5月南亞高壓與云南地區(qū)夏季降水的關(guān)系

doi:10.3969/2014jms.0025

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5月南亞高壓與云南地區(qū)夏季降水的關(guān)系
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                        10.3969/2014jms.0025
                    
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基金項(xiàng)目:國家科技支撐計(jì)劃項(xiàng)目（2012BAH05B01）；江蘇省高校自然科學(xué)研究面上項(xiàng)目（11KJB170006）；北極閣基金（BJG201102）

Relationship between South Asia High in May and summer rainfall in Yunnan

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應(yīng)用1961-2012年NCEP/NCAR月平均再分析資料和云南124個(gè)測(cè)站逐月降水資料，分析了5月南亞高壓與云南夏季降水的關(guān)系，發(fā)現(xiàn)高壓脊線位置與降水有顯著的相關(guān)。利用濾波處理和合成分析方法，分析了5月南亞高壓脊線位置變化及其異常與云南夏季降水異常的聯(lián)系。結(jié)果表明：5月南亞高壓脊線位置偏北（南）時(shí)，夏季云南降水偏多（少）；5月南亞高壓脊線位置和云南夏季降水都存在顯著的年代際變化，去除年代際變化影響之后兩者之間的年際變化相關(guān)較為顯著。5月南亞高壓脊線位置偏北年，夏季南亞高壓強(qiáng)度偏弱、范圍偏小，500 hPa上西太平洋副高東移南壓、強(qiáng)度減弱。低層700 hPa上副高西伸加強(qiáng)、云南上空出現(xiàn)明顯的風(fēng)場(chǎng)輻合，反之亦然。5月脊線位置偏北年，夏季南海和西太平洋向云南輸送水汽，脊線偏南年沒有明顯的水汽來源。

Abstract:

Based on the NCEP/NCAR monthly reanalysis data and monthly rainfall data from 124 stations in Yunnan during 1961-2012, correlations between the South Asia High (SAH)in May and summer rainfall in Yunnan are analyzed, which found that a significant correlation exists between the position of ridge line and rainfall. With filtering and synthetic analysis methods, the linkage of the position variation and anomaly of ridge line of SAH in May with summer rainfall anomaly in Yunnan is analyzed. The results show that when the ridge line position of SAH in May locates northward (southward), the summer rainfall in Yunnan is more (less);both the ridge line position of SAH in May and summer rainfall in Yunnan have significant inter-decadal variation, removing which, their inter-annual variation correlation would be more obvious. During the northerly-location years of the ridge line position of SAH in May, its intensity and range become weaker and smaller, the West Pacific Subtropical High at 500hPa moves southeastward and becomes weaker, the subtropical high at 700hPa at low level moves westward and becomes stronger, and the significant wind convergence appears above Yunnan, and vice versa. Furthermore,in the northerly-location years, the vapor from the South Sea and the West Pacific transports to Yunnan in summer, while in the southerly-location years, no obvious vapor transportation occurs.

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郭志榮,江燕如,彭麗霞,董麗娜.5月南亞高壓與云南地區(qū)夏季降水的關(guān)系.氣象科學(xué),2014,34(4):397-403 GUO Zhirong, JIANG Yanru, PENG Lixia, DONG Lina. Relationship between South Asia High in May and summer rainfall in Yunnan. Journal of the Meteorological Sciences,2014,34(4):397-403

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收稿日期:2013-12-20
最后修改日期:2014-02-25
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在線發(fā)布日期: 2014-08-29
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