Simulation Bias Analysis of Pacific North Equatorial Countercurrent in LICOM3.0 Ocean Model

In this study, the CORE-IAF (Coordinated Ocean-ice Reference Experiments - Interannual Forcing) dataset was used to force two ocean models, LICOM3 (LASG/IAP Climate System Ocean Model Version 3), and POP2 (Parallel Ocean Program version 2). The North Equatorial Countercurrent (NECC) simulated by these two models was to be found weaker than the observation. These results were consistent with the findings of Sun et al. (2019), which further suggests that surface wind stress and its curl are the most important forcing terms in correctly simulating the NECC in ocean models. At the same time, the differences in NECC dynamical mechanisms between LICOM3 and POP2 were analyzed, including wind stress, advection, and other terms. In spite of the same CORE-IAF dataset being used to force these two ocean models, the influences of dynamical forcing terms (wind stress, advection, and other terms) were not exactly the same.