本論文探討南太平洋上空副熱帶地區之200百帕風速極大值及其隨時間變化之波譜結構，其中時間以1986年11月至1987年4月為原則。首先經由扣除30天滑動平均後可得距平場，以波譜分析發現此距平場呈現9至13天週期振盪。然而透過進一步波譜結構分析後發現此週期性緯向風速變化和中緯度槽╱脊系統有密切關係。

　　　　　The 200 hPa zonal wind maxima were analyzed over the South Pacific area during November 1986∼April 1987. The anomalies were computed by removing the 30day running means and spectral methods were applied to these anomalies. The FFT of the wind maxima revealed spectral peaks of 9 and 13 days. Variance analyses implied mid-latitude forcings could play a role. However, the 200 hPa height fields to the poleward side of the wind maxima showed similar periodic oscillations. Results of further analyses indicated the quasi-periodic wind maxima could be related to mid-latitude trough/ridge systems.