干旱区生态环境知识资源中心(Arid): Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales

Arid

DOI	10.1029/2018JD029614
	Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales
	Comola, F.1; Giometto, M. G.2; Salesky, S. T.3; Parlange, M. B.4; Lehning, M.1,5
通讯作者	Comola, F.
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN	2169-897X
EISSN	2169-8996
出版年	2019
卷号	124 期号:14 页码:7951-7974
英文摘要	Preferential deposition of snow and dust over complex terrain is responsible for a wide range of environmental processes and accounts for a significant source of uncertainty in the surface mass balances of cold and arid regions. Despite the growing body of literature on the subject, previous studies reported contradictory results on the location and magnitude of deposition maxima and minima. This study aims at unraveling the governing processes of preferential deposition in a neutrally stable atmosphere and to reconcile seemingly inconsistent results of previous works. For this purpose, a comprehensive modeling approach is developed, based on large eddy simulations of the turbulent airflow, Lagrangian stochastic model of particle trajectories, and immersed boundary method to represent the underlying topography. The model is tested against wind tunnel measurements of dust deposition around isolated and sequential hills. A scale analysis is then performed to investigate the dependence of snowfall deposition on the particle Froude and Stokes numbers, which fully account for the governing processes of inertia, flow advection, and gravity. Model results suggest that different deposition patterns emerge from different combinations of dimensionless parameters, with deposition maxima located either on the windward or the leeward slope of the hill. Additional simulations are performed, to test whether the often used assumption of inertialess particles yields accurate deposition patterns. Results indicate that this assumption can be justified when snowflakes present dendritic shape but may generate unrealistic results for rounded particles. We finally show that our scale analysis provides qualitatively similar results for hills with different aspect ratios.
英文关键词	atmospheric boundary layer turbulence snowfall large eddy simulation Lagrangian stochastic model immersed boundary method
类型	Article
语种	英语
国家	Switzerland ; USA ; Australia
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000481444200029
WOS关键词	LARGE-EDDY SIMULATIONS ; SOLID PARTICLES ; TURBULENT-FLOW ; WIND-TUNNEL ; MODEL ; ACCUMULATION ; TEMPERATURE ; VARIABILITY ; TREES
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217073
作者单位	1.Ecole Polytech Fed Lausanne, Sch Architecture Civil & Environm Engn, Lausanne, Switzerland; 2.Columbia Univ, Dept Civil Engn & Engn Mech, New York, NY 10027 USA; 3.Univ Oklahoma, Sch Meteorol, Norman, OK 73019 USA; 4.Monash Univ, Dept Civil Engn, Melbourne, Vic, Australia; 5.WSL Inst Snow & Avalanche Res SLF, Davos, Switzerland
推荐引用方式 GB/T 7714	Comola, F.,Giometto, M. G.,Salesky, S. T.,et al. Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales[J],2019,124(14):7951-7974.
APA	Comola, F.,Giometto, M. G.,Salesky, S. T.,Parlange, M. B.,&Lehning, M..(2019).Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(14),7951-7974.
MLA	Comola, F.,et al."Preferential Deposition of Snow and Dust Over Hills: Governing Processes and Relevant Scales".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.14(2019):7951-7974.