I am new to the CESM model and have been trying to run the FWHIST simulation starting from 1850. I could only find a preindustrial initial condition (FW1850) or FWHIST starting from 1979. If I were to run an experiment with historical SST prescribed starting from 1850 till the recent year (as much as I can), which one I have to use? Also, if I set the model to start from 1850, does CESM (currently CESM 2.1.5) automatically apply the prescribed SST? If not, what is the available period for the FWHIST? I am confused about the initial condition and available SST data. Thank you!