2015年常熟市灰霾天气特征分析
发布时间：2018-09-19 16:28
【摘要】：利用常熟大气环境监测站的PM_(2.5)和PM_(10)大气污染物观测资料和常熟本站自动气象观测数据,分析2015年常熟地区PM_(2.5)和PM_(10)的时空分布特征,探讨气象条件对霾日影响。结果表明:(1)2015年常熟市霾日162 d,冬季总霾日数出现最多,其次是春季,夏季最少。(2)数据显示,PM_(2.5)的超标日数远大于PM_(10)的超标日数,2015年常熟PM_(2.5)的超标日数为78 d,PM_(10)的超标日数为9 d,研究发现霾日和PM_(2.5)的超标日数更为密切,细粒子的超标对霾天气的发生贡献更大;一年中,常熟地区冬季PM_(2.5)和PM_(10)的浓度最高,分别达83.79μg/m~3和88.06μg/m~3,其次是春秋季,夏季明显偏小;在没有天气系统影响下,PM_(2.5)和PM_(10)浓度的日变化规律一般表现出双峰型特征。(3)风速、相对湿度和降水气象条件对霾天气的发生有显著影响,风有较好的稀释扩散效应,降水天气一般对霾有较好的稀释扩散效应,相对湿度在70%~80%之间,霾天气发生概率最大。
[Abstract]:Based on the observational data of PM_ (2.5) and PM_ (10) atmospheric pollutants from Changshu atmospheric environment monitoring station and automatic meteorological observation data of Changshu station, the temporal and spatial distribution characteristics of PM_ (2.5) and PM_ (10) in Changshu region in 2015 were analyzed, and the influence of meteorological conditions on the daily haze was discussed. The results are as follows: (1) in 2015, the total haze days in Changshu City appeared the most during the year of 162d, followed by the days in spring. (2) the data showed that the number of excess days of PM2.5 was much larger than that of PM_ (10), and that of Changshu PM_ (2.5) was 78 days in 2015. The study found that the days of haze and PM_ (2.5) were more closely than those of PM_ (2. 5). The concentration of PM_ (2.5) and PM_ (10) in winter in Changshu region was the highest, reaching 83.79 渭 g/m~3 and 88.06 渭 g / m ~ (-1) respectively, followed by spring and autumn and summer. The diurnal variation of PM2.5 and PM_ _ (10) concentrations without the influence of the weather system generally shows a bimodal pattern. (3) the wind speed, relative humidity and precipitation meteorological conditions have significant effects on the occurrence of haze, and the wind has a good dilution and diffusion effect. Precipitation generally has a good dilution diffusion effect on haze, the relative humidity is between 70% and 80%, and the probability of haze occurrence is the highest.
【作者单位】： 常熟市气象局;
【分类号】：X513
，
本文编号：2250686
[Abstract]:Based on the observational data of PM_ (2.5) and PM_ (10) atmospheric pollutants from Changshu atmospheric environment monitoring station and automatic meteorological observation data of Changshu station, the temporal and spatial distribution characteristics of PM_ (2.5) and PM_ (10) in Changshu region in 2015 were analyzed, and the influence of meteorological conditions on the daily haze was discussed. The results are as follows: (1) in 2015, the total haze days in Changshu City appeared the most during the year of 162d, followed by the days in spring. (2) the data showed that the number of excess days of PM2.5 was much larger than that of PM_ (10), and that of Changshu PM_ (2.5) was 78 days in 2015. The study found that the days of haze and PM_ (2.5) were more closely than those of PM_ (2. 5). The concentration of PM_ (2.5) and PM_ (10) in winter in Changshu region was the highest, reaching 83.79 渭 g/m~3 and 88.06 渭 g / m ~ (-1) respectively, followed by spring and autumn and summer. The diurnal variation of PM2.5 and PM_ _ (10) concentrations without the influence of the weather system generally shows a bimodal pattern. (3) the wind speed, relative humidity and precipitation meteorological conditions have significant effects on the occurrence of haze, and the wind has a good dilution and diffusion effect. Precipitation generally has a good dilution diffusion effect on haze, the relative humidity is between 70% and 80%, and the probability of haze occurrence is the highest.
【作者单位】： 常熟市气象局;
【分类号】：X513
，
本文编号：2250686
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