2016—2019年长沙市O3浓度变化特征及其影响因子分析

doi:10.3969/j.issn.1673-503X.2023.02.006

Abstract

Abstract:

Based on the hourly monitoring data of ozone, NO₂, and CO in Changsha from 2016 to 2019 and the corresponding meteorological observation data, the temporal and spatial variations of ozone concentration and the meteorological influence factors were analyzed.The results show that the annual mean maximum 8-h moving average concentration of ozone in Changsha during 2016 and 2019 were (52.81±26.61) μg·m^-3, (55.89±25.42) μg·m^-3, (61.74±29.56) μg·m^-3 and (60.77±31.68) μg·m^-3, respectively, with an increasing trend.Ozone level is the highest in summer (mean 74.56 μg·m^-3) and the lowest in winter (mean 33.64 μg·m^-3).The diurnal variation in ozone presents a significant single-peak pattern with the peak level appearing at around 16:00 and the exceeding standard period between 12:00 and 18:00.The spatial heterogeneity in ozone shows that the levels appear larger at the urban periphery than at the urban center sites, with the largest heterogeneity in winter (0.12) and the smallest heterogeneity in summer (0.04).The concentrations of ozone in Changsha are positively correlated with temperature and solar radiation with the coefficients of 0.61 and 0.65, respectively, and negatively correlated with relative humidity, NO₂, and CO with coefficients of -0.42, -0.35, and -0.27, respectively.

Key words: Ozone level, Meteorological factors, Generalized additive models

CLC Number:

X515

Rui-yang HUA,Wei LI,Cheng-zhi YE,Chang-jian NI. Variations of ozone concentration and its influence factors in Changsha from 2016 to 2019[J]. Journal of Meteorology and Environment, 2023, 39(2): 44-52.

Figures/Tables 14

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References 26

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年份	春季	夏季	秋季	冬季
2016年	56.30	68.58	51.93	34.22
2017年	64.53	64.98	57.22	36.42
2018年	66.87	82.66	61.43	34.71
2019年	58.58	82.02	72.00	29.22
平均值	61.57	74.56	60.65	33.64

年份	2016年	2017年	2018年	2019年
周末平均浓度	55.44	55.71	64.17	60.06
工作日平均浓度	52.82	55.96	60.76	61.05
浓度差	2.62	-0.25	3.14	-0.99

年份	超标日数/d	超标平均浓度/(μg·m^-3)	超标率/(%)	与标准限值浓度差/(μg·m^-3)
2016年	24	176.99	6.6	16.99
2017年	28	178.93	7.7	18.93
2018年	28	179.87	7.7	19.87
2019年	48	177.53	13.2	17.53
合计	128	178.33	8.8	18.33

变量	O₃浓度	NO₂浓度	CO浓度	温度	总辐射	相对湿度	气压	风速
O₃浓度	1.00	-0.27	-0.35	0.61	0.65	-0.420	-0.44	-0.08
NO₂浓度	—	1.00	0.38	-0.11	-0.03	-0.390	0.44	-0.36
CO浓度	—	—	1.00	-0.09	-0.04	0.016	0.29	-0.15
温度	—	—	—	1.00	0.64	-0.160	-0.80	-0.22
总辐射	—	—	—	—	1.00	-0.650	-0.41	-0.32
相对湿度	—	—	—	—	—	1.000	-0.09	0.18
气压	—	—	—	—	—	—	1.00	0.16
风速	—	—	—	—	—	—	—	1.00

平滑效应项	估计自由度	参考自由度	F	P	R²	方差解释率/(%)
太阳辐射	4.948	6.040	420.70	<2e-16^*	0.6570	65.9
相对湿度	6.134	7.302	115.00	<2e-16^*	0.3870	39.0
气温	8.433	8.911	106.90	<2e-16^*	0.4180	42.1
风速	1.704	2.155	51.26	<2e-16^*	0.0764	7.8
气压	4.859	5.837	59.51	<2e-16^*	0.2070	21.0

Variations of ozone concentration and its influence factors in Changsha from 2016 to 2019

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平滑效应项	估计自由度	参考自由度	F	P
太阳辐射	3.968	4.934	75.449	<2e^-16*
相对湿度	6.823	7.931	12.729	<2e^-16*
气温	7.747	8.593	25.188	<2e^-16*
风速	4.978	6.124	6.681	4.61e^-07*
气压	7.450	8.373	3.159	0.00124^**

平滑效应项	估计自由度	参考自由度	F	P
太阳辐射	4.099	5.080	74.81	<2e^-16*
相对湿度	6.948	8.035	15.90	<2e^-16*
气温	8.025	8.751	47.12	<2e^-16*