The Impact of Mean State Errors on Equatorial Atlantic Interannual Variability in a Climate Model

摘要: Observations show that the Equatorial Atlantic Zonal Mode (ZM) obeys similar physics to El Nino Southern Oscillation (ENSO): positive Bjerknes and delayed negative feedbacks. This implies ZM may be predictable on seasonal timescales, but models demonstrate little prediction skill in this region. In study using different configurations of Kiel Climate Model (KCM) exhibiting levels systematic error, we a reasonable simulation depends realistic representation mean state, i.e., surface easterlies along equator, upward sloping thermocline east, with an equatorial SST cold tongue east. We further attribute differences interannual variability among simulations individual components Differences seasonality are similarly related impact biases feedback. Our results suggest model must enhanced enable skillful predictions Tropical Sector, although some improvement regard achieved by momentum flux correction. pertains especially phase locking variability.