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The evolving roles of anthropogenic aerosols (AER) and greenhouse gases (GHG) in driving large-scale patterns of precipitation and SST trends during 1920–2080 are studied using a new set of ‘‘all-but-one-forcing’’ initial-condition large ensembles (LEs) with the Community Earth SystemModel version 1 (CESM1), which complement the original ‘‘all-forcing’’ CESM1LE (ALL). The large number of ensemblemembers (15–20) in each of the new LEs enables regional impacts of AER and GHG to be isolated from the noise of the model’s internal variability. Our analysis approach, based on running 50-yr trends, accommodates geographical and temporal changes in patterns of forcing and response. AER are shown to be the primary driver of large-scale patterns of externally forced trends inALL before the late 1970s, andGHG to dominate thereafter. TheAER and GHG forced trends are spatially distinct except during the 1970s transition phase when aerosol changes are mainly confined to lower latitudes. The transition phase is also characterized by a relative minimum in the amplitude of forced trend patterns in ALL, due to a combination of reduced AER and partially offsetting effects of AER andGHG. Internal variability greatly limits the detectability of AERandGHG-forced trend patterns in individual realizations based on pattern correlationmetrics, especially during the historical period, highlighting the need for LEs. We estimate that,20% of the spatial variances of observed precipitation and SST trends are attributable to AER and GHG forcing, although model biases in patterns of forced response and signal-to-noise may affect this estimate.

Isolating the Evolving Contributions of Anthropogenic Aerosols and Greenhouse Gases: A New CESM1 Large Ensemble Community Resource