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DOI	10.1007/s10652-018-9647-z
	A comparison of near-surface potential temperature variance budgets for unstable atmospheric flows with contrasting vegetation cover flat surfaces and a gentle slope
	Hang, Chaoxun; Nadeau, Daniel F.; Pardyjak, Eric R.; Parlange, Marc B.
通讯作者	Hang, CX
来源期刊	ENVIRONMENTAL FLUID MECHANICS
ISSN	1567-7419
EISSN	1573-1510
出版年	2020
卷号	20 期号:5 页码:1251-1279
英文摘要	Over the past decades, researchers have made significant progress toward a fundamental understanding of the budgets of turbulence variables over flat and homogeneous terrain, and only more recently over complex terrain. However, temperature variance budgets, which are parameterized in most meteorological models, are still poorly understood even under relatively idealized conditions. The objective of this study is to analyze the near-surface potential temperature variance budget over contrasting surfaces. To do this, we rely on profiles of near-surface turbulence variables collected as part of the Mountain Terrain Atmospheric Modeling and Observations program. Daytime observations collected in May 2013 in western Utah at three field sites subjected to similar large-scale forcing are analyzed: a desert playa (i.e., dry lakebed), characterized by a flat surface devoid of vegetation; a vegetated site, characterized by a flat valley floor covered with greasewood vegetation, and a slope site with a local slope angle of 2 degrees-4 degrees and covered by 1-m tall sparse desert steppe vegetation. The observations indicate a persistent 5-m surface layer across all three sites, where the flow is equilibrium due to the balance between dominant production and dissipation terms in the potential temperature variance equation. The temperature variances in this layer are well predicted by Monin-Obukhov similarity theory. During convective periods at the Playa and Slope sites, approximate to 60% of the data show a ratio of turbulent transport to production greater than 0.1. Within the surface layer, turbulent transport of potential temperature variance acts as a sink term at all three sites. Neither the ratio of turbulent transport to production nor the ratio of production to dissipation show a dependence on atmospheric stability during the unstable periods studied. A short-period comparison of dissipation rates calculated using dissipation-scale resolving cold-wire anemometry and several common indirect methods using sonic anemometry is presented for data acquired at Playa site. The results indicate that the dissipation rates from all methods follow similar trends, however the values can differ by a factor of 2-3.
英文关键词	Convective boundary layer Dissipation of temperature variance Dryland Eddy covariance Surface layer turbulence profiles
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000581846600005
WOS关键词	TURBULENT KINETIC-ENERGY ; AVERAGE DISSIPATION RATE ; SENSIBLE HEAT-FLUX ; BOUNDARY-LAYER ; SCALAR VARIANCE ; SIMILARITY ; AFTERNOON ; HUMIDITY ; SPECTRA ; TKE
WOS类目	Environmental Sciences ; Mechanics ; Meteorology & Atmospheric Sciences ; Oceanography ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Mechanics ; Meteorology & Atmospheric Sciences ; Oceanography ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327090
作者单位	[Hang, Chaoxun; Parlange, Marc B.] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia; [Hang, Chaoxun; Pardyjak, Eric R.] Univ Utah, Dept Mech Engn, Salt Lake City, UT 84112 USA; [Nadeau, Daniel F.] Univ Laval, Dept Civil & Water Engn, Quebec City, PQ, Canada
推荐引用方式 GB/T 7714	Hang, Chaoxun,Nadeau, Daniel F.,Pardyjak, Eric R.,et al. A comparison of near-surface potential temperature variance budgets for unstable atmospheric flows with contrasting vegetation cover flat surfaces and a gentle slope[J],2020,20(5):1251-1279.
APA	Hang, Chaoxun,Nadeau, Daniel F.,Pardyjak, Eric R.,&Parlange, Marc B..(2020).A comparison of near-surface potential temperature variance budgets for unstable atmospheric flows with contrasting vegetation cover flat surfaces and a gentle slope.ENVIRONMENTAL FLUID MECHANICS,20(5),1251-1279.
MLA	Hang, Chaoxun,et al."A comparison of near-surface potential temperature variance budgets for unstable atmospheric flows with contrasting vegetation cover flat surfaces and a gentle slope".ENVIRONMENTAL FLUID MECHANICS 20.5(2020):1251-1279.