This study was funded by NSF ARC-0714088 and NASA NNX07AR23G, UC Irvine. We thank Mark Flanner for providing the prognostic BC/OC CAM3 code modifications, and for the time-varying aerosol forcing data sets. We also thank Xianwei Wang for providing processed MODIS albedo data and for additional assistance. Finally, we thank Judah Cohen and two anonymous reviewers for their insightful comments that significantly improved this manuscript.
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