气候变化领域集成服务门户(CCPortal): Katabatic Flow Structures Indicative of the Flux Dissimilarity for Stable Stratification

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DOI	10.1007/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
ISSN	0006-8314
EISSN	1573-1472
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 NUMBER BOUNDARY-LAYER SURFACE-LAYER COHERENT STRUCTURES QUADRANT ANALYSIS MIDLATITUDE GLACIER MOMENTUM-TRANSFER REYNOLDS STRESS CARBON-DIOXIDE ENERGY 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).