Intraseasonal variability in the upper layer currents observed in the eastern equatorial Indian Ocean
Intraseasonal variability in the upper layer currents observed in the eastern equatorial Indian Ocean
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DOI：
10.1029/2004gl021896
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发表时间：
2005-01
影响因子：
5.2
通讯作者：
Y. Masumoto;H. Hase;Y. Kuroda;H. Matsuura;K. Takeuchi
中科院分区：
文献类型：
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作者：
Y. Masumoto;H. Hase;Y. Kuroda;H. Matsuura;K. Takeuchi
利用声学多普勒海流剖面仪于2000年11月至2001年10月在90°E赤道对赤道东印度洋上层海流进行了直接观测，结果表明，上层纬向流和经向流的主要变化周期分别为30~50天和10~20天的季节内频带。纬向流强烈的季节内变化掩盖了半年一次的Wyrtki急流，这在月平均场中可以清楚地看到。此外，还观察到了纬向流的强垂直切变区和具有明显半年周期的赤道潜流。这些结果为我们提供了一个新的视角来认识赤道东印度洋能量季节内变率的重要性，这表明它与系泊位置附近的风变率有很强的相关性。
Direct observations of the upper ocean velocity in the eastern equatorial Indian Ocean by an acoustic Doppler current profiler, from November 2000 to October 2001 on the equator at 90°E, demonstrate that the dominant periods of variability in the upper layer zonal and meridional currents are in intraseasonal frequency bands with periods of 30 to 50 days and 10 to 20 days, respectively. The strong intraseasonal variability in the zonal current obscures the semiannual Wyrtki jets, which can be seen clearly in the monthly averaged field. In addition, a zone of strong vertical shear of the zonal current and a distinct Equatorial Undercurrent with semiannual period are observed. The results provide us with a new perspective on importance of the energetic intraseasonal variability in the eastern equatorial Indian Ocean, which indicates strong correlation with the wind variability near the mooring location.