地形引起的大气模式的持续性
Topography-induced persistence of atmospheric patterns
摘要：
大气阻塞是一种持续数天至数周的持续性大尺度气候模式。在原则上，阻塞可能涉及大量的模式相互作用的非线性，其发病和持续时间的结论性描述仍然是难以捉摸的。在本文中，我们介绍了一个简化的帐户，这种现象的手段是一个单一的三元组的Rossby-Hasretz波扰动的地形模式。结果表明，在未扰动三元组的相空间中，持续性大气模式的动力学特征具有零测度，但在扰动动力学下，这种测度变为有限。通过这个帐户，我们建议，在二维大气层中的静态不均匀性所需的锁定在真实空间中的流动模式。
英文摘要：
Atmospheric blockings are persistent large-scale climate patterns with duration between days and weeks. In principle, blockings might involve a large number of modes interacting non-linearly, and a conclusive description for their onset and duration is still elusive. In this paper we introduce a simplified account for this phenomena by means of a single-triad of Rossby-Hawritz waves perturbed by one topography mode. It is shown that the dynamical features of persistent atmospheric patterns have zero measure in the phase space of an unperturbed triad, but such measure becomes finite for the perturbed dynamics. By this account we suggest that static inhomogeneities in the two-dimensional atmospheric layer are required for locking flow patterns in real space.
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