Aerosols

The processes leading to the formation of critical nuclei for aerosol growth are complex and not yet fully understood [1]. Knowledge of the chemical makeup of the nucleated nanoparticles would enable a better estimation of the nucleation rates, which are critical factors in simulations of aerosol formation in climate models [2,3]. Previous underestimation of the atmospheric concentrations of organic acids formed by photochemical oxidation of volatile biogenic and anthropogenic organic compounds may account for the weaker dependence of the nucleation rates on the H2SO4 concentrations found in atmospheric measurements [1,3,4]. Thus, a study of the alternative sources of critical nuclei is necessary. Our research focus in a single product of DMS, methanesulfonic acid (MSA).  In the past five years my research group has made significant contribution by peer review publication [5], presentation at national meetings and invited talks at Universities and Colleges.

References:
  1. R. McGraw, R.J. Zhang, Multivariate analysis of homogeneous nucleation rate measurements: Nucleation in the p-toluic acid/sulfuric acid/water system, J. Chem. Phys. 128 (2008) 064508-1 – 064508-9.
  2. J. Fan, R. Zhang, D. Collins, G. Li, G. Contribution of secondary condensable organics to new particle formation: A case study in Houston, Texas, Geophys. Res. Lett. 33 (2006) L15802-1–L15802-4.
  3. A. Metzgera, B. Verheggenb, J. Dommena, J. Duplissya, A.S.H. Prevota, E. Weingartnera, I. Riipinenc, M. Kulmalac, D.V. Spracklend, K.S. Carslawd, U. Baltenspergera, Evidence for the role of organics in aerosol particle formation under atmospheric conditions, Proc. Natl. Acad. Sci. U.S.A. 107 (2010) 6646–6651.
  4. J. Curtius, E.R. Lovejoy, K.D. Froyd, Atmospheric ion-induced aerosol nucleation, Sp. Science Rev. 125 (2006) 159–167.
  5. Hernández-Soto, E. Jaffer, S. Chen and M.J. Pesch; Theoretical study of CH3SO3-Na+·[H2O]n clusters: Implications for sea-salt methanesulfonate aerosols.Computational and Theoretical Chemistry 1065 (2015) 7 -11