气候变化领域集成服务门户(CCPortal): Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China

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DOI	10.5194/acp-20-203-2020
	Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China
	Han H.; Liu J.; Shu L.; Wang T.; Yuan H.
发表日期	2020
ISSN	16807316
起始页码	203
结束页码	222
卷号	20 期号:1
英文摘要	Ozone pollution in China is influenced by meteorological processes on multiple scales. Using regression analysis and weather classification, we statistically assess the impacts of local and synoptic meteorology on daily variability in surface ozone in eastern China in summer during 2013-2018. In this period, summertime surface ozone in eastern China (20-42ĝ' N, 110-130ĝ' E) is among the highest in the world, with regional means of 73.1 and 114.7 μg m-3, respectively, in daily mean and daily maximum 8 h average. Through developing a multiple linear regression (MLR) model driven by local and synoptic weather factors, we establish a quantitative linkage between the daily mean ozone concentrations and meteorology in the study region. The meteorology described by the MLR can explain ĝ'1/443 % of the daily variability in summertime surface ozone across eastern China. Among local meteorological factors, relative humidity is the most influential variable in the center and south of eastern China, including the Yangtze River Delta and the Pearl River Delta regions, while temperature is the most influential variable in the north, covering the Beijing-Tianjin-Hebei region. To further examine the synoptic influence of weather conditions explicitly, six predominant synoptic weather patterns (SWPs) over eastern China in summer are objectively identified using the self-organizing map clustering technique. The six SWPs are formed under the integral influence of the East Asian summer monsoon, the western Pacific subtropical high, the Meiyu front, and the typhoon activities. On average, regionally, two SWPs bring about positive ozone anomalies (1.1 μg m-3 or 1.7 % and 2.7 μg m-3 or 4.6 %), when eastern China is under a weak cyclone system or under the prevailing southerly wind. The impact of SWPs on the daily variability in surface ozone varies largely within eastern China. The maximum impact can reach ±8 μg m-3 or ±16 % of the daily mean in some areas. A combination of the regression and the clustering approaches suggests a strong performance of the MLR in predicting the sensitivity of surface ozone in eastern China to the variation of synoptic weather. Our assessment highlights the importance of meteorology in modulating ozone pollution over China. © 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
关键词	air quality atmospheric pollution concentration (composition)numerical model ozone regression analysis sensitivity analysis summer synoptic meteorology China Guangdong Yangtze River Zhujiang Delta
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132315
推荐引用方式 GB/T 7714	Han H.,Liu J.,Shu L.,et al. Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China[J]. Atmospheric Chemistry and Physics,2020,20(1).
APA	Han H.,Liu J.,Shu L.,Wang T.,&Yuan H..(2020).Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China.,20(1).
MLA	Han H.,et al."Local and synoptic meteorological influences on daily variability in summertime surface ozone in eastern China".20.1(2020).