Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL091123 |
Revealing the Dynamical Transition of Anisotropy behind the HOST by Koopman Analysis | |
Licheng Li; Hongchao Zuo; Bolong Chen; Yang Guo; Mengmeng Ma; Longxiang Dong | |
2020-11-09 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2020 |
英文摘要 | The hockey‐stick transition (HOST), which is depicted by the ‘local and global shear’ assumption, about the turbulence kinetic energy with the averaged flow intensity is noticed widely. However, the intrinsic mechanism of averaged flow influences turbulence kinetic energy via shear and buoyancy is missing. In this research, we deploy the Koopman operator to expose invariant subspaces of the Ri series to identify the quasi‐periodic coherent structures from the single tower observation. Analysis of turbulence fluxes and anisotropy demonstrates the mechanism, i.e. horizontal kinetic energy coupled with vertical downward flux, whereby anisotropy evolution is changed. Examining the anisotropy invariants changing with kinetic energy reveals a dynamical transition that determines the threshold of HOST. Moreover, the mechanism about how the shear and vertical momentum influences the transition point of HOST is at first given by a group of a quadratic relationship when the anisotropy crossed over the transition point. |
领域 | 气候变化 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/303927 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Licheng Li,Hongchao Zuo,Bolong Chen,et al. Revealing the Dynamical Transition of Anisotropy behind the HOST by Koopman Analysis[J]. Geophysical Research Letters,2020. |
APA | Licheng Li,Hongchao Zuo,Bolong Chen,Yang Guo,Mengmeng Ma,&Longxiang Dong.(2020).Revealing the Dynamical Transition of Anisotropy behind the HOST by Koopman Analysis.Geophysical Research Letters. |
MLA | Licheng Li,et al."Revealing the Dynamical Transition of Anisotropy behind the HOST by Koopman Analysis".Geophysical Research Letters (2020). |
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