我國江淮地區(qū)平均場(chǎng)水汽輸送與擾動(dòng)場(chǎng)水汽輸送的不同特征

doi:10.3969/2012jms.00**

首頁 > 過刊瀏覽>2007年第卷第2期 >155-161. DOI:10.3969/2012jms.00**

我國江淮地區(qū)平均場(chǎng)水汽輸送與擾動(dòng)場(chǎng)水汽輸送的不同特征
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P462
基金項(xiàng)目:國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃);江蘇省氣象科學(xué)研究所研究基金共同資助項(xiàng)目

CHARACTERISTICS OF WATER VAPOR TRANSPORT IN AVERAGED FIELD AND ITS DIFFERENCE FROM THAT IN DISTURBED FIELD IN CHANGJIANG AND HUAIHE VALLEYS

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利用NCEP／NCAR1957-2001年45a逐日的再分析資料，從地面開始積分計(jì)算整層的水汽輸送通量，減去平均場(chǎng)的水汽的輸送量，從而得到擾動(dòng)水汽輸送量，初步討論了我國江淮地區(qū)水汽輸送場(chǎng)的季節(jié)變化特征，并分析了我國江淮梅雨期旱、澇年平均場(chǎng)水汽輸送與擾動(dòng)場(chǎng)水汽輸送的差異。分析發(fā)現(xiàn)：擾動(dòng)場(chǎng)水汽輸送與平均場(chǎng)水汽輸送差別較大，源自孟加拉灣的平均水汽輸送對(duì)我國東部地區(qū)的降水影響較大，但該地區(qū)的擾動(dòng)水汽輸送卻主要是影響印度北部地區(qū)。而影響我國江淮地區(qū)的擾動(dòng)場(chǎng)水汽輸送主要來自于南海地區(qū)。源自西太平洋和我國北方的偏強(qiáng)的水汽輸送是造成江淮梅雨期降水偏多的主要因子，擾動(dòng)場(chǎng)水汽輸送在我國江淮地區(qū)梅雨期降水異常時(shí)期與平均場(chǎng)水汽輸送基本呈反方向輸送，其差值散度場(chǎng)與平均場(chǎng)水汽輸送差值散度則為反位相分布，因此說擾動(dòng)場(chǎng)的水汽輸送對(duì)平均場(chǎng)的水汽輸送起削弱作用。

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In this paper,the NCEP/NCAR reanalysis data and the disturbance flux field of water vapor transport (the integration of whole atmospheric column above the ground minus its mean field) are used to analyze the seasonal variation of water vapor transport over the Changjiang and Huaihe River Valleys for the 1957-2001 period. Differences of moisture transfer during the Meiyu period between the droughts and floods years are also investigated. Results show that there are great differences between the mean vapor transfer field and the disturbance one. The mean water vapor transport from the Bay of Bengal greatly influences the precipitation in the eastern China,while the disturbance one from the same source exerts primary impacts on the district of the northern Indian. The disturbance moisture transport which affects the Changjiang and Huaihe Valleys is mainly from the South China Sea. The key factor responsible for positive precipitation anomaly over Changjiang and Huaihe Valleys is the intense moisture transport from both the western Pacific Ocean and the northern China .It is also revealed that disturbance water vapor transport weakens the mean one,because the disturbance transport direction is opposite to the climatologic mean and the divergence of disturbance field manifesting is out of phase compared with the mean one during the anomalous Meiyu rainfall period over Changjiang and Huaihe Valleys.

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朱瑋,劉蕓蕓,何金海.我國江淮地區(qū)平均場(chǎng)水汽輸送與擾動(dòng)場(chǎng)水汽輸送的不同特征.氣象科學(xué),2007,(2):155-161 Zhu Wei, Liu Yunyun, He Jinhai. CHARACTERISTICS OF WATER VAPOR TRANSPORT IN AVERAGED FIELD AND ITS DIFFERENCE FROM THAT IN DISTURBED FIELD IN CHANGJIANG AND HUAIHE VALLEYS. Journal of the Meteorological Sciences,2007,(2):155-161

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