Table 1 Summary of CESM2 reforecast experiments, including reforecast set name, designation of which model components have climatological and standard ICs, and sources of predictability

Reforecast Set	Climatological IC	Standard IC	Predictability Sources
standard	______	atmosphere, land, & ocean	Clim_ALL, A_ATM, A_LND, A_OCN, C_LNDATM, C_OCNATM, C_LNDOCN
climoATM	atmosphere	land & ocean	Clim_ALL, A_LND, A_OCN, C_LNDATM, C_OCNATM, C_LNDOCN
climoLND	land	atmosphere & ocean	Clim_ALL, A_ATM, A_OCN, C_LNDATM, C_OCNATM, C_LNDOCN
climoOCN	ocean	atmosphere & land	Clim_ALL, A_ATM, A_LND, C_LNDATM, C_OCNATM, C_LNDOCN
climoOCNclimoLND^a	ocean, land	atmosphere	Clim_ALL, A_ATM, C_LNDATM, C_OCNATM
climoATMclimoOCN	atmosphere, ocean	land	Clim_ALL, A_LND, C_LNDATM, C_LNDOCN
climoATMclimoLND	atmosphere, land	ocean	Clim_ALL, A_OCN, C_OCNATM, C_LNDOCN
climoALL	atmosphere, land, ocean	______	Clim_ALL

Ocean here refers to ocean and sea-ice ICs. Predictability sources in the rightmost column include: climatology of atmosphere, land, and ocean initial states (Clim_ALL), atmosphere anomalies (A_ATM), land anomalies (A_LND), ocean anomalies (A_OCN), coupling between the land and atmosphere (C_LNDATM), coupling between the ocean and atmosphere (C_OCNATM), and coupling between the land and ocean (C_LNDOCN). When two model components are set to climatological ICs, we assume their coupling is close to zero.
^aDue to limited computational resources, this set contains only 10 years of reforecasts for the months of April-October, and a full set for November-March. We have verified that a reduced time sample does not significantly change the results: it just makes them slightly noisier in the later weeks.

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