2017—2019年太原南部城区夏季O3特征及其影响因子

doi:10.3969/j.issn.1673-503X.2021.03.006

Abstract

Abstract:

Based on the hourly data of pollutant concentration and relative meteorological factors during summer (June to August) from 2017-2019, the distribution characteristics of O₃ concentration and its influencing factors in Taiyuan were analyzed using the neural network method.The results show that, during the summer from 2017-2019, the numbers of days in which the O₃ concentration exceeds the limit in Taiyuan are 55 d, 39 d, 59 d, respectively.The cases that the O₃ concentration exceeds the limit mostly occur in June and July.The diurnal variation of O₃ concentration is unimodal, with the lowest around 06:00, and the peak around 15:00.The conditions such as high temperature, strong radiation, low humidity, low pressure, and southwest wind can easily lead to an increase of O₃ concentration in Taiyuan urban areas.The NW wind is beneficial to the diffusion of O₃ concentration.The relationships of NO₂ and CO with O₃ concentration are negative, and the influence of NO₂ is more significant.The selected cases show that the O₃ concentration fluctuates with the influencing factors.The relationship between O₃ concentration and the influencing factors is constructed using the neural network method, with the correlation coefficient of 0.96, the mean square root and average absolute error of 8 μg·m^-3 and 6%, respectively, and TS score of 0.95.The neural network model is valuable for the O₃ concentration prediction and ozone pollution control in the Taiyuan area.

Key words: O₃ concentration, Meteorological factors, Neural network

CLC Number:

X515
X16

Sheng-dong LU, Jun-xia LI, Fen LI, Jun-jie ZHAO, Ze-hui JIN, Ying LI, Xiao LIU. Analysis of the characteristics of O₃ concentration and its influencing factors in summer from 2017 to 2019 in the southern urban area of Taiyuan[J]. Journal of Meteorology and Environment, 2021, 37(3): 40-46.

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References 27

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年份	6月	7月	8月
2017年	176.67	182.52	139.52
2018年	165.63	141.71	133.55
2019年	181.7	176.39	131.65

气温/℃	频率/(%)	O₃超标率/(%)	O₃平均浓度/(μg·m^-3)	相关系数
T≤20	23.74	0.48	46	0.75
20＜T≤30	62.33	15.43	105	0.77
30＜T≤35	13.23	73.81	194	0.34
T＞35	0.8	96	217	-0.01

相对湿度/(%)	频率/(%)	O₃超标率/(%)	O₃平均浓度/(μg·m^-3)	相关系数
RH≤40	17.99	55.09	168	-0.04
40＜RH≤60	25.41	34.57	136	-0.203
60＜RH≤80	27.23	5.30	90	-0.24
80＜RH≤90	12.17	0.98	61	-0.116
RH＞90	16.2	0	38	-0.32

要素	前1 h	实时	后1 h
O₃平均浓度(μg·m^-3)	81	76	72

气压/hPa	频率/(%)	O₃超标率/(%)	O₃平均浓度/(μg·m^-3)	相关系数
P≤910	0.13	75	187	-0.29
910＜P≤920	53.01	29.98	119	-0.21
920＜P≤930	46.34	9.23	86	-0.27
P＞930	0.53	0	42	-0.15

Analysis of the characteristics of O₃ concentration and its influencing factors in summer from 2017 to 2019 in the southern urban area of Taiyuan

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要素	前2 h	前1 h	实时
NO₂	-0.56	-0.65	-0.71
CO	-0.06	-0.14	-0.22

时段	气温/℃	相对湿度/(%)	气压/hPa	风速/(m·s^-1)	太阳辐射/(MJ·m^-2)	NO₂/(μg·m^-3)	CO/(μg·m^-3)
前2 h	29.5	43	918.46	2.1	2.38	22	0.79
前1 h	29.7	42	918.1	2.2	2.17	19	0.76
污染时段	31.0	40	917.7	2.2	1.84	18	0.74
后1 h	29.5	43	917.83	2.1	1.48	20	0.79
后2 h	28.8	46	918.83	2.0	1.11	24	0.81

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Analysis of the characteristics of O3 concentration and its influencing factors in summer from 2017 to 2019 in the southern urban area of Taiyuan

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Analysis of the characteristics of O₃ concentration and its influencing factors in summer from 2017 to 2019 in the southern urban area of Taiyuan