滇中一次局地大暴雨的中尺度特征分析
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摘要
针对2017年6月19日云南中部易门局地大暴雨过程,使用ERA5 0.25°×0.25°再分析资料、国家站和加密自动站观测数据、多普勒雷达和FY-2G卫星资料,分析此次过程的环流形势和中尺度特征。结果表明,700 hPa切变线和地面辐合线的共同作用导致易门局地大暴雨的发生;地面辐合线在滇中长时间维持,有利于对流系统的发展。卫星云图上,中尺度对流系统在移动过程中与多个对流系统合并,使之不断发展增强。对流云团云顶亮温等温线密集区处于易门上空时,对应地面强降水的发生。雷达图上,19日21:00—22:00中尺度对流系统发展旺盛并滞留在易门上空,降水形式以积云性降水为主;20日01:00—02:00多个对流系统合并增强后东移到达易门,对流回波高度较前一日21:00—22:00低,降水形式为层云和积云混合性降水。
Large-scale circulation pattern and mesoscale features of a local rainstorm event happened over Yimen,Yunnan on June 19 th 2017 were analyzed using the data from ERA5 0.25°×0.25° reanalysis,ordinary observations and automatic station observations,Doppler weather radar and FY-2 G satellite. The results showed that a shear line at 700 hPa level and a convergence line at the surface were the dominant synoptic systems for this local rainstorm event,among which the convergence line retained its strength for long,favoring the development of convection systems. Shown on the satellite images,a mesoscale convective system continuously merged with other convective systems along its moving path,making the convective system develop continuously.When the gradient of cloud top balck body temperature was high over Yimen,heavy precipitation occurs at surface. Shown in the radar echo charts,a mesoscale convective system developed and stayed above Yimen at 21:00-22:00,June 19 th,with the convective precipitation as the main precipitation type. At 01:00-02:00,June 20 th,multiple convective systems merged and arrived at Yimen,for which the echo height of convective were lower than those at 21:00-22:00,June 19 th. The precipitation in this 2-hour period was mixed with convective and stratiform precipitation.
Large-scale circulation pattern and mesoscale features of a local rainstorm event happened over Yimen,Yunnan on June 19 th 2017 were analyzed using the data from ERA5 0.25°×0.25° reanalysis,ordinary observations and automatic station observations,Doppler weather radar and FY-2 G satellite. The results showed that a shear line at 700 hPa level and a convergence line at the surface were the dominant synoptic systems for this local rainstorm event,among which the convergence line retained its strength for long,favoring the development of convection systems. Shown on the satellite images,a mesoscale convective system continuously merged with other convective systems along its moving path,making the convective system develop continuously.When the gradient of cloud top balck body temperature was high over Yimen,heavy precipitation occurs at surface. Shown in the radar echo charts,a mesoscale convective system developed and stayed above Yimen at 21:00-22:00,June 19 th,with the convective precipitation as the main precipitation type. At 01:00-02:00,June 20 th,multiple convective systems merged and arrived at Yimen,for which the echo height of convective were lower than those at 21:00-22:00,June 19 th. The precipitation in this 2-hour period was mixed with convective and stratiform precipitation.
引文
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[5] 汪小康,赵玉春,王晓芳,等.江西一次特大暴雨中尺度对流系统特征对比分析[J].高原气象,2016,35(1):143-157.
[6] 段旭,许美玲,孙绩华,等.一次滇西南秋季暴雨的中尺度分析与诊断[J].高原气象,2003,22(6):597-601.
[7] 马红,曾厅余,刘少荣,等.滇东北2010年7月三次局地暴雨过程诊断分析[J].暴雨灾害,2011,30(1):51-56.
[8] 许美玲,尹丽云,金少华,等.云南突发性特大暴雨过程成因分析[J].高原气象,2013,32(4):1062-1073.
[9] 马志敏,余珂,杨超,等.一次局地突发性暴雨过程成因及数值试验分析[J].云南大学学报(自然科学版),2016,38(1):72-80.
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[11] 李青春,苗世光,郑祚芳,等.北京局地暴雨过程中近地层辐合线的形成与作用[J].高原气象,2011,30(5):1232-1242.
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