| Summary: | 碩士 === 中國文化大學 === 地學研究所 === 93 === In recent years, a lot of climatic disasters have happened in the whole world. To understand whether the rainfall in Taiwan was influenced by climate change or not, this thesis analyzed the trends of the number of rainy days (NRDs) and the natural cycle of NRDs in Taiwan. The NRDs data from 1900 to 2000 of Taipei , Taichung , Tainan , Taitung and Hengchun provided by Central Weather Bureau was analyzed by the regression model and spectral analysis. The results showed that the trends of NRDs of 0.1mm and 1.0mm in Taiwan for the past century decreased significantly (p<0.05), and the trends of NRDs of other parameters were not significant. For the past 40 years, the trends of NRDs of 10mm and 50mm in Taipei increased significantly (p<0.05), and the trends of NRDs of 0.1mm in Taitung and Hengchun decreased significantly (p<0.05). The significant natural cycles of the different periodicities of rainy days in most Taiwan are 2.2-2.8 yrs and 3-8 yrs. These results might be affected by QBO(Quasi-Biennial Oscillation) and ENSO.
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