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首页> 外文期刊>Journal of the Atmospheric Sciences >Gravity Wave-Fine Structure Interactions. Part II: Energy Dissipation Evolutions, Statistics, and Implications
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Gravity Wave-Fine Structure Interactions. Part II: Energy Dissipation Evolutions, Statistics, and Implications

机译：重力波-精细结构相互作用。第二部分：能量耗散的演变，统计和含义

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摘要

Part I of this paper employs four direct numerical simulations (DNSs) to examine the dynamics and energetics of idealized gravity wave-fine structure (GW-FS) interactions. That study and this companion paper were motivated by the ubiquity of multiscale GW-FS superpositions throughout the atmosphere. These DNSs exhibit combinations of wave-wave interactions and local instabilities that depart significantly from those accompanying idealized GWs or mean flows alone, surprising dependence of the flow evolution on the details of the FS, and an interesting additional pathway to instability and turbulence due to GW-FS superpositions. This paper examines the mechanical and thermal energy dissipation rates occurring in two of these DNSs. Findings include 1) dissipation that tends to be much more localized and variable than that due toGW instability in the absence of FS, 2) dissipation statistics indicative of multiple turbulence sources, 3) strong influences of FS shears on instability occurrence and turbulence intensities and statistics, and 4) significant differences between mechanical and thermal dissipation rate fields having potentially important implications for measurements of these flows.
机译：本文的第一部分采用四个直接数值模拟（DNS）来研究理想化重力波-精细结构（GW-FS）相互作用的动力学和能量学。这项研究和这篇伴随论文的动机是整个大气层普遍存在多尺度GW-FS叠加。这些DNS表现出波-波相互作用和局部不稳定性的组合，与理想的GW或单独的平均流量相去甚远，流动演化对FS细节的出乎意料的依赖性，以及由GW引起的不稳定和湍流的有趣途径-FS叠加。本文研究了其中两个DNS中发生的机械和热能耗散率。研究结果包括：1）与不存在FS时由于GW不稳定性而导致的耗散相比，其局限性和可变性要大得多; 2）表示多个湍流源的耗散统计数据; 3）FS剪切对不稳定性发生和湍流强度的强烈影响和统计数据，以及4）机械和热耗散率场之间的显着差异，对这些流量的测量具有潜在的重要意义。

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