气候变化领域集成服务门户(CCPortal): The long-term trend and production sensitivity change in the US ozone pollution from observations and model simulations

CCPortal

DOI	10.5194/acp-20-3191-2020
	The long-term trend and production sensitivity change in the US ozone pollution from observations and model simulations
	He H.; Liang X.-Z.; Sun C.; Tao Z.; Tong D.Q.
发表日期	2020
ISSN	1680-7316
起始页码	3191
结束页码	3208
卷号	20 期号:5
英文摘要	We investigated the ozone pollution trend and its sensitivity to key precursors from 1990 to 2015 in the United States using long-term EPA Air Quality System (AQS) observations and mesoscale simulations. The modeling system, a coupled regional climate-air quality model (CWRFCMAQ; Climate-Weather Research Forecast and the Community Multiscale Air Quality), captured well the summer surface ozone pollution during the past decades, having a mean slope of linear regression with AQS observations of ~ 0.75. While the AQS network has limited spatial coverage and measures only a few key chemical species, CWRF-CMAQ provides comprehensive simulations to enable a more rigorous study of the change in ozone pollution and chemical sensitivity. Analysis of seasonal variations and diurnal cycle of ozone observations showed that peak ozone concentrations in the summer afternoon decreased ubiquitously across the United States, up to 0.5 ppbv yr-1 in major non-attainment areas such as Los Angeles, while concentrations at certain hours such as the early morning and late afternoon increased slightly. Consistent with the AQS observations, CMAQ simulated a similar decreasing trend of peak ozone concentrations in the afternoon, up to 0.4 ppbv yr-1, and increasing ozone trends in the early morning and late afternoon. A monotonically decreasing trend (up to 0.5 ppbv yr-1) in the odd oxygen (Ox=O3+NO2) concentrations are simulated by CMAQ at all daytime hours. This result suggests that the increased ozone in the early morning and late afternoon was likely caused by reduced NO-O3 titration, driven by continuous anthropogenic NOx emission reductions in the past decades. Furthermore, the CMAQ simulations revealed a shift in chemical regimes of ozone photochemical production. From 1990 to 2015, surface ozone production in some metropolitan areas, such as Baltimore, has transited from a VOC-sensitive environment (> 50 % probability) to a NOx-sensitive regime. Our results demonstrated that the long-term CWRF-CMAQ simulations can provide detailed information of the ozone chemistry evolution under a changing climate and may partially explain the US ozone pollution responses to regional and national regulations. © Author(s) 2020.
语种	英语
scopus关键词	air quality; atmospheric pollution; computer simulation; mesoscale meteorology; numerical model; ozone; regional climate; summer; trend analysis; 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/141475
作者单位	Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD 20742, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740, United States; Universities Space Research Association, Columbia, MD 21046, United States; NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States; Center for Spatial Information Science and Systems, George Mason University, Fairfax, VA 22030, United States
推荐引用方式 GB/T 7714	He H.,Liang X.-Z.,Sun C.,et al. The long-term trend and production sensitivity change in the US ozone pollution from observations and model simulations[J],2020,20(5).
APA	He H.,Liang X.-Z.,Sun C.,Tao Z.,&Tong D.Q..(2020).The long-term trend and production sensitivity change in the US ozone pollution from observations and model simulations.Atmospheric Chemistry and Physics,20(5).
MLA	He H.,et al."The long-term trend and production sensitivity change in the US ozone pollution from observations and model simulations".Atmospheric Chemistry and Physics 20.5(2020).