東北冷渦下遼寧省短時強降水統(tǒng)計與合成分析

doi:10.3969/2016jms.0018

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東北冷渦下遼寧省短時強降水統(tǒng)計與合成分析
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                        10.3969/2016jms.0018
                    
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基金項目:國家重點基礎研究發(fā)展計劃“973”（2013CB430103）；國家自然科學基金資助項目（41530427，41375058）

Statistical and composite analysis on short-time heavy rainfall of Liaoning province under Northeast China cold vortex

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利用2000-2014年6-8月常規(guī)資料、FNL資料和遼寧省逐時降水資料，將東北冷渦分為北渦、中間渦和南渦，統(tǒng)計每類冷渦短時強降水特征，并進行動態(tài)合成分析。結果表明：短時強降水共755次，冷渦下227次，冷渦強降水多發(fā)生在1~3 h內。6月短時強降水主要由中間渦引起，7、8月中間渦與北渦共同影響，有一定周期變化；而南渦沒有在遼寧產生強降水。北渦水汽輸送充沛，中間渦水汽條件較差，切變輻合場與水汽輸送的結合是有利于強降水的重要因子。降水基本處于斜壓區(qū)內，冷渦中心降水處在斜壓區(qū)北側和高空急流左前方，高空槽前或槽后的降水處在斜壓區(qū)南側和急流中心右后方，降水區(qū)附近多有高空急流形成的次級環(huán)流配合。槽后降水區(qū)干侵入活動明顯，冷渦中心降水主要通過高位渦誘發(fā)氣旋性環(huán)流而觸發(fā)上升運動。

Abstract:

By using the conventional data, FNL data and hourly precipitation data in Liaoning province from June to August during 2000-2014, the Northeast China Cold Vortex(NCCV) was divided into north vortex, middle vortex, and south vortex, and the short-time heavy rainfall characteristics of each cold vortex were statistically studied and dynamically analyzed. Results show that there were 755 times of short-time heavy rainfalls, only 227 times happened under the background of NCCV during 1 to 3 hours. Steered most by middle vortex in June, heavy rainfall is collectively affected by both middle vortex and north vortex in July and August with a certain periodic variation. Moreover, north vortex has abundant moisture transportation while middle vortex is opposite. The combination of shear convergence field and vapor transportation plays an important role in severe precipitation. The precipitation near cold vortex center is likely to occur in the north of baroclinic zone and left to where upper level jet exits, while rain in front or behind trough is located in the south of baroclinic zone and right to where upper level jet enters, and the secondary circulation resulting from upper level jet exists in precipitation area within baroclinic zone. The cyclonic circulation induced by high potential vorticity triggers ascending movement of rainfall near cold vortex center, combined with obvious activity of dry intrusion in the rainfall area behind trough.

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李爽,丁治英,劉云樺,田璐.東北冷渦下遼寧省短時強降水統(tǒng)計與合成分析.氣象科學,2017,37(1):70-77 LI Shuang, DING Zhiying, LIU Yunhua, TIAN Lu. Statistical and composite analysis on short-time heavy rainfall of Liaoning province under Northeast China cold vortex. Journal of the Meteorological Sciences,2017,37(1):70-77

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收稿日期:2015-11-23
最后修改日期:2016-01-26
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在線發(fā)布日期: 2017-03-07
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