Impact of Forest Fires in Russia on PM2.5 in North China:A Case Study of Hohhot
In order to analyze the abnormal increase of PM2.5 concentration in Hohhot City in August 2021,multi-source data in-cluding ground-based observations,satellite remote sensing,and MERRA-2 were analyzed with methods such as feature ratio meth-od and potential source analysis.The results show that the long-distance transmission of pollutants produced by forest fires in Ya-kutsk,Russia was the main source of high PM2.5 values in Hohhot in early to mid August and the contribution of regional transmis-sion to PM2.5 was approximately 59.1%.The correlation coefficient between the column concentration of MERRA-2 black carbon aerosol and the number of MODIS satellite fire points was 0.80.As a tracer for forest fires,the column concentration of MERRA-2 black carbon has good indicative significance for analyzing the transmission path of smoke and dust generated by forest fires.In ad-dition to Hohhot,other cities in Inner Mongolia and three northeastern provinces in China were also affected by transmission and the degree of influence showed a weakening trend from west to east.The two main transmission channels in this process were"Rus-sia-Mongolia-Inner Mongolia"and"Russia-northern of Mongolia-northeast of Inner Mongolia-west of Northeast China".This study provided a reference for exploring the impact of long-distance transmission of foreign pollutants on China.
forest firePM2.5black carbonpotential sourcesatellite fire point
NETL
NSTL
万方数据
