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As part of the MILAGRO field campaign, the DOE G-1 aircraft was used to makemeasurements over and downwind of Mexico City with the objective ofdetermining growth characteristics of aerosols from a megacity urban source.This study focuses on number concentration and size distributions. It isfound that a 5-fold increase in aerosol volume is accompanied by about a5-fold increase in accumulation mode number concentration. There is growthin aerosol volume because there are more accumulation mode particles, notbecause of an increase in the average size of accumulationparticles. Condensation and volume growth laws were examined to seewhether either is consistent with observations. Condensation calculationsshow that the growth of Aitken mode particles into the accumulation modesize range gives the required increase in number concentration. There areminimal changes in the accumulation mode size distribution with age,consistent with observations. Volume-growth in contrast yields a populationof large particles, distinctly different from what is observed. Detailedmodel calculations are required to translate our observations into specificinformation on the volatility and properties of secondary organic aerosol

The time evolution of aerosol size distribution over the Mexico City plateau