Aerosols

SCENGEN 4.1 includes one set of GCM patterns that describe the response of regional climate to sulfate aerosol forcing. These results are from the UIUC GCM. If  'Aerosol effects'  is selected above the list of GCMs on the Models window, then the displayed scenarios will include the regional effects of sulfate aerosol forcing. In this case, the global-mean temperature change displayed on the main SCENGEN screen will result from the combined effect of greenhouse gas and aerosol forcing (otherwise this global temperature change value will reflect only greenhouse gas forcing). The default setting when first entering SCENGEN does not include aerosol effects.