气候变化领域集成服务门户(CCPortal): The impact of Los Angeles Basin pollution and stratospheric intrusions on the surrounding San Gabriel Mountains as seen by surface measurements, lidar, and numerical models

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DOI	10.5194/acp-21-6129-2021
	The impact of Los Angeles Basin pollution and stratospheric intrusions on the surrounding San Gabriel Mountains as seen by surface measurements, lidar, and numerical models
	Chouza F.; Leblanc T.; Brewer M.; Wang P.; Piazzolla S.; Pfister G.; Kumar R.; Drews C.; Tilmes S.; Emmons L.; Johnson M.
发表日期	2021
ISSN	1680-7316
起始页码	6129
结束页码	6153
卷号	21 期号:8
英文摘要	In this work, the impact of Los Angeles Basin pollution transport and stratospheric intrusions on the surface ozone levels observed in the San Gabriel Mountains is investigated based on a combination of surface and lidar measurements as well as WRF-Chem (Weather Research and Forecasting with Chemistry) and WACCM (Whole Atmosphere Community Climate Model) runs. The number of days with observed surface ozone levels exceeding the National Ambient Air Quality Standards exhibit a clear seasonal pattern, with a maximum during summer, when models suggest a minimum influence of stratospheric intrusions and the largest impact from Los Angeles Basin pollution transport. Additionally, measured and modeled surface ozone and PM10 were analyzed as a function of season, time of the day, and wind direction. Measurements and models are in good qualitative agreement, with maximum surface ozone observed for southwest and west winds. For the prevailing summer wind direction, slightly south of the ozone maximum and corresponding to south-southwest winds, lower ozone levels were observed. Back trajectories suggest that this is associated with transport from the central Los Angeles Basin, where titration limits the amount of surface ozone. A quantitative comparison of the lidar profiles with WRF-Chem and WACCM models revealed good agreement near the surface, with models showing an increasing positive bias as function of altitude, reaching 75% at 15 km above sea level. Finally, three selected case studies covering the different mechanisms affecting the near-surface ozone concentration over the San Gabriel Mountains, namely stratospheric intrusions and pollution transport, are analyzed based on surface and ozone lidar measurements, as well as co-located ceilometer measurements and models. © Author(s) 2021.
语种	英语
scopus关键词	air quality; ambient air; atmospheric pollution; lidar; mountain region; numerical model; ozone; pollutant transport; stratosphere; California; Los Angeles [California]; San Gabriel Mountains; United States
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/246951
作者单位	Laboratory Studies and Atmospheric Observations, Jet Propulsion Laboratory, California Institute of Technology, Wrightwood, CA, United States; Optical Communication Systems, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, United States; Atmospheric Chemistry Observations and Modeling Laboratory, National Center for Atmospheric Research (NCAR), Boulder, CO, United States; Earth Science Division, NASA Ames Research Center, Moffett Field, CA, United States
推荐引用方式 GB/T 7714	Chouza F.,Leblanc T.,Brewer M.,et al. The impact of Los Angeles Basin pollution and stratospheric intrusions on the surrounding San Gabriel Mountains as seen by surface measurements, lidar, and numerical models[J],2021,21(8).
APA	Chouza F..,Leblanc T..,Brewer M..,Wang P..,Piazzolla S..,...&Johnson M..(2021).The impact of Los Angeles Basin pollution and stratospheric intrusions on the surrounding San Gabriel Mountains as seen by surface measurements, lidar, and numerical models.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(8).
MLA	Chouza F.,et al."The impact of Los Angeles Basin pollution and stratospheric intrusions on the surrounding San Gabriel Mountains as seen by surface measurements, lidar, and numerical models".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.8(2021).