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A comparison of two representations of subgrid‐scale cloud structure in a global model: radiative effects as a function of cloud characteristics

Two approaches to account for the radiative impacts of subgrid‐scale variability of cloud in a general circulation model (GCM) are compared: (i) deterministic reduction of cloud optical depth imbedded within the radiative transfer scheme and (ii) stochastic subcolumns employed with the Monte Carlo Independent Column Approximation (McICA). This article analyzes impacts, as a function of cloud phase and cloud fraction, due to replacement of deterministic method (which is used currently in the GCM) with the McICA method, as well as the introduction of cloud‐water horizontal inhomogeneity and changes to the description of cloud vertical overlap.