Seasonal pattem of transport pathways and potential sources of PM2.5 in Chengdu during 2012 2013 were investigated based on hourly PM2.5 data, backward trajectories, clustering analysis, potential source contribution ...Seasonal pattem of transport pathways and potential sources of PM2.5 in Chengdu during 2012 2013 were investigated based on hourly PM2.5 data, backward trajectories, clustering analysis, potential source contribution function （PSCF）, and concentration-weighted trajectory （CWT） method. The annual hourly mean PM2.5 concentration in Chengdu was 97.4 μg. rn . 5, 5, 5 and 3 mean clusters were generated in four seasons, respectively. Short-distance air masses, which travelled within the Sichuan Basin with no specific source direction and relatively high PM2.5 loadings （〉80 μg.m 3） appeared as important pathways in all seasons. These short pathways indicated that emissions from both local and surrounding regions of Chengdu contributed significantly to PM2.5 pollution. The cities in southern Chengdu were major potential sources with PSCF〉0.6 and CWT〉90 /g.m-3.展开更多
文摘Seasonal pattem of transport pathways and potential sources of PM2.5 in Chengdu during 2012 2013 were investigated based on hourly PM2.5 data, backward trajectories, clustering analysis, potential source contribution function （PSCF）, and concentration-weighted trajectory （CWT） method. The annual hourly mean PM2.5 concentration in Chengdu was 97.4 μg. rn . 5, 5, 5 and 3 mean clusters were generated in four seasons, respectively. Short-distance air masses, which travelled within the Sichuan Basin with no specific source direction and relatively high PM2.5 loadings （〉80 μg.m 3） appeared as important pathways in all seasons. These short pathways indicated that emissions from both local and surrounding regions of Chengdu contributed significantly to PM2.5 pollution. The cities in southern Chengdu were major potential sources with PSCF〉0.6 and CWT〉90 /g.m-3.
