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We characterize more precisely the conditions under which these convective drizzle events occur and investigate how a simple modification to the ACME v1 model, which alleviates convective drizzle, impacts the model’s climate. We find that drizzle occurs globally, but primarily in oceanic trade cumulus regions, where daily drizzle frequencies can exceed 90%. About 80% of this drizzle comes from the deep convective scheme. As expected, drizzle falls primarily from clouds in subsiding regions with modest precipitable water. With the modified simulations, we examine the dynamic and thermodynamic response of the climate to reduced drizzle to test whether suppressing convective drizzle leads to (a) increased cloud water path, (b) strengthened and improved intraseasonal variability in the tropics, and (c) an improvement in the double-ITCZ bias of the model by suppressing the early triggering of convection upstream from the observed regions of deep convection.
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