干旱区生态环境知识资源中心(Arid): Examining relationships between entrainment-driven scalar dissimilarity and surface energy balance underclosure in a semiarid valley

Arid

DOI	10.1016/j.agrformet.2020.108272
	Examining relationships between entrainment-driven scalar dissimilarity and surface energy balance underclosure in a semiarid valley
	Babic, Nevio; Stiperski, Ivana; Marinovic, Ivana; Vecenaj, Zeljko; De Wekker, Stephan F. J.
通讯作者	Babic, N (corresponding author), Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Hermann von Helmholtzpl 1, D-76344 Eggenstein Leopoldshafen, Germany.
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
ISSN	0168-1923
EISSN	1873-2240
出版年	2021
卷号	298
英文摘要	A surface energy budget underclosure, equivalent to an undersampling of sensible and latent heat fluxes at the surface, is commonly observed in the daytime convective boundary layer over land. The two mechanisms currently held responsible for such underclosure are, on one hand, entrainment-induced reduction of heat fluxes due to low-frequency circulations spanning the depth of the convective boundary layer, and on the other hand, horizontal advection effects induced by surface horizontal heterogeneity. Given the involvement of both heat fluxes in the budget equation, it is expected that the turbulent perturbations of variables involved in these fluxes (potential temperature theta' and specific humidity q') contain the signature of both mechanisms. Here, we assess to what extent non-local entrainment effects contribute to the budget underclosure in complex terrain using a quadrant analysis and multiresolution flux decomposition approach. We use data collected in the semi-arid Owens Valley, CA, USA, during the Terrain-Induced Rotor Experiment (T-REX) campaign. The budget components are sampled near the surface of the valley floor and the adjacent slope, with turbulence flux measurements, pyranometers, pyrgeometers, as well as ground heat flux measurements. We found that the budget underclosure was within the range of underclosures reported in past studies, with a systematically poorer closure over the valley slope. Although quadrant analysis revealed a dominance of scalar-similar events, associated with convective boundary layer overturning, a high degree of disagreement was found between the scalar-dissimilar quadrants which represent the counter-gradient motions. Specifically, those turbulent motions associated with entrainment of free tropospheric air to the surface, were found to be of minor importance in degrading scalar similarity. Instead, we postulate that local horizontal advection and hectometre-scale land-use heterogeneity in the vicinity of both the valley floor and slope sites, are the major factors in controlling the relationship between the budget underclosure and scalar similarity.
英文关键词	surface energy budget scalar similarity convective boundary layer quadrant analysis complex terrain land-use heterogeneity
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000610797100003
WOS关键词	BOUNDARY-LAYER ENTRAINMENT ; COMPLEX TERRAIN ; WATER-VAPOR ; FLUX MEASUREMENTS ; SONIC ANEMOMETER ; CARBON-DIOXIDE ; PART I ; CLOSURE ; HEAT ; TEMPERATURE
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347619
作者单位	[Babic, Nevio] Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Hermann von Helmholtzpl 1, D-76344 Eggenstein Leopoldshafen, Germany; [Stiperski, Ivana] Univ Innsbruck, Dept Atmospher & Cryospher Sci, Innsbruck, Austria; [Marinovic, Ivana] Croatian Meteorol & Hydrol Serv, Zagreb, Croatia; [Vecenaj, Zeljko] Univ Zagreb, Fac Sci, Dept Geophys, Zagreb, Croatia; [Babic, Nevio; De Wekker, Stephan F. J.] Univ Virginia, Dept Environm Sci, Charlottesville, VA USA
推荐引用方式 GB/T 7714	Babic, Nevio,Stiperski, Ivana,Marinovic, Ivana,et al. Examining relationships between entrainment-driven scalar dissimilarity and surface energy balance underclosure in a semiarid valley[J],2021,298.
APA	Babic, Nevio,Stiperski, Ivana,Marinovic, Ivana,Vecenaj, Zeljko,&De Wekker, Stephan F. J..(2021).Examining relationships between entrainment-driven scalar dissimilarity and surface energy balance underclosure in a semiarid valley.AGRICULTURAL AND FOREST METEOROLOGY,298.
MLA	Babic, Nevio,et al."Examining relationships between entrainment-driven scalar dissimilarity and surface energy balance underclosure in a semiarid valley".AGRICULTURAL AND FOREST METEOROLOGY 298(2021).