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Abstract
Simulating precipitation processes, clouds, and hydrologic cycle at regional scale over the Continental US remains challenging for global climate models. ACME v1 atmosphere model has implemented many new features in the physics parameterizations. It is important to assess the persistent model biases over the Continental US in ACME v1 and exam how the biases response to different model settings. This study conducts ACME v1 5-year AMIP simulations and several sets of CAPT simulations for the summer of 2011 with the regular grid and CONUS RRM grid. Based on observations, especially ARM observations, the evolution of cloud and precipitation biases over the Continental US with various model parameter settings is analyzed in this study.