气候变化领域集成服务门户(CCPortal): Nocturnal boundary layer turbulence regimes analysis during the BLLAST campaign

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DOI	10.5194/acp-19-9495-2019
	Nocturnal boundary layer turbulence regimes analysis during the BLLAST campaign
	Yus-Díez J.; Udina M.; Soler M.R.; Lothon M.; Nilsson E.; Bech J.; Sun J.
发表日期	2019
ISSN	16807316
起始页码	9495
结束页码	9514
卷号	19 期号:14
英文摘要	A night-time turbulence regime classification, the so-called "HOckey-Stick Transition " (HOST) theory, proposed by Sun et al. (2012) from the Cooperative Atmosphere-Surface Exchange Study-1999 (CASES-99) is explored using data from the Boundary-Layer Late Afternoon and Sunset Turbulence (BLLAST) field campaign which took place during summer 2011 in the central French Pyrenean foothills. Results show that the HOST turbulence relationships for the BLLAST field campaign data are strongly dependent on both the meteorological and orographic features. The HOST pattern only appears for nights when a stably stratified boundary layer can be developed, corresponding to fair-weather and clear-sky nights, when the flow is generated by the nearby orography, from the south and the south-east. Those flows strongly influenced by the orography may generate intermittent or enhanced turbulence. When considering the whole nocturnal dataset for these flow directions, several enhanced turbulence points are found to be associated with sudden wind speed and directional shear transitions. In contrast, flows from other directions do not reproduce the HOST relationships and the turbulence relationship is almost linear, independent of vertical temperature gradients, corresponding to flows driven by synoptic scales. In addition we identify examples of gravity waves and top-down turbulent events that lead to transitions between the turbulence regimes. © 2019 Author(s).
语种	英语
scopus关键词	air temperature; atmospheric wave; gravity wave; orography; temperature gradient; turbulence; turbulent boundary layer
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144253
作者单位	Departament de Física Aplicada - Meteorologia, Universitat de Barcelona, C/Martí i Franquès, 1, Barcelona, 08028, Spain; Laboratoire d'Aérologie, University of Toulouse, CNRS, France; Department of Earth Sciences, Uppsala University, Uppsala, Sweden; NorthWest Research Associ., Boulder, CO, United States; Institute of Environmental Assessment and Water Research (IDAEA-CSIC), C/Jordi Girona 18-26, Barcelona, 08034, Spain
推荐引用方式 GB/T 7714	Yus-Díez J.,Udina M.,Soler M.R.,et al. Nocturnal boundary layer turbulence regimes analysis during the BLLAST campaign[J],2019,19(14).
APA	Yus-Díez J..,Udina M..,Soler M.R..,Lothon M..,Nilsson E..,...&Sun J..(2019).Nocturnal boundary layer turbulence regimes analysis during the BLLAST campaign.Atmospheric Chemistry and Physics,19(14).
MLA	Yus-Díez J.,et al."Nocturnal boundary layer turbulence regimes analysis during the BLLAST campaign".Atmospheric Chemistry and Physics 19.14(2019).