Stratospheric tracer spectra
Stratospheric tracer spectra
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平流层示踪光谱
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
J. Vanneste
中科院分区：
文献类型：
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作者：
P. Haynes;J. Vanneste
摘要考虑了平流和扩散对空间变化由大尺度强迫维持的示踪物平衡空间结构的综合影响。在低平流层的激励下，这种流动被认为是大尺度的、时变的、纯水平的、垂直变化的，垂直切变比水平速度梯度大得多。因此，水平和垂直示踪标尺之间的比例α很大。(对于平流层较低的冲浪区，α已被证明约为250。)扩散将小尺度过程的混合效应参数化。三维空间尺度和强迫尺度和扩散尺度之间的大范围意味着直接数值模拟对于这个问题将是昂贵得令人望而却步的。取而代之的是，使用了集合方法，该方法利用了流动的大尺度和示踪剂分布的小尺度之间的分离。这一方法，以前已经被使用过，我……
Abstract The combined effects of advection and diffusion on the equilibrium spatial structure of a tracer whose spatial variation is maintained by a large-scale forcing are considered. Motivated by the lower stratosphere, the flow is taken to be large-scale, time-dependent, and purely horizontal but varying in the vertical, with the vertical shear much larger than horizontal velocity gradients. As a result, the ratio α between horizontal and vertical tracer scales is large. (For the lower stratospheric surf zone α has been shown to be about 250.) The diffusion parameterizes the mixing effects of small-scale processes. The three space dimensions and the large range between the forcing scale and the diffusive scale mean that direct numerical simulation would be prohibitively expensive for this problem. Instead, an ensemble approach is used that takes advantage of the separation between the large scale of the flow and the small scale of the tracer distribution. This approach, which has previously been used i...