研究生: |
陳盈靜 |
---|---|
論文名稱: |
ECHAM4 模式T42系集模擬與T106模擬季內振盪之比較 |
指導教授: |
鄒治華
Tsou, Chih-Hua 陳正達 Chen, Cheng-Ta |
學位類別: |
碩士 Master |
系所名稱: |
地球科學系 Department of Earth Sciences |
論文出版年: | 2006 |
畢業學年度: | 94 |
語文別: | 中文 |
論文頁數: | 56 |
中文關鍵詞: | ECHAM4 、季風 、季內振盪 |
論文種類: | 學術論文 |
相關次數: | 點閱:230 下載:5 |
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亞洲夏季季風的活躍與暫歇受季內振盪(ISO,Intraseasonal Oscillation)的影響很大,因此若能改善ISO的預報,將有助於亞洲季風之預報。本研究採用ECHAM4 T42及T106(European Centre,Hamburg)模式之日降雨值進行ISO評估。分析結果顯示,ECHAM4 T42模擬,無論是氣候模擬或是各年模擬,至五月份相關係數都下降,到了七、八月回升。五月份模擬變差的時間與對流往北移動的時間相符,而運用ECHAM T106模擬後,可使模擬結果變得更好,但五月份的空間相關係數仍較其他月份低。T42模式透過傳統系集平均,可有效增加模擬結果,無論是氣候模擬或是年際變化,十個模擬之傳統系集平均與五個模擬之傳統系集平均結果相差不多;運用系集模擬之後,無論在在訓練時間(training period)及預報時間(forecast period),系集模擬比單一模擬要好,透過統計回歸模擬又較傳統平均系集模擬佳,且透過統計回歸模擬,五月模擬較其他月份差的現象可獲得改善。
五月份30~60天降雨與赤道東太平洋、印度洋SST呈正相關,與熱帶西太平洋SST有呈負相關;模式對SST年際變化之反應與觀測相似,當東太平洋SST偏暖,西太平洋SST偏冷,在西太平洋地區30~60天振盪位置偏南,然而在模擬較差年時,在西太平洋地區30~60天振盪位置,較觀測位置偏北,降雨預報較觀測差;此外無論是模擬較佳年或是模擬較差年,印度洋地區預報均偏北;經過統計回歸方式調整後,對西太平洋地區及印度洋地區預報均有改善。
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