哈马黑拉涡旋的季节变异研究

利用1992年1月～2006年11月期间的ECCO2海洋同化数据资料,研究了海洋上层50m平均的哈马黑拉涡旋的季节变异特征。结果表明,哈马黑拉涡旋在5月开始出现,7月达到最强,3月和4月消失,这主要取决于新几内亚沿岸流的季节变化。新几内亚沿岸流4～11月为西北向,从12月到次年的2月为东南向。随着西北向新几内亚沿岸流的增强,哈马黑拉涡旋开始出现并增强。而随着西北向新几内亚沿岸流的减弱和反向,哈马黑拉涡旋减弱并消失。同时棉兰老海流在夏季的增强也有利于哈马黑拉涡旋增强。旨在研究哈马黑拉涡旋的季节变异特征及其影响因子,为进一步探讨其垂向结构、年际变异等时空变化特征和该区域的环流特征提供研究基础。

Study on the seasonal variability of the Halmahera Eddy

In this paper, the seasonal variability of the Halmahera Eddy (HE) in the upper 50 m was investigated by using oceanic assimilation data of ECCO2 from January 1992 to November 2006. The results show that the HE first appears around May, peaks in July, and dies out in March and April of the following year, which are mainly resulted from the New Guinea Coastal Current (NGCC) seasonality driven by monsoon. The NGCC flows northwestward from April to November, while southeastward from December to next year February. The HE begins to form and intensify with the strengthening of the northwestward NGCC, but decay and disappear with the weakening and reversing of the northwestward NGCC. In summer, the Mindanao Current strengthens and enhances the HE.