近30 a福建省前汛期極端降水事件特征及其成因

doi:10.3969/2015jms.0082

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近30 a福建省前汛期極端降水事件特征及其成因
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                        10.3969/2015jms.0082
                    
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基金項目:公益性行業(yè)(氣象)科研專項(GYHY201406024)和國家自然科學(xué)基金重點資助項目(41330425)

Characteristics and causes of extreme precipitation events over Fujian province during May and June in recent three decades

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利用1981-2010年前汛期(5-6月)福建地區(qū)臺站逐日降水觀測資料及NCEP/NCAR再分析逐日資料,對福建地區(qū)極端降水事件發(fā)生規(guī)律及環(huán)流異常進行了分析。結(jié)果表明:近30 a福建地區(qū)前汛期各站極端降水事件的發(fā)生頻次在40~62次之間,沿海臺站發(fā)生次數(shù)明顯少于內(nèi)陸臺站。區(qū)域性極端降水發(fā)生頻次亦呈顯著增加趨勢,增幅為0.06次/a,且在1994年后,前汛期極端降水事件的發(fā)生頻次明顯增多。區(qū)域性極端降水86次事件平均的降水分布顯示在閩西中部降水量最大,并由此向外圍逐漸減小。極端降水事件對前汛期降水貢獻較大,約占前汛期總降水量的兩成以上。極端降水事件的發(fā)生與大氣環(huán)流異常存在密切關(guān)系,對深刻認識福建地區(qū)極端降水事件的形成機制和變化規(guī)律具有重要意義。

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By using daily precipitation data in pre-flood(May to June) period in Fujian province and NCEP/NCAR daily reanalysis data from 1981 to 2010 the characteristics and causes of the extreme precipitation events over Fujian province are investigated. Results show that there have been 40-62 extreme precipitation events occurred at different stations during pre-flood period in Fujian in recent 30 years. The events occurrences in coastal area are obviously less than those in inland area. The occurrences of regional extreme precipitation events increase obviously with a tendency of 6 times per decade. Particularly in the period after 1994, the occurrences of regional extreme precipitation during pre-flood period are significantly more than in the period before 1994. The central area of western Fujian has the largest mean regional extreme precipitation events. The total precipitation due to the extreme events contributes more than 20% to the total rainfall during pre-flood period. The occurrences of extreme precipitation events are induced by the anomalies of atmosphere circulations, which are beneficial to better understand the mechanisms of extreme precipitation events and to find clues to predict these extreme events.

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劉靜,管兆勇,龔振彬,陳艷蝶.近30 a福建省前汛期極端降水事件特征及其成因.氣象科學(xué),2016,36(1):28-35 LIU Jing, GUAN Zhaoyong, GONG Zhenbin, CHEN Yandie. Characteristics and causes of extreme precipitation events over Fujian province during May and June in recent three decades. Journal of the Meteorological Sciences,2016,36(1):28-35

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收稿日期:2015-09-25
最后修改日期:2015-10-24
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在線發(fā)布日期: 2016-04-11
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