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Compared to the earlier model configurations, the atmospheric AV1C-04P version had has some code and input changes and parameter tunings that reduce biases in aerosol spatial distributions, aerosol indirect effects, low clouds, and precipitation. We evaluated aerosols and their radiative forcings in both free-running and nudged low-resolution (ne30) simulations. The two gave quite consistent results in terms of aerosols, although the nudged simulations were conducted for just one year (versus ten years for the free-running ones). We further performed a few sets of one-year nudged simulations to evaluate the effect on aerosol radiative forcing, separately, by the new treatments implemented in the ACME (v1-beta) model, including wet scavenging processes (i.e., aerosol activation, cloud processing, and wet removal), marine organics, ice nucleation, and deposition of light-absorbing particles to snowpack and sea ice. We will present the results of these simulations at the meeting.