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| 題 名 | Noah地表模式於中央氣象局全球預報系統的應用評估與調整=Assessment and Adjustment of the Noah Land Surface Model Applied to the CWB Global Forecast System |
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| 作 者 | 汪鳳如; 馮欽賜; | 書刊名 | 氣象學報 |
| 卷 期 | 51:1 2014.07[民103.07] |
| 頁 次 | 頁25-40 |
| 分類號 | 328.88 |
| 關鍵詞 | 地表模式; 可感熱; 地表能量收支; Land surface model; Sensible heat flux; Surface energy budget; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本研究針對氣象局全球預報系統引進之 Noah地表模式進行評估及調整測試,第一階段初步評估測試顯示,Noah地表模式對模式低層大氣有普遍增溫的影響,此影響雖然減緩了冬季原有的冷偏差,但對於夏季原本已過暖的低層大氣,則有增強暖偏差的負面影響。參考 EC-interim重分析資料對模式地表能量收支進行之診斷,顯示於夏季地表至大氣的平均可感熱與潛熱比值偏大,此問題本已存在於作業模式,但 Noah地表模式使得此問題更為明顯,因此本研究第二階段規劃了二個方向調整,試圖調降可感熱與潛熱比值,進而改善夏季低層大氣之暖偏差現象。另外,也測試了模式預報結果對土壤濕度初始場的敏感度,發現設定適當的土壤濕度場對Noah地表模式的表現有相當的提升效果。 |
| 英文摘要 | In this study, tests for assessment and adjustment of the Noah land surface model which is introduced from NCEP GFS to CWB GFS are performed. Based on the preliminary results of the assessment, a warmer tendency extensively comes up over ground level and lower atmosphere both for summer and winter. Although which would reduce the existing cold bias for winters, it further intensifies the warm bias in summer as well. Through referring to diagnoses of surface energy budget with EC-interim reanalysis, it shows the overestimation problem of Bowen Ratio (sensible heat/latent heat) exists in summer and would deteriorate while Noah land surface model is applied. Thus two approaches are put into adjustment test intending to decrease Bowen Ratio and then the warm bias in lower layers of atmosphere. Sensitivity test of initial soil moisture is also implemented in this study. |
本系統中英文摘要資訊取自各篇刊載內容。