CESM2 Idealized Experiment Output: Summer atmospheric response to zero May North American snow cover

<p>The National Center for Atmospheric Research&rsquo;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 the&nbsp;Community Atmosphere Model version 6 (CAM6) (Bogenschutz et al., 2018)<span>&nbsp;</span>as the atmospheric component and the Community Land Model version 5 (CLM5) (Lawrence et al., 2019) as the land-surface component.&nbsp;&nbsp;Each model was run with a horizontal resolution&nbsp;of 0.9˚ latitude by&nbsp;1.25˚ longitude.</p> <p>We ran a control simulation in this&nbsp;configuration for ten consecutive years. We then modified the land-surface restart files&nbsp;for 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 rerunning&nbsp;three-month simulations from May through July&nbsp;for each of the ten years.&nbsp;</p>