My research interest range from turbulence affecting cloud droplet growht to the global scale circulation. A general theme is that I am developing and applying numerical models for small-scale atmospheric processes and study their effects using the models in combinating with observations. My doctoral thesis that I defended in 1995 discussed environmental modeling of the air quality in Athens, Greece. After a postdoctoral period in John Seinfeld's group at CALTECH, which was devoted to cloud microphysics and turbulence in marine stratocumulus, I returned to Sweden in 1997.

Since 1998, I have been working at MISU. My current projects concern global climate models and how small-scale processes such as turbulence and clouds are described in them and what effect they have on the climate and climate change. A focus area is the Arctic weather and climate change and another is how the boundary layer interacts with the large-scale dynamics.

The e-science part of climate and weather research is another of my interests and I am strongly involved in the Swedish e-Science Research Centre (SeRC) and I am engaged in the Bolin Centre for Climate Research (BolinC).

Some of my internationally engagements include member of the science steering groups of the WWRP Polar Projects (PPP, 2011 - 2022 and PCAPS 2024 - ) and the WCRP Polar Climate Prediction Initiative (PCPI 2012 - 2018). I was a member of the ECMWF Scientific Advisory Committee (SAC, 2017 - 2024) and affiliated scientist at NCAR (2016 - 2025).