2014年东北三省主要城市大气PM_(2.5)污染时空格局演变及重心偏移

The Research on Changes of Time and Space Pattern and its Pollution Center Movement of PM_(2.5) in Main Cities of North-east Provinces in 2014

利用2014年度东北三省16个主要城市PM2.5浓度数据以及16个城市地理坐标,分析了PM2.5浓度的时空变化特征以及PM2.5重心偏移情况.结果表明:(1)2014年度1、2、10、11月污染较为严重,12、3、4月次之,5、6、7、8、9月污染最轻.(2)从空间上看,污染较为严重的是秋冬季的内陆主要城市,由以哈尔滨、长春、沈阳以及周边城市重,沿海城市PM2.5污染全年都较轻.(3)重心偏移情况分析表明:上半年由东向西、由北向南;下半年由西向东,由南向北偏移;其中6、7月出现小幅波动.

The changes of PM2.5 concentration and city geographical coordinates collected in 16 cities in the north -east provinces of Liaoning, Shenyang and Heilongjiang, in time and space in year 2014, both by time and by space, and the movements of the most polluted center are analyzed in this paper. The results show that： （1） the most polluted months are January, February, October and November; the less polluted months are December, March and April; and the least polluted months are May, June, July, August, and September. （2） By space, the most polluted areas are inland cities in fall and winter, like Harbin, Changchun, Shenyang and cities near; the cities along the sea are less polluted all over the year. （3） The pollution center movement is from east to west, north to south in the first half of the year, and in reverse direction in the latter half of the year; and there is a little fluctuation in June and July.