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Chemical characterization of fine particles (PM) at a coastal site in the South Western Mediterranean during the ChArMex experiment. | LitMetric

AI Article Synopsis

  • The ChArMEx project involved a year-long study (August 2012 to August 2013) in rural Algeria to analyze fine aerosol seasonal variability and chemical composition in the southern Mediterranean.
  • Over 350 filters were collected and analyzed, revealing PM mass concentrations that peaked in late summer and early summer of the following year, with particulate organic matter making up the largest portion at 50%.
  • Average organic carbon concentrations ranged from 1.66 to 6.05 μgC/m, and the OC/EC ratio was about 5.1, suggesting similar characteristics to other Mediterranean locations but lower than some areas in Spain.

Article Abstract

As part of the ChArMEx project (Chemistry-Aerosol Mediterranean Experiment, http://charmex.lsce.ipsl.fr), one year of continuous filter sampling was conducted from August 2012 to August 2013 at a rural (coastal) site in Algeria aiming to better document fine aerosol seasonal variability and chemical composition in the Southern part of the Mediterranean. Over 350 filters have been collected, weighted, and analyzed for the main ions and organic and elemental carbon. The obtained mass concentrations varied between 2.5 and 50.6 μg/m for PM. The annual modulations of PM showed higher concentrations in the end summer 2012 and the early summer 2013 (28.50 μg/m in August 2012, 20.23 μg/m in September 2012, 20.19 μg/m in July 2013, and 17.88 μg/min August 2013). The particulate organic matter (POM) presented the greatest contribution (50%), followed by the secondary inorganic aerosols (SIA, 27%). The average organic carbon OC concentrations ranged from 1.66 to 6.05 μgC/m. The average elemental carbon EC concentrations ranged from 0.92 to 3.49 μgC/m and contributed 7% of the PM mass to Bou-Ismail. The average value of the OC /EC ratio was close to 5.1 in Bou-Ismail, and was close to that found in Finokalia 4 (Greece 2004, 2006) but was lower than that of Montseny 11 (Spain 2002-2007) Western Mediterranean Basin (WMB). The concentrations of water-soluble organic carbon WSOC in the PM ranging from 0.66 to 3.70 μg/m recorded the minimum level in March 2013, and the maximum level in August 2012, with an average of 2.02 μg/m.

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http://dx.doi.org/10.1007/s11356-020-08168-7DOI Listing

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