性倒波数频谱的比较表明，网格高度计SSH数据解决了非线性的强大影响，即从共振线性波场中去除了能量。这些反演进一步表明来自目标分析程序的信号传播特性的合并高度计SSH数据集中可能存在签名。

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