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Long-term (5-year) measurements of Elemental Carbon (EC) and Organic Carbon(OC) in bulk aerosols are presented here for the first time in theMediterranean Basin (Crete Island). A multi-analytical approach (includingthermal, optical, and thermo-optical techniques) was applied for these ECand OC measurements. Light absorbing dust aerosols were shown to poorlycontribute (+12% on a yearly average) to light absorption coefficient(<i>b</i><sub>abs</sub>) measurements performed by an optical method (aethalometer).Long-range transport of agricultural waste burning from European countriessurrounding the Black Sea was shown for each year during two periods(March–April and July–September). The contribution of biomass burning to theconcentrations of EC and OC was shown to be rather small (20 and 14%,respectively, on a yearly basis), although this contribution could be muchhigher on a monthly basis and showed important seasonal and interannualvariability. By removing the biomass burning influence, our data revealed animportant seasonal variation of OC, with an increase by almost a factor oftwo for the spring months of May and June, whereas BC was found to be quitestable throughout the year. Preliminary measurements of Water SolubleOrganic Carbon (WSOC) have shown that the monthly mean WSOC/OC ratio remainsstable throughout the year (0.45±0.12), suggesting that thepartitioning between water soluble and water insoluble organic matter is notsignificantly affected by biomass burning and secondary organic aerosol(SOA) formation. A chemical mass closure performed in the fine mode(Aerodynamic Diameter, A.D.<1.5μm) showed that the masscontribution of organic matter (POM) was found to be essentially invariableduring the year (monthly average of 26±5%)

Long-term measurements of carbonaceous aerosols in the Eastern Mediterranean: evidence of long-range transport of biomass burning