Sammendrag
Observations and model results show an increase in extreme precipitation with global
warming since the 1950s. During the last decades there have also been strong
trends in anthropogenic aerosol concentration, aerosols that may affect cloud and precipitation
processes that develop these extreme events. As human activities are the source of anthropogenic
aerosols, they tend to be concentrated over highly populated regions where the potential cost and
impact of extreme precipitation is high. In this study we investigate the link between extreme
precipitation and aerosol particles in the atmosphere by using the cloud resolving WRF model. The
model is set up with an aerosol-dependent cloud microphysics scheme that include
processes such as; the increase in smaller droplets in aerosol rich clouds, the change in
cloud reflective properties that can reduce surface evapotranspiration as well as a deepening of
convective clouds and possible an increase in precipitation intensity. The model is run over several
years in a stable climate to distinguish how these processes influence extreme
precipitation separately from the extreme precipitation increase due to global warming
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