環流指標及自然週期法對臺灣冷季長期天氣預報之綜合應用

王時鼎

Recurring Weather Type Classifications by a Semi-Objective Method for Taiwan in the Cold Season

Shih-Ting Wang

Abstract

　　This study is the second part of the paper entitled “Extended weather forecasting tor Taiwan in the cold shason—upper air circulation patterns and fronts.” In this study a specific composite chart is designed, based on the Asian sector circulation index (S.C.I), the circulation patterns expressed by 500mb level characteristic contours, and the surface front positions. The recurring weather types for Taiwan are classified according to the features and characteristics of the composite charts. These types include: (1) the persistent dry and rainy weathers in Taiwan, (2) the severe polar air outbreaks, (3) the blocking situations, and (4) the prominant variations in the S.C.T from hight to low index and vice versa. In addition, we have also tried to usa Martin’s 500mb level anomaly types to Asia region, but found that were not suitable.