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Nonnormal Frontal Dynamics

机译：非正常的额叶动力学

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摘要

The generalized stability of the secondary atmospheric circulation over strong SST fronts is studied using a hydrostatic. Boussinesq, two-dimensional f-plane model. It is shown that even in a parameter regime in which these circulations are stable to small perturbations, significant nonnormal growth of optimal initial perturbations occurs. The maximum growth factor in perturbation total energy is 250 and is dominated by the potential energy, which obtains a growth factor of 219 two to five hours after the beginning of the integration. This domination of potential energy growth is consistent with the observation that the available potential energy (APE) of the secondary circulation is larger by two orders of magnitude than the kinetic energy as well as with the transfer of kinetic to potential perturbation energy at the beginning of the growth of the perturbations. The norm kernel is found to significantly influence the structure of the optimal initial perturbation as well as the energy obtained by the mature perturbations, but the physical mechanism of growth and the structure of the mature perturbations are robust.
机译：使用静水力研究了强SST锋面的次级大气环流的广义稳定性。 Boussinesq，二维f平面模型。结果表明，即使在其中这些环流对小扰动稳定的参数状态下，也会出现最佳初始扰动的明显非正常增长。扰动总能量的最大增长因子为250，并由势能控制，势能在积分开始后两到五个小时获得219的增长因子。这种对势能增长的支配与以下观察一致：二​​次循环的可用势能（APE）比动能大两个数量级，并且与动能开始时的动能转换为势能扰动有关。扰动的增长。发现规范核显着影响最佳初始扰动的结构以及成熟扰动获得的能量，但是增长的物理机制和成熟扰动的结构是健壮的。

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