My research focuses on the role of short-lived climate forcers in the Earth's climate system. I develop global models to simulate the chemical composition of the atmosphere in interaction with the physical climate and other components of the Earth system. I use these models to study the global and regional climate effects of aerosols, tropospheric ozone, and precursor gases.
I contribute to the development of the global climate model EC-Earth. I am chair of the working group on Atmospheric Composition of the international EC-Earth consortium. One line of R&D aims at the further integration of Earth system components into the model. Part of this work will be carried out within the EU Horizon 2020 project CRESCENDO (2015-2020). I am project leader for CRESCENDO on behalf of KNMI. I also contribute to the development of the global atmospheric composition model TM5. I am a member of the TM5 Steering Committee. In recent years, I have made contributions to international projects such as RETRO, AMMA, ACCENT-MIP, a Royal Society study on ground-level ozone, CLIMAQS, ACCMIP, and AeroCom. I am currently making preparations for participating in CMIP6 and AerChemMIP. I am a supervisor in a number of PhD projects, carried out in collaboration with Utrecht University (UU) and Wageningen University and Research centre (WUR).