Variations in summertime ozone in Nanjing between 2015 and 2020:roles of meteorology,radical chain length and ozone production efficiency  

作　　者：Lin Li Jingyi Li Momei Qin Xiaodong Xie Jianlin Hu Yuqiang Zhang 

机构地区：[1]Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control,Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Nanjing University of Information Science&Technology,Nanjing 210044,China [2]Environment Research Institute,Shandong University,Qingdao 266237,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第11期85-96,共12页环境科学与工程前沿（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.42277095,42021004).

摘　　要：Changes in ozone(O_(3))can be evaluated to inform policy effectiveness and develop reasonable emissions reduction measures.This study investigated the causes of summertime maximum daily 8-h average(MDA8)O_(3) variation between 2015 and 2020 in Nanjing,China,a megacity in the Yangtze River Delta(YRD)region,from the perspective of meteorological conditions and anthropogenic emissions of O_(3) precursors(VOCs and NO_(x)).Compared with 2015,the observed MDA8 O_(3) decreased by 19.1μg/m^(3) in August 2020.The indirect and indirect impacts of meteorological conditions contributed 44%of the decline,with temperature,relative humidity,and wind playing important roles in the O_(3) variation.The O_(3) drop by 10.7μg/m^(3)(56%of the total decrease)may have been due to the decreases in anthropogenic emissions of VOCs and NO_(x) by 7.8%and 11.7%,respectively.The longer hydroxyl(OH)radical chain length and higher ozone production efficiency(OPE)indicated that the reduction of anthropogenic emissions accelerated the RO_(x)(RO_(x)=OH+HO_(2)+RO_(2))and NO_(x) cycles in O_(3) production,making O_(3) more sensitive to NO_(x).This corresponded to the O_(3) formation shifting from a VOC-limited regime in 2015 to a transition regime in 2020 and O_(3) decrease with anthropogenic emission reduction.Hence,the joint control of O_(3) precursor emissions can effectively mitigate O_(3) pollution in Nanjing.

关 键 词：OZONE Meteorological condition Anthropogenic emission OH radical chain length OPE 

分 类 号：X515[环境科学与工程—环境工程]