Optimization of the key period of daily ozone pollution potential in Chengdu based on Generalized Additive Model
REN Zhi-han1,2, NI Chang-jian1,2, HUA Rui-yang1,2, DU Yun-song3
1. School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China; 2. Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu 610225, China; 3. Sichuan Ecological Environment Monitoring Station, Chengdu 610091, China
Abstract:Daily characteristics of O3 were analyzed using hourly observational data of O3 concentration and corresponding meteorological data from 2016 to 2018 in Chengdu. Four key periods featuring daily ozone pollution potential were selected which were all day period (0:00~24:00), daytime period (05:00~20:00), the period of O3 exceeding the standard (11:00~19:00) and the period of O3 reaching its peak (15:00~16:00). The relationship between the maximum 8-hour moving average of O3(O3-8h) and meteorological factors during the four periods were established based on Generalized Additive Model (GAM). The effects of the variation of time scale on daily ozone pollution potential were also investigated. The results showed that GAM model could simulate and capture the non-linear relationship between O3-8h and meteorological factors. Meteorological factors during the period of O3 exceeding the standard (from 11:00 to 19:00) could best represent daily O3 pollution potential with adjusted determination coefficient R2 and interpretation rate of variance of 0.81 and 81.4%, respectively. The determination coefficient R2 of reduced major axis regression (RMA) between simulated O3-8 and observed ones was 0.805. Solar radiation, relative humidity and air temperature, were three main factors affecting daily O3 pollution potential. However, the ranking of the importance varied with time scale in the certain one of the four GAM models.
任至涵, 倪长健, 花瑞阳, 杜云松. 成都O3逐日污染潜势关键时段优选的GAM模型[J]. 中国环境科学, 2021, 41(11): 5079-5085.
REN Zhi-han, NI Chang-jian, HUA Rui-yang, DU Yun-song. Optimization of the key period of daily ozone pollution potential in Chengdu based on Generalized Additive Model. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5079-5085.
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