| 一次弱垂直风切变环境条件下短时大暴雨的研究 |
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| 引用本文： | 罗王军,蒋友严,敖泽建.一次弱垂直风切变环境条件下短时大暴雨的研究[J].新疆气象,2019,13(2):32-39. |
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| 作者姓名： | 罗王军 蒋友严 敖泽建 |
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| 作者单位： | 甘南州气象局;西北区域气候中心;山西省气象灾害防御技术中心 |
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| 基金项目： | “21世纪初祁连山积雪变化对周边生态环境影响”(1506RJYA189)和中国气象局气候变化专项“典型生态环境下的气候容量研究”(CCSF201612)资助 |
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| 摘 要： | 利用雷达回波、探空、区域自动站降水资料,对2016年8月22日发生在甘肃省甘南州碌曲县的局地大暴雨天气过程进行分析。结果表明:这是一次在弱垂直风切变环境条件下发生在两个592 dagpm副热带高压之间切变区的短时大暴雨,地面冷锋、露点锋以及地形抬升共同触发了对流;前期的逆温层结和高温高湿状态的空气对大暴雨发生有很重要的指示意义;大暴雨发生时有强烈的上升运动和明显的的水汽输送;新单体与旧单体的合并指示强降水的开始,降水主要集中在回波开始合并增强到趋于减弱的近2 h内,垂直积分液态水含量大于1.00 kg/m~2的时段每10min降水量基本在10 mm以上。
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| 关 键 词： | 大暴雨 弱垂直风切变 切变区 露点锋 雷达回波 |
| 收稿时间： | 2017/10/26 0:00:00 |
| 修稿时间： | 2018/1/28 0:00:00 |
Analysis of a Short-time Heavy Rain inWeak Vertical Wind Shear Environment |
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| LUO Wangjun,JIANG Youyan and AO Zejian.Analysis of a Short-time Heavy Rain inWeak Vertical Wind Shear Environment[J].Bimonthly of Xinjiang Meteorology,2019,13(2):32-39. |
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| Authors: | LUO Wangjun JIANG Youyan and AO Zejian |
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| Institution: | Gannan Tibetan Autonomous Prefecture Meteorological Bureau,Gansu Gannan,Northwest Regional Climate Center,Gansu Lanzhou,Gannan Tibetan Autonomous Prefecture Meteorological Bureau,Gansu Gannan |
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| Abstract: | Based on the radar,sounding and regional automatic meteorological station precipitation data,a local heavy rainfall which occurred in weak vertical wind shear condition in Luqu County,Gannan Tibetan Autonomous Prefecture,Gansu Province on August 22,2016 was analyzed.The results show that it is a short-time heavy precipitation occurred between two 592dagpm high pressures.The breakage of the 592dagpm high pressure which make Luqu involved in the shear zone .The ground cold front,the dew point front and the surface topography jointly trigger the convection.The inversion stratosphere and the wet and warm air play indicative roles for the occurrence of heavy precipitation,which is accompanied by the strong updraft and obvious water vapor transportation. The combination of the developing storm and mature storms implies the beginning of this rainfall process, and the precipitation is mainly concentrated in the period when the echo strength changes from enhancement to gradual reduction, totally about 2 hours.Basically, when VIL are greater than 1.00kg/m2 ,the accumulated precipitation are tends to exceed 10mm for every 10min. |
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| Keywords: | heavy rain weak vertical wind shear shear zone dew point front radar echo |
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