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DOI	10.1016/j.atmosres.2019.01.019
	Comparing mountain breezes and their impacts on CO 2 mixing ratios at three contrasting areas
	Román-Cascón C.; Yagüe C.; Arrillaga J.A.; Lothon M.; Pardyjak E.R.; Lohou F.; Inclán R.M.; Sastre M.; Maqueda G.; Derrien S.; Meyerfeld Y.; Hang C.; Campargue-Rodríguez P.; Turki I.
发表日期	2019
ISSN	0169-8095
起始页码	111
结束页码	126
卷号	221
英文摘要	This work presents the characterisation and comparison of daytime and nighttime mountain breezes observed at three sites through the analysis of tower data. The sites are located: (i) in the foothills of the Guadarrama Mountains in Spain, (ii) on a plateau adjacent to the Pyrenees in France, and (iii) in the Salt Lake Valley (SLV) in the southwest of the United States. The thermally-driven winds are detected through a systematic algorithm which considers both synoptic and local meteorological conditions. The characteristics of the mountain breezes depend on the scale of the breeze at each site. Nighttime events are associated with stronger wind speeds at the two sites located farther away from the mountains due to larger-scale phenomena (valley winds and mountain-plain winds). The arrival of both nighttime and daytime flows to the sites are observed approximately when the buoyancy heat flux changes sign, being a few hours delayed at the sites farther from the mountains. In addition, the impacts of these breezes on CO 2 mixing ratios are analysed. The characteristic increase of CO 2 mixing ratio observed during the evening transition takes place approximately when the nocturnal breeze arrives at the site. Nonetheless, both processes are not always simultaneous, indicating that CO 2 advection is not the main mechanism controlling the drastic CO 2 increase. An analogous result is obtained for the CO 2 decrease at the morning transition. However, we have found that the CO 2 mixing ratio is sensitive to wind direction (horizontal advection) in highly heterogeneous areas like the SLV, where CO 2 emissions from the nearby city centre play an important role. Finally, a clear relationship is found between the CO 2 mixing ratio and near-surface turbulence at night. Maximum CO 2 mixing ratios are found for specific turbulence thresholds, which depend on the height of the CO 2 sensor. Conditions associated with both stronger and weaker turbulence levels lead to reduced CO 2 mixing ratios at the local measurement height due to excessive and ineffective mixing, respectively. © 2019 The Authors
英文关键词	Advection; CO 2; Downslope; Thermally-driven flows; Turbulent mixing; Upslope
语种	英语
scopus关键词	Advection; Heat flux; Landforms; Mixing; Turbulence; Wind; Downslope; Horizontal advection; Local measurement; Meteorological condition; Salt Lake Valley; Thermally driven; Turbulent mixing; Upslope; Carbon dioxide; advection; carbon dioxide; comparative study; land breeze; mixing ratio; turbulence; turbulent mixing; wind direction; wind velocity; France; Pyrenees; Salt Lake Valley; Sierra de Guadarrama; Sistema Central; Spain; United States; Utah
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162206
作者单位	Departamento de Física de la Tierra y Astrofísica, Universidad Complutense de Madrid, Spain; Laboratoire d'Aérologie, Université Toulouse Paul Sabatier, CNRS, France; Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, United States; Department of Environment, CIEMAT, Madrid, Spain; Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia
推荐引用方式 GB/T 7714	Román-Cascón C.,Yagüe C.,Arrillaga J.A.,et al. Comparing mountain breezes and their impacts on CO 2 mixing ratios at three contrasting areas[J],2019,221.
APA	Román-Cascón C..,Yagüe C..,Arrillaga J.A..,Lothon M..,Pardyjak E.R..,...&Turki I..(2019).Comparing mountain breezes and their impacts on CO 2 mixing ratios at three contrasting areas.Atmospheric Research,221.
MLA	Román-Cascón C.,et al."Comparing mountain breezes and their impacts on CO 2 mixing ratios at three contrasting areas".Atmospheric Research 221(2019).