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利用1993~2006年间的网格化高度计数据,通过经验正交函数(EOF)方法研究了北赤道流在表层分叉的变化规律.包括过去研究的季节和年际变化,研究结果发现一些较短周期的信号(6个月,4个月,3个月和2个月).除在年际时间尺度上,局地的风应力旋度可能是控制分叉纬度变化的重要原因.计算的年平均分叉纬度约为13.3°N,1月份最北在14.0°N,7月份最南在12.5°N.分叉纬度的变化幅度为1.5°,这主要是来自年信号的贡献(1.2°)和半年信号的贡献(0.3°).
Based on the data from gridded altimeters from 1993 to 2006, the EOF method was used to study the variation of surface bifurcation in the northern equatorial stream, including the seasonal and interannual variability of past studies. The results showed that some shorter (6 months, 4 months, 3 months and 2 months). In addition to the interannual time scale, the local wind stress curl may be the important reason for controlling the change of bifurcation latitude. The average bifurcation latitude is about 13.3 ° N, with the northernmost at 14.0 ° N in January and the southernmost at 12.5 ° N in July. The bifurcation latitude varies by 1.5 °, mainly due to the annual contribution (1.2 °) And half a year signal contribution (0.3 °).