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This is an atmosphere-only compset with perpetual 1850 forcings based on CMIP6 input4mips data. The letter "S" in the name stands for "special" to differentiate from the default atmosphere use case (F1850C5-CMIP6) for the DECK coupled compset A_WCYCL1850S_CMIP6, because some atmospheric settings (e.g., ieflx_opt and initial conditions) are different for the F and A coupled cases.
Ocean Initial Condition:
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