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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
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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。

    致謝-----------------------------------------------------------Ⅰ 摘要-----------------------------------------------------------Ⅱ 目錄-----------------------------------------------------------Ⅳ 圖表說明-------------------------------------------------------Ⅵ 一、 前言------------------------------------------------------1 二、 資料研究及方法 2.1資料分析與濾波方法-------------------------------------4 2.2評鑑模式的方法-----------------------------------------5 2.3多重模式系集模擬線性迴歸方法---------------------------6 三、 T42與T106亞洲季風區季內振盪模擬-------------------------10 3.1 30~60天季內振盪的氣候模擬---------------------------10 3.2 30~60天季內振盪的年際模擬--------------------------11 四、 T42系集回歸與T106模擬亞洲季風區之比較-------------------14 4.1 T42傳統系集平均模擬亞洲季風區之預報------------------14 4.1.1 30~60天季內振盪的氣候模擬---------------------14 4.1.2 30~60天季內振盪的年際變化模擬-----------------16 4.2 T42與T106回歸系集模擬亞洲季風區之預報---------------17 4.3小結--------------------------------------------------20 五、 邊界條件SST對30~60天降雨季內振盪之影響------------------22 六、 結論與討論------------------------------------------------27 參考文獻-------------------------------------------------------30 附圖表---------------------------------------------------------38

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