一次颮線演變?yōu)閰^(qū)域持續(xù)性特大暴雨過程的模擬分析

doi:10.12306/2023jms.0002

首頁 > 過刊瀏覽>2024年第44卷第6期 >1016-1026. DOI:10.12306/2023jms.0002

一次颮線演變?yōu)閰^(qū)域持續(xù)性特大暴雨過程的模擬分析
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                        10.12306/2023jms.0002
                    
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中圖分類號:P458.121.1
基金項目:山東省自然科學基金面上資助項目(ZR2022MD40);中國氣象局創(chuàng)新發(fā)展專項(CXFZ2023J084);山東省氣象局科技基金面上資助項目(2022sdqxm04);環(huán)渤海區(qū)域科技協(xié)同創(chuàng)新基金資助項目(QYXM202007;QYXM202202;QYXM202202);山東臺風與海洋氣象創(chuàng)新團隊(SDCXTD2021-2)

Simulation analysis of a process evolving form a squall line to a regional persistent heavy rain

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本文對2020年8月13—14日山東一次颮線演變?yōu)閰^(qū)域持續(xù)性特大暴雨的過程進行了數(shù)值模擬和診斷分析,發(fā)現(xiàn):(1)前期降水形成的冷池出流遇西南暖濕氣流觸發(fā)東北—西南向颮線系統(tǒng);(2)大尺度系統(tǒng)的移動速度決定了降水系統(tǒng)的性質(zhì):13日冷渦系統(tǒng)東移較快,形成的颮線自魯西北向魯東南不斷移動,而14日冷渦系統(tǒng)東移緩慢、副熱帶高壓脊線穩(wěn)定維持在32°N附近,大尺度環(huán)境相對穩(wěn)定導致區(qū)域性持續(xù)性降水的發(fā)生;(3)干冷空氣的侵入使得颮線內(nèi)對流單體沿干侵入與低層暖濕氣流的交界面強烈發(fā)展,并隨著干侵入的南推向東南移動,干侵入與西南暖濕氣流相對位置的變化促使此次暴雨過程由颮線演變?yōu)閰^(qū)域持續(xù)性降水,干侵入的穩(wěn)定少動使得魯南持續(xù)性降水得以較長時間維持;(4)對流環(huán)境的反復重建是此次區(qū)域持續(xù)性特大暴雨發(fā)生的中尺度環(huán)境影響因素。

Abstract:

The numerical simulation and diagnostic analysis of a regional persistent heavy rain process evolving form a squall line in Shandong Province on August 13-14, 2020 show that: (1) the outflow of cold pool formed by the previous precipitation meets the southwest warm and humid airflow, triggering the northeast-southwest squall line system. (2) The movement speed of the large-scale system determines the nature of the precipitation system. In 13, the cold vortex system moved eastward faster, and the formed squall line continuously moved from the northwest to the southeast in Shandong, while in 14, the cold vortex system moved eastward slowly, and the subtropical high ridge remained stable around 32°N, and the relatively stable large-scale environment led to the occurrence of regional persistent precipitation. (3) The invasion of dry and cold air makes the convective cells in the squall line develop strong along the interface between dry intrusion and low-level warm and wet air flow, and move to southeast with the dry intrusion moving southward. The change of the relative position of dry intrusion and southwest warm and wet airflow makes the rainstorm process evolve from the squall line to regional persistent precipitation, and the stable of dry intrusion enables the persistent precipitation in southern Shandong to be maintained for a long time. (4) The repeated reconstruction of the convective environment is the mesoscale influencing factor for the occurrence of the regional persistent heavy rain.

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肖明靜,吳煒,范蘇丹,曲巧娜,榮艷敏.一次颮線演變?yōu)閰^(qū)域持續(xù)性特大暴雨過程的模擬分析.氣象科學,2024,44(6):1016-1026 XIAO Mingjing, WU Wei, FAN Sudan, QU Qiaona, RONG Yanmin. Simulation analysis of a process evolving form a squall line to a regional persistent heavy rain. Journal of the Meteorological Sciences,2024,44(6):1016-1026

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收稿日期:2022-09-14
最后修改日期:2023-01-29
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在線發(fā)布日期: 2025-01-08
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