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Submicron atmospheric aerosol particles were collected during the MegacityInitiative: Local and Global Research Observation (MILAGRO) in March 2006 atthree platforms located in the Mexico City urban area (at the Mexico CityAtmospheric Monitoring System building – SIMAT), at about 60 km south-eastof the metropolitan area (Altzomoni in the Cortes Pass), and on board theNCAR C130 aircraft. Organic functional group and elemental composition weremeasured by FTIR and XRF. The average organic mass (OM) concentration,calculated as the sum of organic functional group concentrations, was9.9 μg m−3 at SIMAT, 6.6 μg m−3 at Altzomoni, and5.7 μg m−3 on the C130. Aliphatic saturated C-C-H and carboxylicacid COOH groups dominated OM (more than 60%) at the ground sites. On theC130, a non-acid carbonyl C=O, carboxylic acid COOH, and amine NH2groups were observed in concentrations above detection limit only outside theMexico City basin. From the elemental composition of SIMAT samples, weestimated the upper bound of average contribution of biomass burning to theorganic carbon (OC) as 33–39%. The average OM/OC ratio was 1.8 at SIMAT,2.0 at Altzomoni, and 1.6–1.8 on the C130. On the aircraft, higher OM/OCratios were measured outside of the Mexico City basin, north of the urbanarea, along the city outflow direction. The average carboxylic acid toaliphatic saturated ratio at SIMAT reflected a local increase of oxidizedfunctional group concentration in aged particles

Characterization of organic ambient aerosol during MIRAGE 2006 on three platforms