Organic aerosol source apportionment by using rolling positive matrix factorization: Application to a Mediterranean coastal city

We investigated the contributions and evolution of organic aerosol (OA) sources at Marseille-Longchamp supersite (MRS-LCP, France) based on Time-of-flight Aerosol Chemical Speciation Monitor (ToF-ACSM) measurements non-refractory PM1 over a fourteen-month period (1 February – 3 April 2018). The OA source apportionment was performed by positive matrix factorization (PMF) using novel “rolling window” approach implemented in Source Finder Professional (SoFi Pro). Here, PMF is 14-days window moving entire dataset, order to account for temporal variability profiles. Six factors were resolved, including hydrocarbon-like (HOA) which related traffic exhausts, cooking-like (COA), biomass burning (BBOA), less oxidized (LOOA), more (MOOA) new defined mix between shipping industrial plumes (Sh-IndOA). While HOA COA consistently contribute total with average 11.2% (ranging 9.2 12.1% seasons) 11.5% (11–12.1%), respectively, BBOA (11.7% average) shows larger seasonal 18% winter no contribution summer. profiles during attributed fresh emissions from domestic heating, oxygenated assigned regional land agricultural waste spring early autumn. Sh-IndOA fraction estimated 4.5% (3.7–6.1%) contributes mass concentrations minor extent. secondary (SOA) includes both LOOA 21.5% (18.8–27.2%) MOOA 39.6% (36.8–42.6%). Based f44/f43 analysis these appeared be linked biogenic influences summer, whereas associated anthropogenic (biomass road traffic) rest year. investigation geographical origins suggests some influence air masses transported Rhône Valley west basin Mediterranean Sea.