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題 名 | 東亞與西太平洋地區中高層水氣之區域性特徵:1996年夏季=Characteristics of the Upper-Level Water Vapor in the Area of the East Asia and West Pacific:1996 Summer |
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作 者 | 潘琦; 盧孟明; | 書刊名 | 氣象學報 |
卷 期 | 42:1 1998.03[民87.03] |
頁 次 | 頁1-15 |
分類號 | 328.2 |
關鍵詞 | 水氣頻道資料; 亞洲夏季季風; Water vapor channel data; Asian summer monsoon; |
語 文 | 中文(Chinese) |
中文摘要 | 本報告對1996年夏季中高層累積水氣的區城性特徵做了簡單的分析,研究的範 圍是100°E-140°E及10°N-40°N。結果顯示,在這個區域內,最為潮濕的大氣主要是在 中南半島一帶的陸地或沿海地區;而西太平洋海面上的水氣於副高範圍內外乾濕分明,低 頻變化特別顯著。南海上的水氣分佈也甚不均勻,比較潮濕的區域位於東南部與靠菲律賓 一帶。整個東亞與西太平洋地區夏季中大氣最濕的月份是七月。根據特定區域當中的深對 流區域比例,我們定義了一個水氣指標(MI),做為判斷西太平洋季風肇始的參考。換言之 ,西太平洋夏季季風的肇始可謂是中高層大氣乾期的結束與濕期的開始。另外,延遲相關 分析結果顯示,水氣變化的固有路徑也有極明顯的區域性差異,其中海陸的分佈與太平洋 副高的特徵是最重要控制因素。最後,我們發現在整個夏季當中,按水氣的五日平均值所 顯示極端變化定義出的區域非但不零亂,且是相當規律地分佈在西太平洋與華北一帶,這 些區域應可看為是東亞與西太平洋區域夏季季內變化最為明顯的區域。 |
英文摘要 | The characteristics of the upper-level water vapor in the region within IOO'E-140'E and 1O°N- 40°N are analyzed. Our results show that within this region the wettest atmosphere is over the Indochina peninsula. Over the western Pacific, the contrast between dry and wet atmosphere is particularly clear within and without the Pacific subtropical high. The low-frequency fluctuations are particularly clear around the Pacific subtropical high. Over the South China Sea, the Water vapor distribution is far from uniform. The atmosphere is wetter near the Philippines than other part. July is the wettest month in this summer. A water vapor index, MI, is defined for identifying the onset of the western Pacific monsoon. MI is based on the ratio of deep convective area within a domain with a fixed area. It is found that the onset of the western Pacific summer monsoon can be defined as the end of the period of dry upper-level atmosphere and the beginning of the wet period. In addition, the characteristic paths of water vapor transportation revealed by lag correlation analysis suggest that the land and sea contrast be the most important controlling factor of the paths. Finally, our results show that the areas where extreme variations in water vapor tend to occur do not randomly appear in the region of analyses. Instead. the areas are well organized in the western Pacific and north China. These areas are the areas with particularly, clear intraseasonal variations in upper-level water vapor. |
本系統中英文摘要資訊取自各篇刊載內容。