Title: Climate impacts from a removal of 1 anthropogenic aerosol emissions
Presenter: Maria Sand
 
(B. H. Samset, M. Sand, C. J. Smith, S. E. Bauer, P. M. Forster, J. S. Fuglestvedt, S. Osprey, C.-F. Schleussner)
 
Limiting global warming to 1.5 or 2.0 ¡C requires strong mitigation of anthropogenic greenhouse gas (GHG) 
emissions. Concurrently, emissions of anthropogenic aerosols will decline, due to co-emission with GHG, and 
measures to improve air quality. The combined climate effect of GHG and aerosol emissions over the industrial era 
is poorly constrained. Here we show the climate impacts from removing present day anthropogenic aerosol 
emissions, and compare them to moderate GHG dominated global warming. Removing aerosols induces a global 
mean surface heating of 0.5-1.1 ¡C, and precipitation increase of 2.0-4.6 %. Extreme weather indices also increase. 
We find a higher sensitivity of extreme events to aerosol reductions, per degree of surface warming, in particular 
over the major aerosol emission regions. In addition to the realized surface temperature change, regional changes 
under near term warming will depend strongly on the balance between aerosol and GHG forcing.