新疆伊犁河谷2016夏季一次對(duì)流性短時(shí)強(qiáng)降水個(gè)例分析

doi:10.12306/2023jms.0066

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新疆伊犁河谷2016夏季一次對(duì)流性短時(shí)強(qiáng)降水個(gè)例分析
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                        10.12306/2023jms.0066
                    
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中圖分類號(hào):P426.6
基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(42265003);國(guó)家重點(diǎn)研發(fā)計(jì)劃重點(diǎn)專項(xiàng)資助項(xiàng)目(2018YFC1507103);新疆維吾爾自治區(qū)自然科學(xué)基金資助項(xiàng)目(2022D01C359);中央高校基本科研業(yè)務(wù)費(fèi)專項(xiàng)資金(020714380171;020714380177)

A case study of convective short-time heavy rain in Xinjiang Ili valley in 2016

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利用四維變分同化系統(tǒng)對(duì)ERA5再分析資料、地面站觀測(cè)資料和天氣雷達(dá)數(shù)據(jù)進(jìn)行同化,得到了新疆伊犁河谷2016年6月17日一次對(duì)流性降水全生命史的高時(shí)空分辨率全變量分析場(chǎng),并利用其對(duì)對(duì)流系統(tǒng)的觸發(fā)和發(fā)展機(jī)制進(jìn)行了分析。結(jié)果表明:此次降水過(guò)程發(fā)生在“兩槽兩脊”背景環(huán)流形勢(shì)下,中亞低渦截?cái)嗔讼蛐陆斔偷募骨拔鞅睔饬?使西南氣流與西北氣流在新疆中部輻合,為降水提供良好的背景條件。伊犁地區(qū)南北被高山包圍,產(chǎn)生狹管效應(yīng),吹入的西風(fēng)風(fēng)速增大,激發(fā)了滾渦,使上升氣流位置氣塊不斷升高,最終形成多個(gè)對(duì)流單體,產(chǎn)生降水。對(duì)流單體前進(jìn)過(guò)程中受到山地阻擋減速,與后續(xù)單體發(fā)生合并,使對(duì)流增強(qiáng),造成降水的加強(qiáng)。隨著地形繼續(xù)抬升,對(duì)流消亡。

Abstract:

By using a four-dimensional variational assimilation system to assimilate ERA5 reanalysis data, observation data from ground station, and weather radar data, a high spatiotemporal resolution all variable analysis field of the entire life history of convective precipitation in the Ili River Valley of Xinjiang on June 17, 2016 was obtained. The triggering and development mechanisms of the convective system were analyzed using this field. Results show that this precipitation process occurred under the background circulation pattern of "two troughs and two ridges". The central Asian low vortex intercepted the northwest airflow in front of the ridge that was transported to Xinjiang, causing the southwest airflow and northwest airflow to converge in the central part of Xinjiang, providing a good background condition for precipitation. The northern and southern parts of the Ili region are surrounded by high mountains, resulting in a narrow tube effect. The westerly wind speed increases, triggering rolling vortices and causing the upward airflow position continuously rise, ultimately forming multiple convective cells and generating precipitation. During the process of advancing convective cells, they were obstructed, slowed down by mountains, and then they merged with subsequent cells, enhanced convection and resulted in increasing precipitation. As the terrain continues to rise, convection disappears.

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翟芃,明杰.新疆伊犁河谷2016夏季一次對(duì)流性短時(shí)強(qiáng)降水個(gè)例分析.氣象科學(xué),2024,44(4):655-662 ZHAI Peng, MING Jie. A case study of convective short-time heavy rain in Xinjiang Ili valley in 2016. Journal of the Meteorological Sciences,2024,44(4):655-662

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收稿日期:2023-03-06
最后修改日期:2023-05-02
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在線發(fā)布日期: 2024-09-23
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