کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4438295 | 1620400 | 2013 | 11 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The impact of long-range-transport on PM1 and PM2.5 at a Central Mediterranean site The impact of long-range-transport on PM1 and PM2.5 at a Central Mediterranean site](/preview/png/4438295.png)
Water soluble ions, methanesulfonate, organic and elemental carbon, and metals in PM2.5 and PM1 samples were analysed by Positive Matrix Factorization to identify and quantify major sources of fine particles at a Central Mediterranean site. The cluster analysis of four-day back trajectories was used to determine the dependence of PM2.5 and PM1 levels and composition on air-flows. The cluster analysis has identified six, six, and seven distinct air-flow types arriving at 500, 1500, and 3000 m above sea level (asl), respectively. Slow-west (Wslow) and north-eastern (NE) flows at 500 and 1500 m asl were the most frequent and were associated with the highest PM2.5 and PM1 concentrations. The PM concentrations from combustion sources including biomass burning were at their maximum under north-western (NW) flows. Similarly, the ammonium sulphate source was enhanced under Wslow and NE flows. South-eastern Mediterranean Sea air-flows were associated with the highest PM2.5 concentrations due to the heavy-oil-combustion source and the highest PM2.5 and PM1 concentrations due to the secondary marine source. PM2.5 concentrations due to the reacted dust and traffic source and PM1 concentrations due to the nitrate with reacted dust and mixed anthropogenic source showed no clear dependence on air-flows. This work highlights the different impact of aerosol sources on PM2.5 and PM1 fractions, being PM1 more adequate to control anthropogenic emissions from combustion sources.
► Chemical characterization of PM1 and PM2.5 samples at a Central Mediterranean site.
► PM source identification and quantification by Positive Matrix Factorization.
► Potential PM source location by back trajectory analysis.
► Cluster analysis of analytical back trajectories.
► Relations between PM sources and corresponding locations.
Journal: Atmospheric Environment - Volume 71, June 2013, Pages 176–186