成都O<sub>3</sub>逐日污染潜势关键时段优选的GAM模型

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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(O_3-8h) 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 O_3-8h 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 O_3-8 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.

Key words： ozone daily pollution potential key period Generalized Additive Model Chengdu

Received: 08 March 2021

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X515

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	Articles by authors
	REN Zhi-han
	NI Chang-jian
	HUA Rui-yang
	DU Yun-song

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REN Zhi-han,NI Chang-jian,HUA Rui-yang等. Optimization of the key period of daily ozone pollution potential in Chengdu based on Generalized Additive Model[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5079-5085.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5079

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