Neglect by GCMs of subgrid‐scale horizontal variations in cloud‐droplet effective radius: A diagnostic radiative analysis

Abstract Output from a global climate model (GCM) that employed a low‐resolution two‐dimensional cloud‐system‐resolving model (CSRM) in each column is used to assess the radiative impact of neglecting subgrid‐scale horizontal variations in cloud‐droplet effective radius r e . For this diagnostic study, only liquid‐phase variations in r e are addressed; the ice‐cloud particle distributions are assumed to be constant. For reference calculations, …