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Compared to the earlier model configurations, the atmospheric AV1C-04P version 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 using both 10-year free-running and 1-year nudged low-resolution (ne30) simulations. The two gave quite consistent results in terms of aerosolsaerosol radiative forcing, although the nudged simulations were conducted for just one year (versus ten years for the free-running ones)much shorter duration. We further performed a few sets of oneperformed additional 1-year nudged simulations to evaluate the effect individual effects on aerosol radiative forcing , separately, by a few of 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.