強(qiáng)對(duì)流系統(tǒng)中對(duì)流云合并的觀測(cè)分析

doi:10.3969/2012jms.00**

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強(qiáng)對(duì)流系統(tǒng)中對(duì)流云合并的觀測(cè)分析
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P412
基金項(xiàng)目:國家自然科學(xué)基金資助項(xiàng)目（40675001、40905019），中國氣象局云霧物理環(huán)境重點(diǎn)開放實(shí)驗(yàn)室開放課題（2009008）

Observation and analysis on cumulus merging in severe mesoscale convective system

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用雷達(dá)等觀測(cè)資料以及LAPS(Local Analysis and Prediction System)中尺度再分析場(chǎng)資料，對(duì)2009年6月14日在河南、安徽等地引發(fā)冰雹大風(fēng)天氣的兩個(gè)強(qiáng)對(duì)流系統(tǒng)的形成演變過程中的對(duì)流云合并現(xiàn)象進(jìn)行觀測(cè)分析。研究表明，不論是單體間的合并還是對(duì)流系統(tǒng)間的合并，合并后單體或?qū)α飨到y(tǒng)都有顯著的增強(qiáng)，并且和強(qiáng)對(duì)流天氣的發(fā)生關(guān)系密切。安徽整個(gè)對(duì)流系統(tǒng)的形成經(jīng)歷了“小單體—大單體或積云團(tuán)—小的對(duì)流系統(tǒng)—大的對(duì)流系統(tǒng)”多階段的合并過程，強(qiáng)對(duì)流天氣發(fā)生和對(duì)流系統(tǒng)的陣風(fēng)鋒有關(guān)，合并過程中陣風(fēng)鋒達(dá)到最強(qiáng)；對(duì)流單體的合并和低層氣流的相互作用有關(guān)，是單體自身的出入流和環(huán)境引導(dǎo)風(fēng)共同作用的結(jié)果。LAPS中尺度再分析場(chǎng)資料的結(jié)果說明層結(jié)不穩(wěn)定、中尺度輻合和垂直風(fēng)切變是這次強(qiáng)對(duì)流系統(tǒng)形成和對(duì)流云合并的重要條件。

Abstract:

Cumulus merging in two severe convective systems occurred in Henna and Anhui on June 14, 2009 was analyzed based on radar data and data of LAPS(Local Analysis and Prediction System). The results showed that both cell merger and convective system merger enhanced obviously and developed into severe convective weather. In Anhui region, the development of the mesoscale convective system included clouds merger from small cell to large cell or cloud cluster, then to small convection system, at last, to large convection system. The severe convective weather was stimulated by gust front , which growed to severest during merging. Both the air flow from the low cells and environmental steering wind played important role in merging process, the interaction between clouds circulation and environmental steering wind was responsible for cumulus merging. The results of LAPS showed that stratification instability, mesoscale convergence and vertical wind shear were the main conditions for development of cumulus merging and severe convective system.

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翟菁,黃勇,胡雯,蔣年沖,牟容.強(qiáng)對(duì)流系統(tǒng)中對(duì)流云合并的觀測(cè)分析.氣象科學(xué),2011,(1):100-106 Zhai Jing, Huang Yong, Hu Wen, Jiang Nianchong, Mu Rong. Observation and analysis on cumulus merging in severe mesoscale convective system. Journal of the Meteorological Sciences,2011,(1):100-106

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收稿日期:2009-11-19
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