Towards a better understanding of fine PM sources: online and offline datasets combination in a single PMF

Co-located one-year measurements of non-refractory submicronic particulate matter (NR-PM1), black carbon (BC) and metals, obtained respectively, by a Q-ACSM (Aerodyne Research Inc.), an Aethalometer (Aerosol d.o.o.) and offline fine PM samples collected on quartz-fibre filters, were combined in a single PMF in two different resolutions (30 minutes for the NR-PM1 and BC, and 24h every 4 days for the offline samples). The multi-time resolution PMF (MTR-PMF) was run varying both the time resolution (averaging the dataset) and the uncertainty weightings of both datasets in order to assess the impact of these variations on the model output. The resolution assessment revealed that averaging the high-resolution data was disadvantageous in terms of model residuals and environmental feasibility. Regarding uncertainty weightings, overweighting the uncertainties of the 24-h dataset dividing them by two provided the most optimal scaled residuals adjustment. The MTR-PMF was run with the optimised time resolution and uncertainty weightings retrieving eight PM1 sources: ammonium sulphate (AS) + heavy oil combustion (24%), ammonium nitrate (AN) and ammonium chloride (15%), fresh SOA (15%), traffic (14%), biomass burning (11%), aged SOA + mineral dust (8%), urban mix (7%) and cooking-like organic aerosol + industry (6%). The MTR-PMF technique allowed the identification of two more sources respect a dataset containing the same species at a 24h time resolution (base case) and four more respect to the conventional offline and PMF, proving that the combination of both high and low time resolution data through MTR-PMF is significantly beneficial for SA. This is especially true for those sources which have been disentangled with respect to the conventional and base case PMFs.

Bibliographic Details

Main Authors:	Vía, Marta, Yus-Díez, Jesús, Canonaco, Francesco, Petit, Jean-Eudes, Hopke, Philip, Reche, Cristina, Pandolfi, Marco, Ivančič, Matic, Rigler, Martin, Querol, Xavier, Alastuey, Andrés, Minguillón, María Cruz, Favez, Olivier
Format:	comunicación de congreso biblioteca
Language:	English
Published:	European Geosciences Union 2023-04-26
Subjects:	PM sources, PMF, Make cities and human settlements inclusive, safe, resilient and sustainable,
Online Access:	http://hdl.handle.net/10261/353765
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