Aerosol can have both direct and indirect impacts on climate. Particles can both scatter sunlight and absorb it resulting in either direct warming or cooling. Black carbon in particles, for example, contributes substantially to warming while sulphate will scatter light and contribute to cooling. Further, particles play a major role in cloud formation and thus also indirectly influence climate. Our research emphasises the direct impacts of particles on climate. Here we are investigating how the optical properties of particles are influenced by their composition and mixing state. We have also examined how the absorption of slight by black carbon can be amplified when particles are coated by other compounds. Finally, we have examined the contributions of different pollution sources to radiative forcing. Overall our research seeks to use field measurements to constrain and reduce the current large uncertainties in modeling the direct impacts of aerosol on climate.
- Knox A., G.J. Evans and B.W. Karney ‘The Contribution of the Social Costs of Air Pollution to the Case for Building Better’ Climate Change technology Conference Montreal June 2013
- Healy, Robert M., Nicole Riemer, John C. Wenger, Michael Murphy, Matthew West, Laurent Poulain, Alfred Wiedensohler, Ian P. O’Connor, Eoin McGillicuddy, John R. Sodeau, Greg J. Evans “Single particle diversity and mixing state measurements” Atm. Chem and Phys. 14 6289-6299 doi: 10.5194/acp-14-6289-2014 (June 2014) (IF 5.4)
- Healy R. J. Wang , C-H. Jeong , A. Lee , M. Willis , E. Jaroudi , N. Zimmerman , N. Hilker , M. Murphy , S. Eckhardt , A. Stohl , J. Abbatt , J. Wenger and G. Evans “Light absorbing properties of ambient black carbon and brown carbon from fossil fuel and biomass burning sources” J. Geophys. Res. 120 doi:10.1002/2015JD023382. (Online June 2015) (IF 3.44)
- Corbin J.C., P. J.G. Rehbein, G. J. Evans and J. P.D. Abbatt “Dust and Combustion Particles as Ice Nuclei in an Urban Environment: Evidence from Single-Particle Mass Spectrometry” Atmos. Environ. 51, 286-292 (2012) doi: 10.1016/j.atmosenv.2012.01.007
- Knox A., Evans, G.J., Brook, J.R., Yao, X., Jeong, C.-H., Godri, K.J., Sabaliauskas, K., Slowik, J.G. “Mass Absorption Cross-section of Ambient Black Carbon Aerosol in Relation to Chemical Age” Aerosol Sci. Technol. 43:6 522-532, (2009) doi: 10.1080/02786820902777207
- Katrina MacDonald “ Black carbon in arctic snow” (MASc thesis in progress)
- Joel Corbin “Development and Deployment of a continuous-Flow Diffusion Chamber for Field Measurement of Atmospheric Ice Nuclei” MASc thesis 2011