2015年常熟市灰霾天氣特征分析
發(fā)布時(shí)間：2018-09-19 16:28
【摘要】：利用常熟大氣環(huán)境監(jiān)測站的PM_(2.5)和PM_(10)大氣污染物觀測資料和常熟本站自動(dòng)氣象觀測數(shù)據(jù),分析2015年常熟地區(qū)PM_(2.5)和PM_(10)的時(shí)空分布特征,探討氣象條件對霾日影響。結(jié)果表明:(1)2015年常熟市霾日162 d,冬季總霾日數(shù)出現(xiàn)最多,其次是春季,夏季最少。(2)數(shù)據(jù)顯示,PM_(2.5)的超標(biāo)日數(shù)遠(yuǎn)大于PM_(10)的超標(biāo)日數(shù),2015年常熟PM_(2.5)的超標(biāo)日數(shù)為78 d,PM_(10)的超標(biāo)日數(shù)為9 d,研究發(fā)現(xiàn)霾日和PM_(2.5)的超標(biāo)日數(shù)更為密切,細(xì)粒子的超標(biāo)對霾天氣的發(fā)生貢獻(xiàn)更大;一年中,常熟地區(qū)冬季PM_(2.5)和PM_(10)的濃度最高,分別達(dá)83.79μg/m~3和88.06μg/m~3,其次是春秋季,夏季明顯偏小;在沒有天氣系統(tǒng)影響下,PM_(2.5)和PM_(10)濃度的日變化規(guī)律一般表現(xiàn)出雙峰型特征。(3)風(fēng)速、相對濕度和降水氣象條件對霾天氣的發(fā)生有顯著影響,風(fēng)有較好的稀釋擴(kuò)散效應(yīng),降水天氣一般對霾有較好的稀釋擴(kuò)散效應(yīng),相對濕度在70%~80%之間,霾天氣發(fā)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.
【作者單位】： 常熟市氣象局;
【分類號】：X513
，
本文編號：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.
【作者單位】： 常熟市氣象局;
【分類號】：X513
，
本文編號：2250686
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