CESM Research Tools: CLM4.0 and CLM4.5 Offline Model Forcing Data Archived from CCSM4 historical and RCP simulations
CLM Offline CCSM4 Coupler History Model Forcing Data
3-hourly forcing data (coupler history) is available for a historical CCSM4 simulation and for each of the RCPs through the Earth System Grid (registration required)