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Measurements of atmospheric gases and fine particle chemistry were made inthe Mexico City Metropolitan Area (MCMA) at a site ~30 km down windof the city center. Ammonium nitrate (NH4NO3) dominated theinorganic aerosol fraction and showed a distinct diurnal signaturecharacterized by rapid morning production and a rapid mid-day concentrationdecrease. Between the hours of 08:00–12:45, particulate water-solubleorganic carbon (WSOC) concentrations increased and decreased in a mannerconsistent with that of NO3−, and the two were highly correlated(R2=0.88) during this time. A box model was used to analyze thesebehaviors and showed that, for both NO3− and WSOC, theconcentration increase was caused primarily (~75–85%) by secondaryformation, with a smaller contribution (~15–25%) from theentrainment of air from the free troposphere. For NO3−, a majority(~60%) of the midday concentration decrease was caused by dilutionfrom boundary layer expansion, though a significant fraction (~40%)of the NO3− loss was due to particle evaporation. The WSOCconcentration decrease was due largely to dilution (~75%), butvolatilization did have a meaningful impact (~25%) on the decrease,as well. The results provide an estimate of ambient SOA evaporation lossesand suggest that a significant fraction (~35%) of the fresh MCMAsecondary organic aerosol (SOA) measured at the surface volatilized

On the volatility and production mechanisms of newly formed nitrate and water soluble organic aerosol in Mexico City