一次江淮氣旋大暴雨的診斷分析和數(shù)值模擬

doi:10.12306/2020jms.0029

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一次江淮氣旋大暴雨的診斷分析和數(shù)值模擬
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                        10.12306/2020jms.0029
                    
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中圖分類號:P456.7
基金項(xiàng)目:江蘇省氣象局青年基金資助項(xiàng)目（KQ202126）

Diagnostic analysis and numerical simulation of a heavy rainstorm associated with the Jianghuai cyclone

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利用ERA Interim Daily的0.5°×0.5°資料對2011年6月9—10日的一次江淮氣旋大暴雨天氣過程進(jìn)行天氣學(xué)分析。結(jié)果表明：江淮氣旋和低空急流是本次大暴雨過程的主要影響系統(tǒng)；高空200 hPa西風(fēng)急流右側(cè)的上升支和鋒面的抬升作用提供了動力條件；低空西南急流提供了水汽條件，此次過程對流條件較好，具有較大的對流有效位能（Convective Available Potential Energy，CAPE）；大氣的對流不穩(wěn)定性遠(yuǎn)大于斜壓性，強(qiáng)降水發(fā)生在濕位渦正負(fù)值過渡的等值線密集帶附近。過程最強(qiáng)降水時段由一次長生命史的中尺度颮線過程導(dǎo)致，利用WRF v3.9可以進(jìn)行較好地模擬。研究颮線的環(huán)境條件和結(jié)構(gòu)特征發(fā)現(xiàn)，環(huán)境大氣具有較大的CAPE值和較小的對流抑制能（Convective Inhibition Energy，CIN），有利于對流的觸發(fā)；較強(qiáng)的0~3 km垂直風(fēng)切變，有利于颮線的維持；盡管冷池較淺薄，但冷池出流的抬升作用有利于對流的觸發(fā)和颮線的維持。

Abstract:

Based on the ERA Interim Daily data, a heavy rainstorm associated with the Jianghuai cyclone occurred during 9 to 10 in June 2011 was analyzed. Results show that the Jianghuai cyclone and the jet stream at high and low levels are the main influencing systems of the heavy rainstorm. The upward motion on the right side of the west jet stream at 200 hPa and frontal lifting provides uplift conditions for the occurrence of heavy rainfall; the low-level southwest jet stream transports water vapor. The convection condition of this event is good with a large CAPE value; the convective instability of atmosphere is far greater than the baroclinic instability and the strong precipitation occurrs in the vicinity of the dense zone of positive and negative values of MPV. The period of maximum precipitation in this process is caused by a long-lasting mesoscale squall line well reproduced by the WRF v3.9 numerical model. The environmental conditions and structural features of the squall line were analyzed,and the results show that the atmospheric environment has large Convective Available Potential Energy(CAPE) and small Convective Inhibition Energy(CIN), which is conducive to the triggering of convection; the atmospheric environment also has a strong vertical wind shear between 0-3 km, which is advantageous to the maintenance of squall line; although the cold pool of squall line was fairly shallow, the uplift by the cold pool is conducive to the triggering of convection and hence the maintenance of squall line.

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吳瓊,陳圣劼,白楊,夏露,汪嬋娟.一次江淮氣旋大暴雨的診斷分析和數(shù)值模擬.氣象科學(xué),2021,41(1):86-98 WU Qiong, CHEN Shengjie, BAI Yang, XIA Lu, WANG Chanjuan. Diagnostic analysis and numerical simulation of a heavy rainstorm associated with the Jianghuai cyclone. Journal of the Meteorological Sciences,2021,41(1):86-98

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收稿日期:2019-08-09
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在線發(fā)布日期: 2021-03-20
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