Checkerboard patterns in E3SMv2 and E3SM-MMFv2

Abstract. An unphysical checkerboard pattern is identified in E3SMv2 and E3SM-MMF that detectable across a wide range of timescales, from instantaneous snapshots to multi-year averages. A detection method developed quantify characteristics the signal by cataloguing all possible configurations eight adjacent neighbors for each cell on model's cubed sphere grid using daily mean data. The only found cloud-related quantities, such as precipitation liquid water path. Instances pure partial are occur more often when compared satellite data regridded model grid. Continuous periods state be persistent both models data, with exhibiting persistence than E3SMv2. direct consequence recently added deep convective trigger condition based dynamically generated CAPE (DCAPE). In associated “trapping” cloud-scale fluctuations within embedded cloud-resolving model. Solutions remedy this issue discussed.