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首页> 外文期刊>Journal of Physical Oceanography >Nonnormal Perturbation Growth Of Pure Thermohaline Circulation Using A 2d Zonally Averaged Model
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Nonnormal Perturbation Growth Of Pure Thermohaline Circulation Using A 2d Zonally Averaged Model

机译：使用二维区域平均模型的纯热盐环流的非正态扰动增长

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Generalized linear stability theory is used to calculate the optimal initial conditions that result in transient amplification of the thermohaline circulation (THC) in a zonally averaged single-basin ocean model. The eigenmodes of the tangent linear model verify that the system is asymptotically stable, but the nonnormality of the system permits the growth of perturbations for a finite period through the interference of non-orthogonal eigenmodes. It is found that the maximum amplification of the THC anomalies occurs after 6 yr with both the thermally and salinity-driven components playing major roles in the amplification process. The transient amplification of THC anomalies is due to the constructive and destructive interference of a large number of eigenmodes, and the evolution over time is determined by how the interference pattern evolves. It is found that five of the most highly nonnormal eigenmodes are critical to the initial cancellation of the salinity and temperature contributions to the THC, while 11 oscillating modes with decay time scales ranging from 2 to 6 yr are the major contributors at the time of maximum amplification. This analysis demonstrates that the different dynamics of salinity and temperature anomalies allow the dramatic growth of perturbations to the THC on relatively short (interannual to decadal) time scales.
机译：广义线性稳定性理论用于计算最佳初始条件，该最优初始条件导致区域平均单盆海洋模型中热盐环流（THC）的瞬时放大。切线线性模型的本征模验证了系统是渐近稳定的，但是系统的非正态性允许通过非正交本征模的干扰在有限的时间内增加扰动。发现THC异常的最大放大发生在6年之后，而热和盐度驱动的组件在放大过程中均起主要作用。 THC异常的瞬态放大是由于大量本征模式的相长干涉和相消干涉所致，随时间的演变取决于干涉图样的演变。结果发现，五个高度非正态本征模式对于盐度和温度对THC的初始贡献的取消至关重要，而衰减时间范围为2至6年的11种振荡模式是最大时的主要贡献者。放大。该分析表明，盐度和温度异常的不同动态使得在相对较短的（年际至年代际）时间尺度上对THC的扰动急剧增加。

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