Monthly model output from the Ecosystem Demography model version 2 with hydrodynamics (ED2; Medvigy et al., 2009; Powell et al., 2018) run at Barro Colorado Island (BCI). ED2 was initialized from bare ground at BCI and run with recycled 2008-2014 observed meteorology (i.e. “BASE”) until predictions of above ground biomass (AGB) reached dynamic equilibrium after 700 years (Powell et al., 2018; referred to as simulation year 0 in the simulations presented here)⁠. The four data sets provided here all start after the spin up period and each provide a 50 year (monthly time step) time series of selected ED2 history variables under a particular precipitation scenario: 1) a synthetic El Niño time series (Powell et al., 2017) which produces two exceptionally strong El Niño events within 30 years (the “ENSO” scenario), 2) a “WET” scenario where precipitation increased 30% compared to BASE precipitation, and 3) a “DRY-DS” scenario where dry season (January–April) precipitation was reduced 75% compared to BASE and 4) a continuation of BASE meteorology. Medvigy D, Wofsy SC, Munger JW, Hollinger DY, Moorcroft PR. 2009. Mechanistic scaling of ecosystem function and dynamics in space and time: Ecosystem Demography model version 2. Journal of Geophysical Research: Biogeosciences 114: 1–21. Powell TL, Koven CD, Johnson DJ, Faybishenko B, Fisher RA, Knox RG, McDowell NG, Condit R, Hubbell SP, Wright SJ, et al. 2018. Variation in hydroclimate sustains tropical forest biomass and promotes functional diversity. New Phytologist 219: 932–946. Powell T, Kueppers L, Paton S. 2017. Seven years (2008-2014) of meteorological observations plus a synthetic El Nino drought for BCI Panama.