沈阳市全运会期间空气质量特征分析

根据沈阳市27个大气污染工业源排放浓度资料,利用MM5耦合CALPUFF对2012年8月至9月沈阳市区气象场和工业源排放浓度分布进行日平均数值模拟。结果表明,2012年8—9月沈阳市主要风向以西南西北为主。通过分析奥体中心处8月2日至9月30日的日均浓度模拟贡献值,可以看出在8月25日、9月7日、9月15日出现高浓度贡献值,分别为3.08,2.64,2.61μg/m3。奥体中心浓度出现高值时呈现出小频率风向即东风和北风,且风速较小;湿度较大,达到75%以上,此条件下影响污染物的传输与扩散。

Using MM5 coupled CALPUFF, the daily average numerical value are simulated for Shenyang urban meteorological field and industrial resource emission concentration distribution in August-September of year 2012, based on the air pollution emission concentration data of 27 industrial sources. The results show that the main wind direction is southwest and northwest from August 2012 to September in Shenyang. Through analysis on August 2nd to September 30, the daily average concentration of simulated contribution value in the Olympic center, the high concentration contribution value appeared on August 25 （ 3.08 μg/m3 ）, September 7 （ 2.64 μg/m3 ）and September 15 （ 2.61 μg/m3）.When high value appeared, there present a sign of small wind direction frequency namely east and north wind, and the wind speed is small;humidity is bigger, more than 75%;the above conditions affect transmission and diffusion of pollutants.