Eddy-permitting simulations of the sub-polar North Atlantic: impact of the model bias on water mass properties and circulation

摘要: Some previous studies demonstrated that model bias has a strong impact on the quality of long-term prognostic simulations sub-polar North Atlantic Ocean. Relatively water mass characteristics is observed in both eddy-permitting and eddy-resolving simulations, suggesting an increase resolution does not reduce significantly bias. This study attempt to quantify simulated circulation ocean. done through comparison with results from two other runs which constrained by using spectral nudging. In first run, temperature salinity are nudged towards climatology whole column. second nudging applied surface 30 m layer at depths below 560 only. The biases unconstrained run similar those reported studies. intermediate waters Labrador Sea increases respect climatology, reduces stability deep convection artificially intensified transport gyre stronger than observations. particular, relatively salty warm Irminger into unrealistically high. While column closest observations, depth winter underestimated model. layers only close observations same time represent well terms its intensity position. source discussed.