冬季東亞高空副熱帶急流和溫帶急流協(xié)同變化與中國南方地區(qū)降水的關系

doi:10.3969/2015jms.0083

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冬季東亞高空副熱帶急流和溫帶急流協(xié)同變化與中國南方地區(qū)降水的關系
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                        10.3969/2015jms.0083
                    
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基金項目:國家自然科學基金重點資助項目(41130963)

Relationship between concurrent variation of the East Asian jet streams and precipitation in winter over South China

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利用NCEP/NCAR再分析數(shù)據和中國臺站降水資料研究冬季東亞高空副熱帶急流和溫帶急流協(xié)同變化特征及其與中國南方地區(qū)降水的關系,發(fā)現(xiàn)冬季東亞高原急流與溫帶急流同期反向協(xié)同變化特征最為顯著。即高原急流增強,同時溫帶急流減弱(SW型)和高原急流減弱,同時溫帶急流增強(WS型)。當高原急流增強(減弱)而溫帶急流減弱(增強)時,中國南方地區(qū)降水顯著增加(減少)。合成分析表明,不同急流協(xié)同變化型態(tài)下冷暖空氣活動特征存在較大差異,高原急流與溫帶急流的反向協(xié)同變化可以真實反映與冬季中國南方地區(qū)降水相關聯(lián)的冷暖空氣活動特征,進而導致不同降水形態(tài)的產生。

Abstract:

Based on the NCEP/NCAR reanalysis and observation precipitation data, the concurrent variation feature of the East Asian subtropical jet and polar front jet, as well as its association with the precipitation in winter over South China, were examined. It was found that the simultaneous reverse concurrent variation between the East Asian plateau jet and polar front jet was the most remarkable in winter. There exist two types of variation:the plateau jet was strong while the polar front jet was weak(SW), and the plateau jet was weak while the polar front jet was strong(WS). When the plateau jet was intensified(weakened) while the polar jet was weakened(intensified), the precipitation over South China was increased(decreased) significantly. Composite analysis results show that the reverse concurrent variation between the plateau jet and the polar front jet can reflect the activity features of cold and warm air associated with precipitation in winter, leading to the different precipitation pattern over South China.

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聶鋒,廖治杰,徐勇.冬季東亞高空副熱帶急流和溫帶急流協(xié)同變化與中國南方地區(qū)降水的關系.氣象科學,2016,36(1):20-27 NIE Feng, LIAO Zhijie, XU Yong. Relationship between concurrent variation of the East Asian jet streams and precipitation in winter over South China. Journal of the Meteorological Sciences,2016,36(1):20-27

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收稿日期:2014-09-30
最后修改日期:2014-11-04
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在線發(fā)布日期: 2016-04-11
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