2012年“?？迸_風(fēng)影響江蘇的兩段大暴雨特征分析

doi:10.3969/2015jms.0014

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2012年“?？迸_風(fēng)影響江蘇的兩段大暴雨特征分析
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                        10.3969/2015jms.0014
                    
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基金項(xiàng)目:江蘇省省級科技創(chuàng)新與成果轉(zhuǎn)化(重大科技支撐與自主創(chuàng)新)專項(xiàng)(BE2008618)

Characteristics analysis on two stages of a torrential rain caused by the“Haikui”typhoon in Jiangsu province

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利用常規(guī)觀測資料、NCEP再分析資料以及加密自動氣象站資料,對2012年8月8-10日"?？?quot;臺風(fēng)影響江蘇的一次大暴雨過程進(jìn)行診斷分析。大暴雨過程有兩個不同發(fā)展階段,分析結(jié)果表明:兩段大暴雨的影響系統(tǒng)不同、熱力機(jī)制不同導(dǎo)致大暴雨落區(qū)、強(qiáng)度的不同。第一段是出現(xiàn)在江蘇的沿江和蘇南地區(qū)的臺風(fēng)本體大暴雨。隨著?？_風(fēng)在浙江登陸,臺風(fēng)東北象限東南低空急流攜帶強(qiáng)勁的海上暖濕氣流伸至江蘇南部,下層暖濕上層干冷的不穩(wěn)定層結(jié)積聚了大量不穩(wěn)定能量。第二段大暴雨為發(fā)生在江蘇北部的臺風(fēng)倒槽大暴雨。"海葵"臺風(fēng)減弱向西北移動進(jìn)入安徽東南部,西南季風(fēng)的加強(qiáng)和臺風(fēng)倒槽東側(cè)低空東南急流的匯合為強(qiáng)降水提供豐富的水汽,而臺風(fēng)倒槽東側(cè)低空急流攜帶的暖濕氣流與高空槽后冷空氣疊加,冷暖空氣交匯觸發(fā)了不穩(wěn)定能量釋放,激發(fā)了大暴雨過程的維持和增幅。整段大暴雨過程持續(xù)時間長、強(qiáng)度大,第二段比第一段降水區(qū)域小、持續(xù)時間短,但大暴雨中心過程雨量和降水強(qiáng)度更大。高低空急流耦合作用和強(qiáng)垂直螺旋度柱是此次大暴雨過程的動力抬升機(jī)制。

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Based on normal observation data, NCEP reanalysis data and automatic station data, a diagnostic analysis on a torrential rain process on August 8-10, 2012 caused by‘Haikui’typhoon in Jiangsu province was performed. The rainstorm was composed of two different development stages. Results showed that two kinds of systems and energy mechanisms led to different rain areas and intensities. The first-stage rainstorm was caused by typhoon in southern Jiangsu along the Yangtze River.With the landing of the‘Haikui’typhoon, the plenty of warm and moist air coming from the southeast low-level jet on the northeast side of the typhoon extended to the southern Jiangsu. Low-warm and the upper dry unstable stratification accumulated a large number of unstable energy. The second-stage rainstorm was caused by typhoon trough in northern Jiangsu. As the weakening typhoon moved to southeastern Anhui, the reinforced southwest monsoon mixing with the low-level southeast jet in the southern of the typhoon supplied abundant water vapor for the torrential rain. Moreover, the superposition of the cold air from the upper trough and the warm-wet air from the east of the typhoon trough and the intersection of the cool and warm air triggered the releasing of the unstable energy and activated the heaviest rainstorm. The severe rain process lasted for a long time and had strong intensity. The precipitation area and lasting time of the second stage was smaller and shorter than that of the first one, but the rainfall amount was bigger in the center of the rainstorm. It is the coupling of the low level jet and the high-level jet stream as well as the deep helicity column that provided dynamic lifting mechanism.

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潘婧茹,張雪蓉,馬明明,濮梅娟.2012年“?？迸_風(fēng)影響江蘇的兩段大暴雨特征分析.氣象科學(xué),2016,36(1):102-111 PAN Jingru, ZHANG Xuerong, MA Mingming, PU Meijuan. Characteristics analysis on two stages of a torrential rain caused by the“Haikui”typhoon in Jiangsu province. Journal of the Meteorological Sciences,2016,36(1):102-111

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收稿日期:2014-06-28
最后修改日期:2014-12-24
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在線發(fā)布日期: 2016-04-11
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