GFDL-CM2.1 Model Volcanic and non-volcanic (i.e., Control) simulation data: This data is for the positive ENSO phase (PENSO, 8 realizations), negative ENSO (NENSO, 8 realizations), and Neutral (NEUTRAL, 8 realizations) cases. There is also one corresponding control each for PENSO, NENSO, and Neutral case. A long control run used to initialize the volcanic experiments with different ENSO phases (PENSO, NENSO, and NEUTRAL) is also included. The model output files are explained below. 1. Volcanic simulation data files produced by initializing the model with a positive ENSO phase (PENSO) are named as follows: t_surf_ps_VOL_R8_PENSO_REALIZATION1.nc , t_surf_ps_VOL_RR1_PENSO_REALIZATION2.nc t_surf_ps_VOL_RR2_PENSO_REALIZATION3.nc , t_surf_ps_VOL_RR4_PENSO_REALIZATION4.nc t_surf_ps_VOL_RR5_PENSO_REALIZATION5.nc , t_surf_ps_VOL_RR6_PENSO_REALIZATION6.nc t_surf_ps_VOL_RR7_PENSO_REALIZATION7.nc , t_surf_ps_VOL_RR9_PENSO_REALIZATION8.nc 2. Volcanic simulation data files produced by initializing the model with the NEUTRAL phase are named as follows: t_surf_ps_VOL_NNN1_NEUTRAL_REALIZATION1.nc , t_surf_ps_VOL_NNN1_1_NEUTRAL_REALIZATION2.nc t_surf_ps_VOL_NNN1_2_NEUTRAL_REALIZATION3.nc, t_surf_ps_VOL_NNN1_3_NEUTRAL_REALIZATION4.nc t_surf_ps_VOL_NNN1_4_NEUTRAL_REALIZATION5.nc , t_surf_ps_VOL_NNN1_5_NEUTRAL_REALIZATION6.nc t_surf_ps_VOL_NNN1_7_NEUTRAL_REALIZATION7.nc , t_surf_ps_VOL_NNN1_8_NEUTRAL_REALIZATION8.nc 3. Volcanic simulation data files produced by initializing the model with a negative ENSO phase (NENSO) are named as follows: t_surf_ps_VOL_RR_TEST_RR1_NENSO_REALIZATION1.nc, t_surf_ps_VOL_RR_TEST_RR2_NENSO_REALIZATION2.nc t_surf_ps_VOL_RR_TEST_RR3_NENSO_REALIZATION3.nc, t_surf_ps_VOL_RR_TEST_RR4_NENSO_REALIZATION4.nc t_surf_ps_VOL_RR_TEST_RR5_NENSO_REALIZATION5.nc, t_surf_ps_VOL_RR_TEST_RR6_NENSO_REALIZATION6.nc t_surf_ps_VOL_RR_TEST_RR7_NENSO_REALIZATION7.nc, t_surf_ps_VOL_RR_TEST_RR9_NENSO_REALIZATION8.nc 4. Each experiment (PENSO, NEUTRAL, and NENSO) has its corresponding control runs which are named as follows: t_surf_ps_NVOL_RR9_PENSO_CONTROL.nc (PENSO Control) t_surf_ps_NVOL_NNN1_NEUTRAL_CONTROL.nc (NEUTRAL Control) t_surf_ps_NVOL_RR_TEST_RR1_NENSO_CONTROL.nc (NENSO control) 5. The long control run (used to initialize the aforementioned volcanic with three ENSO cases) is named as follows: t_surf_LONG_CONTROL.nc