作　　者： ; ; ; ;

机构地区： 中山大学地理科学与规划学院

出　　处： 《热带海洋学报》 2016年第5期1-9,共9页

摘　　要： 以2006—2013年卫星遥感海表温度资料(GHRSST SST)为基础,通过数字图像处理的边缘检测方法提取温度锋面的核心位置,分析了琼东、粤西海域海表温度锋位置及强度的季节变化和年际变化特征,并进一步结合海面高度异常资料和海面风场资料探讨了温度锋变化的可能机制。分析结果表明,琼东、粤西海域温度锋的空间分布及锋面强度存在显著的季节变化,沿岸风应力是影响该海域锋面变化的主要动力因素。夏季温度锋面主要分布于琼东沿岸的东部及南部海域近岸50m到100m等深线之间,而冬季则主要分布在琼东的东部海域和粤西沿岸20m到100m等深线之间,春秋两季为其过渡季节;锋面强度的季节变化表现为冬季最强,春季、夏季次之,秋季最弱,其冬季锋面强度平均值可达到3℃?100km–1,夏季为1.7℃?100km–1;同时,锋面核心位置及强度的分析结果表明,琼东和粤西海域温度锋也存在较强的年际变化。 The seasonal and interannual variation of sea surface temperature (SST) fronts off the east coast of Hainan Islandand the west coast of Guangdong are investigated by detecting their intensities and central positions using 8-year (2006?2013)GHRSST data and edge detection methods. Potential mechanisms for their variations are then examined via correlationanalysis of sea level anomalies and sea surface winds. The results show that the spatial distribution and intensity of the SSTfronts off the east coast of Hainan Island and the west coast of Guangdong have obvious seasonal variation, which is drivenprimarily by the wind forcing. In summer, the SST fronts are located off the east and south coast of Hainan Island; in winter,they are mostly anchored in the east coast of Hainan Island and the west coast of Guangdong. The intensity of thermal frontvaries with the seasonal wind forcing, which is the strongest in winter with 3℃?100km–1 and is the weakest in fall with1.4℃?100km–1; 2.1℃?100km–1 and 1.7℃?100km–1 were recorded in spring and summer, respectively. Besides, the results from the center and intensity of SST fronts show pronounced interannual variability of these fronts off the east coast of Hainan Islandand west coast of Guangdong.

关 键 词： 琼东 粤西 温度锋 边缘检测 季节变化 年际变化

领　　域： [天文地球]