雙流機場“7.21”暴雨微物理特征及觸發(fā)維持機制分析

doi:10.12306/2020jms.0045

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雙流機場“7.21”暴雨微物理特征及觸發(fā)維持機制分析
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                        10.12306/2020jms.0045
                    
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中圖分類號:P426.611
基金項目:國家自然科學(xué)基金聯(lián)合基金資助項目（U1733203）

Microphysical characteristics,initiation and maintenance of heavy rainfall at Chengdu Shuangliu Airport on 21 July 2017

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利用天氣雷達(dá)、地面自動站和微波輻射儀等多種氣象探測資料，對2017年7月發(fā)生在成都雙流機場的一次暴雨過程進(jìn)行了分析。結(jié)果表明：此次暴雨發(fā)生在弱天氣系統(tǒng)強迫條件下，大氣層結(jié)呈現(xiàn)弱對流抑制、低抬升凝結(jié)高度、中等對流有效位能，濕層深厚，低層較暖且低層無急流影響。短時強降水由中尺度系統(tǒng)直接產(chǎn)生，午夜前的初始對流由高壓西北部偏南暖濕氣流與山體下滑冷氣流相互作用，結(jié)合山前強水平溫度梯度產(chǎn)生，之后在冷池和邊界層暖濕氣流作用下生成新的對流。產(chǎn)生強降水的回波結(jié)構(gòu)密實，暖云特征突出，屬于熱帶低質(zhì)心降水系統(tǒng)。對抬升凝結(jié)高度、自由對流高度、濕層厚度等的分析表明，水汽條件較為極端，但由于系統(tǒng)整體屬于前向傳播，無明顯的"列車效應(yīng)"，限制了實際降水效率。

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A heavy rainfall occurred at Chengdu Shuangliu Airport on 21 July 2017 was studied based on dataset from ground-based Doppler radar, automatic weather stations and microwave radiometer, et al. The results show that the ambient conditions and dynamic forcing prior to the event were weak and characterized by small value of Convective Inhibition(CIN), moderate Convective Available Potential Energy(CAPE),low Lifting Condensation Level(LCL),deep warm layer and moist southerly flow. The initial convection storms were triggered mainly by a convergence line formed by the warm flow from the cities and cold down-lope wind in front of mountains, which combined with the intense temperature gradient. And then the outflow of the cold pools located southerly impacting with the warm,moist boundary layer introduced the other convective storms. The micro-physical analysis indicates that the heavy rainfall was mainly composed of high-precipitation-efficiency warm rain process supported with low-centroid cumulonimbus structures. It also suggested that the forward-propagation storms have played a big role in the local heavy rainfall with intensifying southerly flow and dramatic water vapor supply.

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宋靜,傅文伶.雙流機場“7.21”暴雨微物理特征及觸發(fā)維持機制分析.氣象科學(xué),2021,41(1):119-127 SONG Jing, FU Wenling. Microphysical characteristics, initiation and maintenance of heavy rainfall at Chengdu Shuangliu Airport on 21 July 2017. Journal of the Meteorological Sciences,2021,41(1):119-127

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收稿日期:2018-10-08
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