The effect of human activities on climate is a grand challenge facing society today. Humans influence climate in many ways. Emissions of greenhouse gases (GHGs) tend to warm climate, by reducing the amount of infrared radiation that is emitted to space. Increased levels of suspended atmospheric particles (“aerosols”) exert a net cooling effect by directly scattering and absorbing of incoming solar radiation. Aerosols also affect clouds by acting as the seed for droplet (or ice crystal) formation. “Seeding” of clouds by anthropogenic pollution is thought to cool climate by modulating cloud reflectivity and development. Aerosol variations have also been proposed to affect the development of storm systems, precipitation and the hydrological cycle overall. Quantitatively constraining aerosol impacts on clouds and climate however is very uncertain and significantly affects predictions of climate sensitivity to GHGs levels. The large uncertainty originates largely from the complex and multi-scale coupling of aerosols and clouds. Added to this complexity is the large variability and range of aerosol types, each of which is characterized with its own ability to absorb/scatter light and nucleate droplets and ice crystals.
- Laboratory and field studies on CCN/IN activity and aerosol-cloud interactions.
- Molecular simulation of aerosol-water interactions.
Morales Betancourt, R., and Nenes, A. (2014) Aerosol Activation Parameterization: The population splitting concept revisited, Geosci.Mod.Dev., 7, 2345–2357, doi: 10.5194/gmd-7-2345-2014
Fanourgakis, G. S. et al (2019) Evaluation of global simulations of aerosol particle and cloud condensation nuclei number, with implications for cloud droplet formation, Atmos.Chem.Phys., 19, 8591-8617, doi: 10.5194/acp-19-8591-2019