華北5月降水年際變化特征及其成因

doi:10.3969/2012jms.00**

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華北5月降水年際變化特征及其成因
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                        10.3969/2012jms.00**
                    
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中圖分類號:P46
基金項目:國家自然科學基金

CHARACTERISTICS OF INTERANNUAL VARIATION OF THE MAY RAINFALL IN NORTH CHINA AND ITS REASON

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本文采用華北5月降水資料,NCEP資料以及COADS海溫資料,借助相關分析、合成分析等方法研究了華北5月降水的總體分布特征,并從總體上探討了其與海溫、大氣環(huán)流年際變化的關系及其影響機制。結果表明:華北5月降水存在年際變化特征,降水量偏少年份多于偏多的年份,降水偏少年降水量與平均值相差較小,而降水偏多年降水量與平均值相差較大;華北5月降水與(25~50°N,110~145°E)一帶大氣環(huán)流(200 hPa)的年際變化及前期低緯大氣環(huán)流的年際變化均有顯著的正相關關系;中緯度西傳Rossby波列與低緯赤道印度洋海溫的變化是引起華北5月降水年際變化的重要原因。

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In this article,based on the rainfall data over North China in May,atmospheric circulation data(NCEP)and the sea surface temperature data(SST),the methods of correlation analysis and composition analysis are used to study total,spatial and temporal distribution characteristics of the rainfall in May over North China,investigate correlation with interannual variation of sea surface temperature and atmospheric circulation ,and analyse mechanism of influence.It indicates:there is interannual variable characteristics of the rainfall in May,the years of less rainfall are far more than that of more rainfall.There is less difference between the rainfall of the years of less rainfall and average value,whereas there is more difference between the rainfall of the years of more rainfall and average value.There is significant positive correlation between interannual variation of atmospheric circulation(200 hPa) in area （25～50 °N，110～145 °E） and that of the rainfall in May.There is significant positive correlation between interannual variation of former low level atmospheric circulation and that of the rainfall in May.The variation of the Rossby wave moving westward in the middle latitude and Equatorial Indian Ocean are the important causes of interannual variation of the rainfall in May over North China.

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王建波,張?zhí)K平,李春,姚圣賢.華北5月降水年際變化特征及其成因.氣象科學,2006,(4):405-411 Wang Jianbo, Zhang Suping, Li Chun, Yao Shengxian. CHARACTERISTICS OF INTERANNUAL VARIATION OF THE MAY RAINFALL IN NORTH CHINA AND ITS REASON. Journal of the Meteorological Sciences,2006,(4):405-411

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