These are sensitivity experiments designed by manipulating the wind forcing that drives the linear ocean model to investigate the difference in equatorial waves in 1999, 2019, and 2021. 

Three forcing regions are marked as R1 (the western equatorial Atlantic region), R2 (the whole equatorial Atlantic region), and R3 (the off-equatorial region).  Selecting one region where the zonal forcing is applied and elsewhere it is eliminated to initiate the event in the three selected years respectively. Thus one group of the experiments for a certain selected year includes five scenarios marked from T0 to T4, where T0 is the reference run, T4 is the scenario excluding the zonal forcing in the whole selected forcing domain and other numbers indicate the selected region where the zonal forcing is still applied. In each scenario, we integrated the LOM for two years from the initial condition by the reference run (T0) at the beginning of the selected year to excite the 1st-4th BCMs independently.