Contributions of local and regional sources to fine PM in the megacity of Paris 1Department of Chemical Engineering, University of Patras, Patras, Greece
06 Mar 2014
2Institute of Chemical Engineering Sciences, Foundation for Research and Technology Hellas (FORTH/ICE-HT), Patras, Greece
3Department of Meteorology & Department of Applied Environmental Science, Stockholm University, Stockholm, Sweden
4Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA
Received: 30 July 2013 – Published in Atmos. Chem. Phys. Discuss.: 08 October 2013 Abstract. The particulate matter source apportionment technology (PSAT) is used
together with PMCAMx, a regional chemical transport model, to estimate how
local emissions and pollutant transport affect primary and secondary
particulate matter mass concentration levels in Paris. During the summer and
the winter periods examined, only 13% of the PM2.5 is predicted to
be due to local Paris emissions, with 36% coming from mid-range
(50–500 km from the center of the Paris) sources and 51% from long range
transport (more than 500 km from Paris).
Revised: 11 January 2014 – Accepted: 21 January 2014 – Published: 06 March 2014
The local emissions contribution to simulated elemental carbon (EC) is
significant, with almost 60% of the EC originating from local sources
during both summer and winter. Approximately 50% of the simulated fresh
primary organic aerosol (POA) originated from local sources and another
45% from areas 100–500 km from the receptor region during summer.
Regional sources dominated the secondary PM components. During summer more
than 70% of the simulated sulfate originated from SO2 emitted more
than 500 km away from the center of the Paris. Also more than 45% of
secondary organic aerosol (SOA) was due to the oxidation of VOC precursors
that were emitted 100–500 km from the center of the Paris. The model
simulates more contribution from long range secondary PM sources during
winter because the timescale for its production is longer due to the slower
PSAT results for contributions of local and regional sources were compared
with observation-based estimates from field campaigns that took place during
the MEGAPOLI project. PSAT simulations are in general consistent (within
20%) with these estimates for OA and sulfate. The only exception is that
PSAT simulates higher local EC contribution during the summer compared to
that estimated from observations.
Citation: Skyllakou, K., Murphy, B. N., Megaritis, A. G., Fountoukis, C., and Pandis, S. N.: Contributions of local and regional sources to fine PM in the megacity of Paris, Atmos. Chem. Phys., 14, 2343-2352, doi:10.5194/acp-14-2343-2014, 2014.