These data indicate that under many atmospherically - relevant conditions
SOA particles are significantly more viscous and orders of magnitude less volatile than assumed in traditional modeling approaches;
SOA formation yields can be significantly higher than previously reported values; and anthropogenic pollution enhance loadings of
SOA from biogenic
precursors.
The climate feedbacks involved with these changes, which are key in understanding the climate system as a whole, include: + the importance of aerosol absorption on climate + the impact of aerosol deposition which affects biology and, hence, emissions of aerosols and aerosol
precursors via organic nitrogen, organic phosphorus and iron fertilization + the importance of land use and land use changes on natural and anthropogenic aerosol sources + the
SOA sources and impact on climate, with special attention on the impact human activities have on natural
SOA formation In order to quantitatively answer such questions I perform simulations of the past, present and future atmospheres, and make comparisons with measurements and remote sensing data, all of which help understand, evaluate and improve the model's parameterizations and performance, and our understanding of the Earth system.