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选用美国国家环保局第3代空气质量模式(Models-3/CMAQ),配合中尺度气象模式(MM5)进行研究,模拟了2001年1、7月份长江三角洲区域冬夏季典型天气条件下大气层二次污染物臭氧及颗粒物的浓度分布及输送状况。采用2001年冬、夏季各10d的小时监测数据对模式验证。结果表明,Models-3/CMAQ对O_3、PM_(10)的模拟相关系数分别为0.77和0.52;一致性指数分别达到0.81和0.99。模型对于O_3略微低估.标准偏差为3.1%,而对于PM_(10)则有所高估,标准偏差为46%。对长三角7月份O_3浓度及1月份PM_(10)的模拟结果显示,7月份长三角区域16个主要城市O_3日均浓度集中在0.043～0.086mg/m~3之间.其中,泰州、扬州、湖州、镇江O_3月日均浓度相对较高,均超过0.064mg/m~3。模拟时段内O_3最高小时浓度达0.276mg/m~3。1月份整个模拟区域PM_(10)月日均浓度为0.056mg/m~3,其中,南京市PM_(10)日均浓度最高,达0.080mg/m~3。模拟时段内PM_(10)最高小时浓度达0.432mg/m~3。研究表明,长三角地区存在明显的污染物输送现象,大气污染已经从局地污染转化为区域污染。
The Models 3 / CMAQ and Models 5 and 5 of the National Environmental Protection Agency (EPA) were used to study the meteorological patterns (MM5) of the Meso-Meteorological Observatory. The air quality was simulated under the typical winter and summer weather conditions of the Yangtze River Delta in January and July 2001 Pollutants Ozone and particulate matter concentration distribution and delivery status. Using winter and summer of 2001 10d hour monitoring data to verify the model. The results showed that the correlation coefficients of Models-3 / CMAQ for O_3 and PM_ (10) were 0.77 and 0.52 respectively, and the consistency indices were 0.81 and 0.99 respectively. The model is slightly underestimated for O 3 with a standard deviation of 3.1% and an overestimation of PM 10 with a standard deviation of 46%. The simulation results of O_3 concentration in July and PM_ (10) in January in the Yangtze River Delta showed that the average concentration of O_3 in 16 major cities in the Yangtze River Delta was 0.043 ~ 0.086mg / m ~ 3 in July, of which, Taizhou and Yangzhou , Huzhou, Zhenjiang O_3 daily average concentration of the higher, all over 0.064mg / m ~ 3. The maximum hourly concentration of O_3 in the simulation period was 0.276mg / m ~ 3. The average daily PM_ (10) concentration in the entire simulated area in January was 0.056mg / m ~ 3, of which the daily average concentration of PM_ (10) in Nanjing was the highest 0.080mg / m ~ 3. The maximum hourly concentration of PM_ (10) reached 0.432mg / m ~ 3 during the simulation period. Research shows that there is a clear phenomenon of pollutant transport in the Yangtze River Delta. Air pollution has been transformed from local pollution to regional pollution.