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中文摘要：
ENSO强度的影响因子是一个具有争议性的问题。作者探讨了一种理想的赤道高频纬向风强迫对ENSO强度的影响。将该问题转化为一类关于模式参数扰动的非线性最优化问题;基于所用的理论ENSO模式,研究了赤道高频纬向风强迫在调制ENSO强度中的角色。结果表明,对于El Nio和La Nia事件,存在两类外强迫,一类促进El Nio事件的发展却抑制La Nia事件的发展,另一类则抑制El Nio而促进La Nia事件的发展。这两类外强迫的主要区别在于初始相位的不同。相位决定了外强迫对ENSO事件是促进的还是抑制的,而外强迫的振幅和周期则决定了外强迫影响ENSO强度的大小。这些外强迫主要是通过海洋波动对斜温层深度的调节来影响ENSO事件的强度的。
英文摘要：
What controls ENSO amplitude remains controversial. The authors explore the effect of a kind of idealized equatorial high-frequency zonal wind forcing on ENSO amplitude. This problem is first transformed into a nonlinear optimization problem related to model parameters. Based on a theoretical ENSO model,the role of high-frequency zonal wind forcing in modulating ENSO amplitude is explored. The results show that there are two kinds of high-frequency zonal wind forcings for ENSO events,where the differences l...
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