江淮流域夏季持續(xù)性強降水的低頻特征分析

doi:10.3969/2012jms.0165

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江淮流域夏季持續(xù)性強降水的低頻特征分析
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                        10.3969/2012jms.0165
                    
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基金項目:國家重點基礎研究發(fā)展計劃(973計劃)項目(2012CB417203);公益性行業(yè)(氣象)科研專項(GYHY201106017);國家科技支撐計劃項目(2009BAC51B01);江蘇高校優(yōu)勢學科建設工程資助項目

Low-frequency oscillations of persistent heavy rainfall over Yangtze-Huaihe River Basin

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利用1979—2009年夏季(6—8月)中國氣象觀測站點逐日降水資料、NCEP/NCAR的再分析資料以及向外長波輻射資料等,選取低頻降水事件來表征江淮流域夏季持續(xù)性強降水,然后分析其基本特征及伴隨的低頻大氣環(huán)流形勢,利用位相合成的方法對該低頻信號的來源和傳播特征進行研究。結果表明:江淮流域夏季持續(xù)性強降水在6—7月份發(fā)生次數(shù)較多;在持續(xù)性強降水期間,江淮流域低層受低頻氣旋控制,南海至菲律賓海一帶則是很強的低頻反氣旋,該低頻反氣旋西側,向北的低頻水汽輸送將水汽不斷送至江淮流域形成輻合;與持續(xù)性強降水相關聯(lián)的850 hPa上的低頻信號,來源于黃河河套地區(qū)低頻振蕩的東南向傳播和西北太平洋上空低頻振蕩的西北向傳播;在高層,當持續(xù)性強降水發(fā)生時,江淮流域的西北側(37.5 °N,80~100 °E)附近為強烈的低頻氣旋式環(huán)流,緊鄰該環(huán)流的西北側,則是一個低頻反氣旋,兩者同南?！坡少e海一帶的低頻反氣旋構成了一個西北—東南向的低頻波列;西太平洋副熱帶高壓和南亞高壓在持續(xù)性強降水期間表現(xiàn)出了顯著的相向而行、相背而去的特征。

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Using daily rainfall data in China, outgoing long wave radiation(OLR) data and NCEP/NCAR reanalysis dataset from June to August during 1979—2009, this paper first characterizes summer persistent heavy rain over Yangtze-Huaihe River Basin (YHB) through selecting rain events of low frequency, then analyzes its low frequency oscillation and accompanied low frequency circulation condition. The source and propagation of the low-frequency signals are also investigated by phase-composite method. Results show that the summer persistent heavy rain over YHB occurs frequently in June and July. Accompanied with the persistent heavy rain, a low frequency cyclone influences the YHB while a strong low frequency anticyclone affects region from the South China Sea (SCS) to Philippines Sea (PS) in the lower troposphere. The water vapor transportation in the west of the low frequency anticyclone brings water vapor to YHB. Both the southeast propagation of low frequency oscillation over the loop of Yellow River and the northwest one over the northwestern Pacific at 850 hPa are two dominant signals of low frequency circulation associated with persistent heavy rain. In the upper troposphere, when the persistent heavy rain occurs a strong low frequency cyclone locates over the northwest of YHB centered around 80-100 °E,37.5 °N, close to which a low frequency anticyclone appeas. Thus, a low frequency wave train is formed from northwest China to the SCS and PS region. Before the peak of persistent heavy rain, the western Pacific subtropical high and the south Asia high begin to approach each other, then they tend to departure each other gradually after the peak.

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曹鑫,任雪娟,孫旭光.江淮流域夏季持續(xù)性強降水的低頻特征分析.氣象科學,2013,33(4):362-370 CAO Xin, REN Xuejuan, SUN Xuguang. Low-frequency oscillations of persistent heavy rainfall over Yangtze-Huaihe River Basin. Journal of the Meteorological Sciences,2013,33(4):362-370

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收稿日期:2012-04-23
最后修改日期:2012-09-14
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在線發(fā)布日期: 2013-09-06
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