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We use a Lagrangian dispersion model driven by a mesoscale model withfour-dimensional data assimilation to simulate the dispersion of elementalcarbon (EC) over a region encompassing Mexico City and its surroundings. Theregion was the study domain for the 2006 MAX-MEX experiment, which was acomponent of the MILAGRO campaign. The results are used to identify periodswhen biomass burning was likely to have had a significant impact on theconcentrations of elemental carbon at two sites, T1 and T2, downwind of thecity, and when emissions from the Mexico City Metropolitan Area (MCMA) werelikely to have been more important. They are also used to estimate themedian ages of EC affecting the specific absorption of light, αABS,at 870 nm as well as to identify periods when the urbanplume from the MCMA was likely to have been advected over T1 and T2. MedianEC ages at T1 and T2 are substantially larger during the day than at night.Values of αABS at T1, the nearer of the two sites to MexicoCity, were smaller at night and increased rapidly after mid-morning, peakingin the mid-afternoon. The behavior is attributed to the coating of aerosolswith substances such as sulfate or organic carbon during daylight hours, butsuch coating appears to be limited or absent at night. Evidence for this isprovided by scanning electron microscopy images of aerosols collected at thesampling sites. During daylight hours the values of αABS didnot increase with aerosol age for median ages in the range of 1–4 h.There is some evidence for absorption increasing as aerosols were advectedfrom T1 to T2 but the statistical significance of that result is not strong

Applications of lagrangian dispersion modeling to the analysis of changes in the specific absorption of elemental carbon