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

by L. I. Kleinman, S. R. Springston, J. Wang, P. H. Daum, Y.-N. N Lee, L. J. Nunnermacker, G. I. Senum, J. Weinstein-Lloyd, M. L. Alexander, J. Hubbe, J. Ortega, R. a. Zaveri, M. R. Canagaratna, J. Jayne show all authors
Atmospheric Chemistry and Physics ()
Get full text at journal


As part of the MILAGRO field campaign, the DOE G-1 aircraft was used to make measurements over and downwind of Mexico City with the objective of determining growth characteristics of aerosols from a megacity urban source. This study focuses on number concentration and size distributions. It is found that a 5-fold increase in aerosol volume is accompanied by about a 5-fold increase in accumulation mode number concentration. There is growth in aerosol volume because there are more accumulation mode particles, not because of an increase in the average size of accumulation particles. Condensation and volume growth laws were examined to see whether either is consistent with observations. Condensation calculations show that the growth of Aitken mode particles into the accumulation mode size range gives the required increase in number concentration. There are minimal changes in the accumulation mode size distribution with age, consistent with observations. Volume-growth in contrast yields a population of large particles, distinctly different from what is observed. Detailed model calculations are required to translate our observations into specific information on the volatility and properties of secondary organic aerosol.

Cite this document (BETA)

Readership Statistics

16 Readers on Mendeley
by Discipline
38% Earth Sciences
31% Environmental Sciences
13% Engineering
by Academic Status
19% Ph.D. Student
19% Researcher (at an Academic Institution)
19% Student (Master)
by Country
19% United States

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Sign up & Download

Already have an account? Sign in