| Summary: | The National Center for Atmospheric Research’s Community Earth System Model version 2.2 (CESM2) (Danabasoglu et al., 2020) was run in the Atmospheric Model Intercomparison Project (AMIP) configuration. SSTs and sea-ice were prescribed as monthly varying seasonal cycles based on the observed climatology from 2005 to 2015 (i.e., component set: F2010climo) (Hurrell et al., 2008). We employed theCommunity Atmosphere Model version 6 (CAM6) (Bogenschutz et al., 2018) as the atmospheric component and the Community Land Model version 5 (CLM5) (Lawrence et al., 2019) as the land-surface component.Each model was run with a horizontal resolutionof 0.9˚ latitude by1.25˚ longitude. We ran a control simulation in thisconfiguration for ten consecutive years. We then modified the land-surface restart filesfor May 1st of each year by reducing the snow cover over North America to zero. Using these modified files, we then completed a reduced snow simulation by rerunningthree-month simulations from May through Julyfor each of the ten years.
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