FUNDAMENTAL RESEARCH ON DATA ASSIMILATION FOR NUMERICAL OCEAN MODEL

建立了北太平洋的正压模式。分析了海面风场资料，包括船舶观测资料、卫星资料和模式分析资料。这两个卫星风数据，GEOSAT/ALT和DMSP/SSMI，非常相似。另一方面，船舶观测风强于卫星风，而分析风弱于卫星风。正压模型是由这些风驱动的。结果表明，正压模式中的黑潮输运在很大程度上取决于驱动模式的风。我们研究了两种从Tike系列SST图像估计表面速度的方法。我们证明了我们可以通过逆方法精确地估计出交叉ITHOTHERM分量。加入散度最小化后，该模型产生了扰动速度的沿等温线分量。将逐次改正方法应用于卫星风场数据，建立了最优风场数据集。得到的风速与海洋浮标测量的风速非常吻合。

A BAROTROPIC MODEL OF THE NORTH PACIFIC HAS BEEN DEVELOPED. SEA SURFACE WIND DATA WHICH ARE SHIP OBSERVATION DATA, SATELLITE DATA AND MODEL ANALYSIS DATA HAS BEEN ANALYZED. BOTH SATELLITE WIND DATA, GEOSAT/ALT AND DMSP/SSMI, ARE QUITE SIMILAR. ON THE OTHER HAND, SHIP OBSERVATION WINDS ARE STRONGER THAN SATELLITE WINDS, WHILE ANALYSIS WINDS ARE WEAKER THAN SATELLITE WINDS. THE BAROTROPIC MODEL HAS BEEN DRIVED BY THOSE WINDS. IT IS CONCLUDED THAT THE KUROSHIO TRANSPORT IN THE BAROTROPIC MODEL LARGELY VARIES DEPENDING ON WHAT WIND DRIVES THE MODEL. WE EXAMINED TWO METHODS ESTIMATING SURFACE VELOCITY FROM TIKE SERIES OF SST IMAGES. WE SHOWED THAT WE CAN EXACTLY ESTIMATE THE CROSS-ITHOTHERM COMPONENT BY AN INVERSE METHOD. WITH THE ADDITION OF MINIMIZATION OF DIVERGENCE, THE MODEL PRODUCES THE ALONG-ISOTHERM COMPONENT OF THE PERTURBATION VELOCITY. CONSTRUCTION OF THE OPTIMUM WIND DATA SET IS DONE BY APPLYING THE SUCCESSIVE CORRECTION METHOD TO SATELLITE WIND DATA. OBTAINED WIND SPEEDS REMARKABLY AGREE WITH WIND SPEEDS MEASURED BY OCEAN BUOYS.