Statistical State Dynamics of Jet–Wave Coexistence in Barotropic Beta-Plane Turbulence
Statistical State Dynamics of Jet–Wave Coexistence in Barotropic Beta-Plane Turbulence
复制标题
正压β平面湍流中射流-波共存的统计状态动力学
DOI：
10.1175/jas-d-15-0288.1
复制
发表时间：
2015
影响因子：
3.1
通讯作者：
P. Ioannou
中科院分区：
文献类型：
--
作者：
N. Constantinou;B. Farrell;P. Ioannou
摘要在行星大气湍流中，射流与行星尺度波共存。这些结构的相干成分来自于相干结构和它们所嵌入的非相干小尺度湍流之间的协同相互作用。由此可见，对喷流和行星尺度波动力学的理论认识需要采用统计状态动力学（SSD）的视角，它包括湍流状态下相干和非相干分量之间相互作用的动力学。在这项工作中，使用SSD的随机结构稳定性理论（S3T）实现正压β平面湍流，通过将由带状喷流组成的相干运动以及选择的大尺度波与构成非相干分量的较小尺度运动分离开来，建立了射流共存状态的理论。发现平均流动-湍流相互作用会产生与大尺度气流共存的射流。
AbstractJets coexist with planetary-scale waves in the turbulence of planetary atmospheres. The coherent component of these structures arises from cooperative interaction between the coherent structures and the incoherent small-scale turbulence in which they are embedded. It follows that theoretical understanding of the dynamics of jets and planetary-scale waves requires adopting the perspective of statistical state dynamics (SSD), which comprises the dynamics of the interaction between coherent and incoherent components in the turbulent state. In this work, the stochastic structural stability theory (S3T) implementation of SSD for barotropic beta-plane turbulence is used to develop a theory for the jet–wave coexistence regime by separating the coherent motions consisting of the zonal jets together with a selection of large-scale waves from the smaller-scale motions that constitute the incoherent component. It is found that mean flow–turbulence interaction gives rise to jets that coexist with large-scale ...