研究生: |
楊玉雲 |
---|---|
論文名稱: |
地表過程參數化方法對地表能量與水汽通量模擬的影響 |
指導教授: | 陳正達 |
學位類別: |
碩士 Master |
系所名稱: |
地球科學系 Department of Earth Sciences |
畢業學年度: | 87 |
語文別: | 中文 |
論文頁數: | 79 |
中文關鍵詞: | 地表過程 |
論文種類: | 學術論文 |
相關次數: | 點閱:130 下載:0 |
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本研究利用Cabauw觀測地表資料以獨立態的方式驅動並驗證容器模式及土壤植被模式,由這兩種不同的模式在日夜變化與季節循環方面的表現,了解不同模式的特性此外,藉由模式中相關地表參數選取的敏感度實驗可釐清模式在不同參數選擇上的重要性。
由模式模擬的結果,在日夜循環方面,模式地表溫度的變化較實際觀測為晚,因此潛熱與可感熱通量的模擬與觀測值有大小時及時間上的差異,導致模式淨地表能量通量在早上時高估於觀測值,下午則低估,地表溫度的變化幅度也因此比觀測值要來的明顯。在季節變化方面,兩個模式的地表溫度分布與觀測頗為相似,冬季時模式較接近於觀測值的有效輻射溫度,越接近夏季,兩模式的地表溫度變動的差值較觀測值大。由於土壤植被模式所模擬的潛熱通量比容器模式小,可感熱通量與地表溫度則比較高。自由參數的調整使得容器模式中土壤含水量產生明顯差異,則蒸散能力與潛熱通量也因此而有所不同,土壤植被模式中土壤參數的調整使得模擬結果在蒸散大於降水與蒸散小於降水的季節中有所差別,植被參數的調整使得模擬結果的變化與太陽短波輻射強度變化的季節相似。在7月的日夜循環比較,在容器模式中自由參數的調整主要是影響土壤層的熱容量。總而言之,自由參數的調整,使得容器模式在土壤含水量有較明顯的變化,而土壤植被模式則是在蒸散能力方面確實有所影響,這對於地表溫度與能量通量的模擬產生了同樣的效應。
對於地表過程的研究,在此是將土壤植被模式與容器模式以實際觀測資料做測試,由於觀測資料中欠缺地表逕流與土壤含水量的資料,在水文過程方面的探討,無法做更詳盡的了解,期望在未來後續的研究當中,能將這一方面的問題加以排除。
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