First long-term surface ozone variations at an agricultural site in the North China Plain: Evolution under changing meteorology and emissions
First long-term surface ozone variations at an agricultural site in the North China Plain: Evolution under changing meteorology and emissions
复制标题
华北平原农业区首次长期地表臭氧变化：气象和排放变化下的演变
DOI：
10.1016/j.scitotenv.2022.160520
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发表时间：
2023
影响因子：
9.8
通讯作者：
Xiaobin Xu
中科院分区：
文献类型：
--
作者：
Xiaoyi Zhang;Wanyun Xu;Gen Zhang;Weili Lin;Huarong Zhao;Sanxue Ren;Guangsheng Zhou;Jianmin Chen;Xiaobin Xu
Significant upward trends in surface ozone (O3) have been widely reported in China during recent years, especially during warm seasons in the North China Plain (NCP), exerting adverse environmental effects on human health and agriculture. Quantifying long-term O3variations and their attributions helps to understand the causes of regional O3pollution and to formulate according control strategy. In this study, we present long-term trends of O3in the warm seasons (April–September) during 2006–2019 at an agricultural site in the NCP and investigate the relative contributions of meteorological and anthropogenic factors. Overall, the maximum daily 8-h average (MDA8) O3exhibited a weak decreasing trend with large interannual variability. < 6 % of the observed trend could be explained by changes in meteorological conditions, while the remaining 94 % was attributed to anthropogenic impacts. However, the interannual variability of warm season MDA8 O3was driven by both meteorology (36 ± 28 %) and anthropogenic factors (64 ± 27 %). Daily maximum temperature was the most essential factor affecting O3variations, followed by ultraviolet radiation b (UVB) and boundary layer height (BLH), with rising temperature trends inducing O3inclines throughout April to August, while UVB mainly influenced O3during summer months. Under changes in emissions and air quality, warm season O3production regime gradually shifted from dominantly VOCs-limited during 2006–2015 to NOx-limited afterwards. Relatively steady HCHO and remarkably rising NOxlevels resulted in the fast decreasing MDA8 O3(−2.87 ppb yr−1) during 2006–2012. Rapidly decreasing NOx, flat or slightly increasing HCHO promoted O3increases during 2012–2015 (9.76 ppb yr−1). While afterwards, slow increases in HCHO and downwards fluctuating NOxled to decreases in MDA8 O3(−4.97 ppb yr−1). Additionally, continuous warming trends might promote natural emissions of O3precursors and magnify their impacts on agricultural O3by inducing high variability, which would require even more anthropogenic reduction to compensate for.
