基于WOA13数据对亚南极锋的季节变化特征研究

Study on the Seasonal Variation Characteristics of the Sub-Antarctic Front Based on WOA13 Data

海洋锋深刻反映着海洋环境要素的变化,研究海洋锋对渔业和水下声学的应用有着重要的参考价值。WOA13是一种平均格点化数据,对于研究海洋锋季节变化特征有着很好的优势。文中利用WOA13季节平均温度数据,选取0.25经纬度网格数据,对南极洲亚极地锋进行了季节变化特征研究。以绝对梯度的最大值连线画出锋线具体位置,对比不同季节断面T-D分布图的差异,得到了亚极地锋的锋面结构、强度等季节变化信息。

Ocean fronts deeply reflect the variation of marine environmental factors, which have great research value for marine fishery development and underwater acoustic applications. WOA13 is a kind of averaged grid data advantageous in acquiring the seasonal variation characteristics of ocean fronts. This paper uses the WOA13 mean seasonal data and selects 0.25 degree grid data to study the seasonal variation characteristics of the Sub- Antarctic Front （SAF）. The front location is derived by connecting the maximal values of absolute gradient, so as to compare the differences in the T-D distributing images of different seasons, and finally obtain the seasonal variations of the structure and intensity of the Sub-Antarctic Front.