西北太平洋OSUMSS95平均海面模型改正量的分布规律及其解释

Distribution of the corrections to OSUMSS95 mean sea surface model in the Northwest Pacific

利用十年的T/P数据求得OSUMSS95在西北太平洋海域的改正量,其三维分布图表现出较强的规律性,高值区的位置与北赤道流、北赤道逆流、副热带逆流和黑潮的位置相吻合,这与大尺度的洋流存在着复杂的变化,包括位置、流速、流量、分支数、内核数等的变化有关。结合平均海平面的概念,提出平均海平面应有历元的概念,即由一定时间跨度的数据计算的平均海平面只有该时间跨度内的"平均"意义。

Based on the ten years of T/P altimetry data,the distribution of the corrections to the OSUMSS95 mean sea surface model in the Northwest Pacific is obtained.The three-dimensional figure shows obvious regularity,in which the locations of large magnitude corrections are in accordance with the locations of the North Equatorial Current(NEC),North Equatorial Countercurrent(NECC),Subtropical Countercurrent(SCC) and Kuroshio,which is related to the complex variety of these circulations including the variety of velocity,volume transport,the number of branches and current cores.With the conception of the Mean sea surface(MSS),it is suggested that the MSS should have the conception of epoch,which means that any MSS model obtained from a duration observation refers to a specific epoch.