台湾东北海域冷涡-上升流系统冬、夏季温度三维结构

Three-dimension temperature structure of cold eddy-upwelling system off northeastern Taiwan Island in summer and winter

利用美国国家海洋大气管理局(NOAA)2007年发布的全球海域温度多年月平均数据库资料(WOA 05),研发计算机数值分析和图形可视技术,对台湾东北海域冬、夏季的温度分布进行数值分析,展示台湾东北海域冷涡-上升流系统冬、夏季温度分布的三维结构,分析黑潮、台湾暖流以及东海陆架水的影响,得出以下结论。(1)夏季(8月)冷涡主要存在于13—100m深度以及138—150m深度;冬季(2月)冷涡主要存在于109—150m深度之间。(2)夏季(8月)上升流的拱形结构从表层向下都存在,其中由于台湾暖流与东海陆架底层水的影响,造成在深度100—138m之间的等温线不闭合;冬季(2月)上升流的拱形结构主要存在于100m水深以下。(3)在黑潮向西北方向入侵东海陆架的区域,冷涡-上升流系统消失。在冷涡-上升流系统作用的区域,黑潮向东北方向入侵东海陆架的程度越强,冷涡-上升流系统的势力也越强。

With the research and development of Matlab computer programs about data analysis and figure manifestation, three dimensional temperature structures of the cold eddy - upwelling system off the northeastern Taiwan Island in summer and winter are displayed and studied based on the World Ocean Atlas 2005, and the influences of Kuroshio, the Taiwan Warm Current and the continental shelf current in the cold eddy - upwelling system are analyzed. The results are as follows. （1） In August, the cold eddy is divided into the upper and the bottom parts; In February, the cold eddy only exists in the water layer between 109m and 150m. （2） The upwelling in the center of the cold eddy is continuous, but the isotherm in token of the cold eddy is not close between 100m and 138m because of the wedging effect of the bottom colder water from the shelf of the East China Sea and the warmer water from the bottom of the Taiwan Strait. （3） In the region where Kuroshio intrudes northwestward into the continental shelf of the East China Sea, the cold eddy - upwelling system becomes weaker or disappears. The cold eddy - upwelling system becomes stronger in the layer where Kuroshio intrudes northeastward into the shelf.