为了分析由SO2排放造成的大气污染分布, 利用Models-3/CMAQ模式模拟了成渝经济区（四川）2009年1, 4, 7和10月SO2排放造成的大气污染。结果表明， 模拟值与实测日平均值的相关性较好， 相关系数为0.445； 模拟的SO2空间分布特征与已有监测数据较为一致， 高值区呈三大片区分布， 分别为内江、 自贡、 泸州和宜宾片区, 德阳、 成都、 眉山片区和广安、 达州片区； 各地市模拟值小于监测值, 年均浓度平均值最大的为内江市, 浓度值为13.4 μg·m-3; 年均浓度平均值最小的为绵阳市, 浓度值为1.76 μg·m-3\.SO2浓度季节变化依次为冬季>秋季>春季>夏季, 冬季SO2浓度值最大， 夏季SO2浓度值最小。泸州、 内江始终为SO2浓度高值区， 最大值出现在眉山。
In order to analyze the distribution of atmospheric pollution which is caused by the emissions of SO2，using the third models of Community Multiscale Air Quality model, the emission of SO2 in the Chengdu-Chongqing Economic Area in April, July, and October of 2009 was numerically simulated, and the spatial-temporal distribution and change trends, at the same time, briefly analyzed the causes of the SO2. The result shows that the correlation coefficient between daily simulation and observation of SO2 is 0.445, high SO2 concentration values appear in the three areas, i.e., Neijiang-Zigong-Luzhou-Yibin area, Deyang-Chengdu-Meishan area and Guang′an-Dazhou area. The simulation value is less than the monitoring value around all the cities, the maximum value of the simulated average annual concentration of SO2 appearsin Neijiang city, it is 13.4 μg·m-3, and the minimum value of one appears in Mianyang, it is 1.76 μg·m-3. The change discipline of the seasonal concentration of SO2 is winter>autumn>spring>summer, respectively. The maximum value of SO2 concentration occurs in winter whereas the minimum value occurs in summer. The maximum area of SO2 concentration always appears in Luzhou and Neijiang, the maximum value appears in Meishan.
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