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DOI10.1007/s10546-021-00660-y
Katabatic Flow Structures Indicative of the Flux Dissimilarity for Stable Stratification
Guo, Xiaofeng; Yang, Wei; Gao, Zhiqiu; Wang, Linlin; Hong, Jinkyu; Ding, Baohong; Zhao, Long; Zhou, Degang; Yang, Kun
通讯作者Guo, XF (通讯作者)
发表日期2022
ISSN0006-8314
EISSN1573-1472
起始页码379
结束页码415
卷号182期号:3
英文摘要Based on observations over an alpine glacier, we investigate the turbulent flux dissimilarity between momentum and sensible heat transfer in a stably stratified katabatic flow. The flux correlation coefficient RF is employed as a measure of variable levels of the flux similarity, which are found to be modulated by the anisotropy of turbulence. In the katabatic wind regime over this glacier, heat is transported more efficiently than momentum. Based on quadrant analysis, the sweep-ejection differences in the flux fraction constitute turbulence characteristics in terms of the velocity aspect ratio, which unravel dissimilar transport of momentum and heat. Moreover, an innovative method is established for connecting quadrant analysis and cospectral analysis, whereby the hyperbolic quadrant hole size is coupled to the frequency underlying the fast Fourier transform. In extending applications of octant analysis, we introduce a hypothetical octant hole, whose size is solicited as a proxy for the amplitude scale of fluctuating fluxes. The contributions to R-F can then be quantified for eddy structures that are associated with different amplitude scales. The katabatic flow structures identified from octant analysis differ in their behaviour so helping illuminate the outcome of flux dissimilarity. Exhibited as a statistical behaviour regardless of amplitude scale, along-wind rapid motions of heated air parcels can modify fractional contributions to the heat flux instead of the momentum flux, with reductions in R F related to decreasing heat-flux fractions. Besides, along-wind slow motions of cooled air parcels cannot modify the flux fractions for both momentum and heat. Thus, the flux dissimilarity due to lowspeed low-temperature eddies cannot be explicable in terms of the flux fractions alone. These findings are an incipient step towards physical understanding of the turbulent flux dissimilarity for a stably stratified katabatic flow.
关键词TURBULENT PRANDTL NUMBERBOUNDARY-LAYERSURFACE-LAYERCOHERENT STRUCTURESQUADRANT ANALYSISMIDLATITUDE GLACIERMOMENTUM-TRANSFERREYNOLDS STRESSCARBON-DIOXIDEENERGY FLUXES
英文关键词Katabatic flow structures; Momentum and heat transfer; Octant analysis; Stable boundary layer; Turbulent flux dissimilarity
语种英语
WOS研究方向Meteorology & Atmospheric Sciences
WOS类目Meteorology & Atmospheric Sciences
WOS记录号WOS:000695767000001
来源期刊BOUNDARY-LAYER METEOROLOGY
来源机构中国科学院青藏高原研究所
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/260694
推荐引用方式
GB/T 7714
Guo, Xiaofeng,Yang, Wei,Gao, Zhiqiu,et al. Katabatic Flow Structures Indicative of the Flux Dissimilarity for Stable Stratification[J]. 中国科学院青藏高原研究所,2022,182(3).
APA Guo, Xiaofeng.,Yang, Wei.,Gao, Zhiqiu.,Wang, Linlin.,Hong, Jinkyu.,...&Yang, Kun.(2022).Katabatic Flow Structures Indicative of the Flux Dissimilarity for Stable Stratification.BOUNDARY-LAYER METEOROLOGY,182(3).
MLA Guo, Xiaofeng,et al."Katabatic Flow Structures Indicative of the Flux Dissimilarity for Stable Stratification".BOUNDARY-LAYER METEOROLOGY 182.3(2022).
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