淮河流域典型旱澇年夏季大氣低頻振蕩特征

doi:10.3969/2012jms.00**

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淮河流域典型旱澇年夏季大氣低頻振蕩特征
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                        10.3969/2012jms.00**
                    
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中圖分類號:P448
基金項目:2007年度安徽省氣象局科技發(fā)展基金項目(KG200702)

Features of atmospheric low-frequency oscillation in serious flood and drought summers occurred over Huaihe River Basin

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摘要:

分析了淮河流域典型旱澇年夏季逐日降水的主要周期，澇年30 d以上低頻振蕩的方差貢獻大于旱年。500 hPa高度場30～60 d低頻振蕩方差貢獻大值區(qū)與持續(xù)正高度異常對應，澇年歐亞中高緯度的低頻振蕩方差貢獻大于旱年，而副熱帶、熱帶地區(qū)方差貢獻小于旱年。旱年夏季，南半球澳大利亞高壓較澇年弱，北半球低緯度地區(qū)850 hPa低頻西風和印尼附近低頻越赤道氣明顯強于澇年。澇年中國大陸沿海的低頻反氣旋位置較旱年偏南，江南、華南為低頻西南氣流控制。澇年ITCZ位于菲律賓附近，位置也比旱年偏南。旱、澇年夏季，200 hPa伊朗高原均為低頻反氣旋，南亞高壓呈伊朗高壓模態(tài)。旱年夏季，歐亞中緯度的低頻反氣旋導致南亞高壓活動偏北，而澇年夏季南亞高壓活動偏南。

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Covariance of 30-90 d oscillation is more obvious in flood summers than droughts by filtering daily rainfall through band-pass filter. Persistent anomalies of geopotential height are closely related to the areas, where low-frequency oscillation is stronger. Extratropical low-frequency oscillation covariance over Eurasia is stronger in flood summers, while its weaker in tropic and subtropics. The more vigorous low-frequency west wind at 850 hPa prevails at low latitude NH in drought summers, and cross-equatorial flow over Indonesia around 105 °E is also strengthened. In flood summers, the low-frequency anticyclone is located in Taiwan Island, more south than that in drought summers, which leads to vigorous SW flow over south China so as to significantly affect the rainfall in Huaihe River basin. Low-frequency anticyclones are also found in Iran plateau at 200 hPa both in flood and drought summers. Due to exratropical low-frequency anticyclone over Eurasia, the south Asian high acts more frequently in the north of the continent in drought summers.

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徐敏,羅連升,丁小俊.淮河流域典型旱澇年夏季大氣低頻振蕩特征.氣象科學,2010,(4):445-451 Xu Min, Luo Liansheng, Ding Xiaojun. Features of atmospheric low-frequency oscillation in serious flood and drought summers occurred over Huaihe River Basin. Journal of the Meteorological Sciences,2010,(4):445-451

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收稿日期:2009-05-12
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