The Convective‐To‐Total Precipitation Ratio and the “Drizzling” Bias in Climate Models

Overestimation of precipitation frequency and duration while underestimating intensity, that is, the “drizzling” bias, has been a long-standing problem global climate models. Here we explore this issue from perspective partitioning. We found most models in Climate Model Intercomparison Project Phase 5 (CMIP5) have high convective-to-total (PC/PR) ratios low latitudes. Convective higher longer but lower intensity than non-convective many As result, PC/PR ratio contributes to bias over The associated increase as model resolution coarsens 0.5° 2.0°, resolution's effect weakens grid spacing increases 2.0° 3.0°. Some CMIP6 show reduced with decreased ratio. Thus, more reasonable partitioning, along finer should alleviate within current