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Prof. Andreas Zuend

Andreas Zuend

Aerosols, Clouds and Climate

Office: Burnside Hall 809
Tel.: (514) 398-7420
Fax.: (514) 398-6115
andreas [dot] zuend [at] mcgill [dot] ca (E-Mail)

Research interests

The ‘Aerosols, Clouds and Climate’ group works in the field of ‘Atmospheric Chemistry and Physics’ with a focus on the chemical and microphysical processes governing the formation and transformations of atmospheric aerosols.

Atmospheric aerosols – tiny particles suspended in the air – are of fundamental importance for urban and regional air quality and the global climate system. Aerosols are among the least understood and quantified climate agents, affecting Earth’s radiation balance directly as well as indirectly via their crucial role in the formation of cloud droplets and influence on cloud microphysics. Part of the lack of knowledge is due to the complexity and variety of primary and secondary particle sources, the chemical composition, phases, and physical states of aerosols and the evolution of these properties by means of chemical and physical processing in the air.

Our research projects are motivated by the need to understand, on a quantitative level, the chemical thermodynamics, reactions, and mass transfer kinetics of complex mixtures consisting of tens to thousands of oxidized organic compounds, water, and inorganic electrolytes that form and characterize the majority of secondary aerosols in the troposphere.

Process-level understanding of atmospheric aerosols based on experiment and theory and the development of numerical models and system analysis tools are core components of our research activities. Our motivation is to translate process-level knowledge of gas-aerosol chemistry and thermodynamics into information and constraints useful for the design of computationally efficient descriptions of physicochemical processes in atmospheric large-scale models.

Find out more on our website.

Recent Publications

  • Shiraiwa, M., Yee, L. D., Schilling, K. A., Loza, C. L., Craven, J. S., Zuend, A., Ziemann, P. J., and Seinfeld, J. H.: Size distribution dynamics reveal particle-phase chemistry in organic aerosol formation, PNAS, 110, 11746–11750, doi:10.1073/pnas.1307501110, 2013.
  • Shiraiwa M., Zuend, A., Bertram, A., and Seinfeld, J. H.: Gas-particle partitioning of atmospheric aerosols: Interplay of physical state, non-ideal mixing and morphology, Phys. Chem. Chem. Phys., 15, 11441–11453, doi:10.1039/C3CP51595H, 2013.
  • Huisman, A. J., Krieger, U. K., Zuend, A., Marcolli, C., and Peter T.: Vapor pressures of substituted polycar-boxylic acids are much lower than previously reported, Atmos. Chem. Phys., 13, 6647–6662, doi:10.5194/acp-13-6647-2013, 2013.
  • Loza, C. L., Coggon, M. M., Nguyen, T. B., Zuend, A., Flagan, R. C., and Seinfeld J. H.: On the Mixing and Evaporation of Secondary Organic Aerosol Components, Environ. Sci. Technol., 47, 6173–6180, doi:10.1021/es400979k, 2013.
  • Hersey, S. P., Craven, J. S., Metcalf, A. R., Lin, J., Lathem, T., Suski, K. J., Cahill, J. F., Duong, H. T., Sorooshian, A., Jonsson, H. H., Shiraiwa, M., Zuend, A., Nenes, A., Prather, K. A., Flagan, R. C., and Seinfeld, J. H.: Composition and hygroscopicity of the Los Angeles Aerosol: CalNex, J. Geophys. Res.: Atmos., 118, 3016–3036, doi:10.1002/jgrd.50307, 2013.
  • Zuend, A. and Seinfeld, J. H.: A practical method for the calculation of liquid–liquid equilibria in multicomponent organic–water–electrolyte systems using physicochemical constraints, Fluid Phase Equilib., 337, 201–213, doi:10.1016/j.fluid.2012.09.034, 2013.
  • Song, M., Marcolli, C., Krieger, U. K., Zuend, A., and Peter, T.: Liquid-liquid phase separation in aerosol particles: dependence on O:C, organic functionalities, and compositional complexity, Geophys. Res. Lett., 39, L19801, doi:10.1029/2012GL052807, 2012.
  • Lienhard, D. M., Bones, D. L., Zuend, A., Krieger, U. K., Reid, J. P., and Peter, T.: Measurements of thermodynamic and optical properties of selected aqueous organic and organic-inorganic mixtures of atmospheric relevance, J. Phys. Chem. A, 116, 9954–9968, doi:10.1021/jp3055872, 2012.
  • Zuend, A. and Seinfeld, J. H.: Modeling the gas-particle partitioning of secondary organic aerosol: the importance of liquid-liquid phase separation, Atmos. Chem. Phys., 12, 3857–3882, doi:10.5194/acp-12-3857-2012, 2012.
  • Song, M., Marcolli, C., Krieger, U. K., Zuend, A., and Peter, T.: Liquid-liquid phase separation and morphology of internally mixed dicarboxylic acids/ammonium sulfate/water particles, Atmos. Chem. Phys., 12, 2691–2712, doi:10.5194/acp-12-2691-2012, 2012.
  • Lienhard, D. M., Zobrist, B., Zuend, A., Krieger, U. K., and Peter, T.: Experimental evidence for excess entropy discontinuities in glass-forming solutions, J. Chem. Phys., 136, 074515, doi:10.1063/1.3685902, 2012.
  • Zuend, A., Marcolli, C., Booth, A. M., Lienhard, D. M., Soonsin, V., Krieger, U. K., Topping, D. O., McFiggans, G., Peter, T., and Seinfeld, J. H.: New and extended parameterization of the thermodynamic model AIOMFAC: calculation of activity coefficients for organic-inorganic mixtures containing carboxyl, hydroxyl, carbonyl, ether, ester, alkenyl, alkyl, and aromatic functional groups, Atmos. Chem. Phys., 11, 9155–9206, doi:10.5194/acp-11-9155-2011, 2011.