| Summary: | It is well established that model simulations of Arctic sea ice loss can force a significant circulation response. A growing body of work shows the atmospheric response is sensitive to the location of the sea ice anomalies, with the Barents-Kara Seas (BKS) implicated as a partiuclarly important forcing region. Mechanistically, sea ice loss corresponds to warm temperature anomalies, altered surface potential vorticity gradients, and therefore changes in rossby wave dynamics. This Rossby wave forcing is hypothesized to impact midlatitude surface weather either directly by changing synoptic weather patterns or indirectly via propagation into the stratosphere and subsequent downward control. While fall sea ice is declining, fall Siberian snow cover has increased. Variability in fall Siberian snow extent during has also been implicated as a potential driver of northern hemisphere winter weather through its influence on surface heating patterns and subsequent modulation of the Arctic Oscillation. As with sea ice forcing, snow forcing is hypothesized to act via the vertical propagation of waves into the stratosphere. The purpose of this model simulation was to investigate the impact of combined Fall Arctic Sea Ice and Eurasion snow perturbations
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