兩次西南低渦造成廣西暴雨差異的對比分析

doi:10.3969/2012jms.00**

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兩次西南低渦造成廣西暴雨差異的對比分析
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                        10.3969/2012jms.00**
                    
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中圖分類號:P458
基金項(xiàng)目:國家自然科學(xué)基金項(xiàng)目(40675032);廣西氣象局重點(diǎn)科研項(xiàng)目(桂氣科：200725)

Comparison and analysis on the differences between two torrential〖JP〗 rain events caused by southwest vortex in Guangxi

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利用ECMWF 2.5°×2.5°客觀分析資料和MICAPS常規(guī)資料，對2008年6月12日和16日兩次西南低渦影響，造成廣西暴雨范圍和強(qiáng)度明顯差異的成因進(jìn)行了對比分析，結(jié)果表明：（1）“6.12”過程西南低渦深厚，其發(fā)展過程中始終伴隨著強(qiáng)盛的西南低空急流；而“6.16”過程西南低渦較淺薄，其發(fā)展過程中無西南低空急流的配合；（2）“6.12”過程低渦發(fā)展強(qiáng)盛，渦旋度大，正渦度值達(dá)200 hPa高度，上升運(yùn)動(dòng)強(qiáng)烈；而“6.16”過程低渦發(fā)展較弱，渦旋度小，正渦度值只到500 hPa高度，上升運(yùn)動(dòng)相對較??；（3）“6.12”過程水汽來源于孟加拉灣和南海，水汽輻合強(qiáng)；而“6.16”過程水汽僅來源于孟加拉灣，水汽輻合較弱；（4）兩次西南低渦影響，對流層上下之間的風(fēng)垂直切變小，有利于中尺度對流云團(tuán)的發(fā)生發(fā)展。

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Using ECMWF 25°×25° objective analysis data and MICAPS conventional data, two quite different torrential rain processes, especially in range and intensity, from June 12 to 16 during 2008 in Guangxi caused by successive southwest vortexes has been compared and analyzed. The result shows: (1) In the June 12 process, the southwest vortex was very deep with an accompanying strong southwest jet at low level during its evolution all along; while in the June 16 process, the southwest vortex was shallow, and there was no southwest jet coordinating it. (2) In the June 12 process, the vortex developed powerfully and prosperously with large rotation and strong upward motion, and the positive vorticity can extend to 200 hPa, but in the June 16 process, the vortex development was weaker, so was the rotation and upward motion, and the positive vorticity can only reach 500 hPa.(3) In the June 12 process, the water vapor came from the Bay of Bengal and the South China Sea with strong convergence, but in the June 16 process, the water vapor mostly came from the Bay of Bengal, and the convergence was weaker. (4) In these two processes, both the vertical wind shears in troposphere were not remarkable, which is benefit to the occurrence and the development of the meso-scale convective clusters.

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高安寧,陳見,李生艷,何冬燕,黃明策.兩次西南低渦造成廣西暴雨差異的對比分析.氣象科學(xué),2009,(4):557-563 Gao Anning, Chen Jian, Li Shengyan, He Dongyan, Huang Mingce. Comparison and analysis on the differences between two torrential〖JP〗 rain events caused by southwest vortex in Guangxi. Journal of the Meteorological Sciences,2009,(4):557-563

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收稿日期:2008-10-17
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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说