沈阳市环境空气中PM_(2.5)扩散时空模拟研究

利用2017年沈阳市的PM_(2.5)数据资料,分析颗粒物的月变化、小时变化特征,并利用HYSPLIT模型结合Google Earth对颗粒物立体扩散进行模拟。结果显示:月浓度表现为夏高冬低的特征,日浓度中出现2个浓度峰值,分别是08:00和23:00左右;1月3—9日期间沈阳市出现了持续时间较长的重度污染及严重污染天气,在此期间污染物的浓度升高快速,并且有速消散的特征;三维模拟结果显示,PM_(2.5)扩散影响区域涉及渤海和东海海域、吉林省、黑龙江省、山东省、安徽省等地;四维模拟结果显示,在0~1500 m高度层的PM_(2.5)粒子扩散影响区域为山东省、河南省、安徽省、湖北省、江苏省、浙江省等地;在1500~3000 m高度层由沈阳向南扩散。

Based on the data of PM_(2.5)in Shenyang in 2017,characteristics of the monthly concentration and hourly concentration were analyzed,and diffusion of particulate matter was simulated by HYSPLIT model and Google Earth.The results showed that the monthly concentration was characterized by"high in summer and low in winter",and there were two peaks in the daily concentration,which were around 8 o'clock and 23 o'clock respectively.During the period of January 3-9,there was a long duration of heavy pollution and severe pollution in Shenyang,during which the concentration of pollutants rose rapidly and had the characteristics of rapid dissipation.The three-dimensional simulation showed that the PM_(2.5)diffusion influence area involved the Bohai Sea and the East China Sea,Jilin Province,Heilongjiang Province,Shandong Province,Anhui Province,etc.The four-dimensional simulation showed that the PM_(2.5)particle diffusion influence areas at 0-1500 m height layer were Shandong Province,Henan Province,Anhui Province,Hubei Province,Jiangsu Province,Zhejiang Province,etc.At the height layer of 1500-3000 m,the particle diffusion is from Shenyang to the south.