基于高分辨率高度计沿轨数据吕宋海峡亚中尺度过程季节波动分析

Seasonal fluctuation analysis on sub-mesoscale process based on high resolution along-tract data in Luson Strait

亚中尺度过程是指海洋流场罗斯贝数接近于1,空间尺度量级1km、时间尺度量级1d的动力学过程.根据高分辨率的Jason-2卫星高度计沿轨数据,采用改进的方差归一化方法,结合一维功率谱斜率分析,对南海吕宋海峡海域亚中尺度过程进行季节性统计,结果表明:吕宋海峡亚中尺度过程季节高发月份特性与相应的海平面异常波动特性较为一致性,较大的月份主要出现在秋冬季节,夏季波动相对较弱.结合当前研究和实例观测,冬季黑潮入侵和两侧"波动高能区"涡流波动是亚中尺度高发的诱因.

Sub-mesoscale process is characterized by Rossby number close to 1,1km spatial scale magnitude and 1day time scale magnitude. Based on high resolution Jason-2 satellite altimeter data and improved variance normalization and one dimension power spectrum analysis method,statistical analysis on Luzon Strait sub-mesoscale process with seasonal fluctuation characteristics is performed. The results show that the Luzon Strait sea level anomaly（ SLA） fluctuation is strong in autumn and winter and it is relatively weak in summer. Identification results based on the power spectrum curve of the along-tract data shows that the corresponding seasonal fluctuation characteristics tallies with the SLA seasonal fluctuation. Finally,it is concluded that,combined with current research and case observations,high incidence of sub-mesoscale process in Luzon Strait may be the result of winter Kuroshio intrusions and the ＂volatility high-energy zone＂on the both sides of Luzon Strait.