Effect of mesoscale wind stress-SST coupling on the Kuroshio extension jet

Effect of mesoscale wind stress-SST coupling on the Kuroshio extension jet is studied using the Regional Ocean Modeling System. The mesoscale wind stress perturbation( τ_(MS)) is diagnostically determined from modelled mesoscale SST perturbation(SST_(MS)) by using their empirical relationship derived from corresponding observation. From comparing two experiments with and without the τ_(MS) feedback, it is found that the interactively represented τ_(MS)-SST_(MS) coupling can modulate the kinetic energy along the Kuroshio extension jet, with little effect on the Kuroshio pathway. Similar results are also obtained in three additional sensitivity experiments, which consider half strength of the τ_(MS), and the momentum flux and heat flux effect induced by τ_(MS), respectively. That means simply taking into account the τ_(MS)-SST_(MS) coupling has little effect on improving the simulation of the Kuroshio Current system.     

逆方法计算一致性问题的一个案例研究

逆方法是海洋学研究中一个常用的方法,但是所求解的统计量通常和模式的先验假设不一致。为了解决这一问题,本文尝试将所求解的统计量作为模式的先验统计量,然后进行下一轮求逆运算,并重复这一过程。通过分析一个具体的案例,发现经过数次迭代之后,由于解和模式误差的协方差矩阵的行列式会变为零,从而所求解的统计量和它的先验假设之间的一致性变得很难评估。然而,在迭代过程中,解的后验统计量和先验统计量之间的数值上差异能够逐渐缩小。