Particle formation in Santa Ana, Mexico.

The UA Group studies particle formation in the atmosphere, such as the event shown here from Santa Ana, Mexico, a small town that lies near the southeastern border of Mexico City. The image, captured by a scanning mobility particle sizer, shows a 24-hour plot of particle diameter (vertical axis) versus particle concentration (with warmer colors represent higher concentrations). The plot is dominated by a new particle formation event that began at 9:00 a.m. The new particles grew over time through the uptake of gases such as sulfuric acid, reaching diameters of 40 nanometers and above by 2:00 p.m.



Selected Publications

  • Lawler, M., J. Whitehead, C. O'Dowd, C. Monahan, G. McFiggans, and J.N. Smith, 2014: Composition of 15-85 nm particles in marine air. Atmospheric Chemistry and Physics, 14, 11557-11569, DOI: 10.5194/acp-14-11557-2014. Download PDF
  • Fry, J.L., D.C. Draper, K.C. Barsanti, J.N. Smith, J. Ortega, P.M. Winkler, M. Lawler, S.S. Brown, P.M. Edwards, R.C. Cohen, and L. Lee, 2014: Secondary organic aerosol formation and organic nitrate yield from NO₃ oxidation of biogenic hydrocarbons. Environmental Science & Technology, 48, 11944-11953, DOI: 10.1021/es502204x. Download PDF
  • Bzdek, B.R., M.J. Lawler, A.J. Horan, M.R. Pennington, J.W. DePalma, J. Zhao, J.N. Smith, and M.V. Johnston, 2014: Molecular constraints on particle growth during new particle formation. Geophysical Research Letters, 41, 6045-6054, DOI: 10.1002/2014GL060160. Download PDF
  • Ortega, J., A.A. Turnipseed, A.B. Guenther, T. Karl, D.A. Day, D.J. Gochis, J.A. Huffman, A.J. Prenni, E.J. Levin, S.M. Kreidenweis, P.J. DeMott, Y. Tobo, E. Patton, A. Hodzic, Y. Cui, P. Harley, R. Hornbrook, E.C. Apel, R.K. Monson, A.S. Eller, J.P. Greenberg, M. Barth, P. Campuzano-Jost, B.B. Palm, J.L. Jimenez, A.C. Aiken, M.K. Dubey, C. Geron, J. Offenberg, M.G. Ryan, P.J. Fornwalt, S.C. Pryor, F.N. Keutsch, J.P. DiGangi, A.W. Chan, A.H. Goldstein, G.M. Wolfe, S. Kim, L. Kaser, R. Schnitzhofer, A. Hansel, C.A. Cantrell, R.L. Mauldin, and J.N. Smith, 2014: Overview of the Manitou Experimental Forest Observatory: Site description and selected science results from 2008-2013. Atmospheric Chemistry and Physics, 14, 6345-6367, DOI: 10.5194/acp-14-6345-2014. Download PDF
  • Liao, J., L.G. Huey, Z. Liu, D.J. Tanner, C.A. Cantrell, J.J. Orlando, F.M. Flocke, P.B. Shepson, A.J. Weinheimer, S.R. Hall, K. Ullmann, H.J. Beine, Y. Wang, E.D. Ingall, C.R. Stephens, R.S. Hornbrook, E.C. Apel, D. Riemer, A. Fried, R.L. Mauldin, J.N. Smith, R.M. Staebler, J.A. Neuman, and J.B. Nowak, 2014: High levels of molecular chlorine in the Arctic atmosphere. Nature Geoscience, 7, 91-94, DOI: 10.1038/ngeo2046. Download PDF




ACOM | Atmospheric Chemistry Observations & Modeling