2017年6月4～5日银川市区域性暴雨成因分析
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摘要
利用欧洲中心数值预报高空形势场、地面形势场、物理量场以及自动气象站观测资料、多普勒雷达资料等,应用天气学分析及诊断分析方法对2017年6月4～5日银川市区域性暴雨天气过程的成因进行了系统分析。分析表明:此次降水天气是在有利的大尺度环流背景下,高低层天气系统共同作用产生的。500 hPa西风槽、南支槽和700 hPa低涡、切变线、低空急流以及地面冷锋是本次过程的主要影响系统。低层较强的水汽辐合为暴雨的产生提供了有利的水汽条件;涡度场、散度场、垂直速度等均表明,此次降水天气具有较好的动力条件。雷达速度场上表现出低层的汇聚流场,从低到高有较明显的暖平流结构,同时有明显的低空急流。通过对数值预报产品检验发现,WRF 9 km对此次降水过程的预报效果较好。
Based on weather patterns at the upper levels, surface plots, physical quantity field provided by the European Centre for Medium-Range Weather Forecasts(ECMWF), the observation data from automatic weather station and Doppler radar data and etc., the causes of regional rainstorm process in Yinchuan on 4～5 June in 2017 were analyzed systematically by using the applied meteorology and diagnostic analysis method. The results showed that the rainstorm was caused by the favorable large-scale circulation and weather system in upper-lower level air. The major influence system included 500 hPa westerly trough, south trough, 700 h Pa vortex, shear line, low-level jet and surface cold front. The strong moisture convergence in lower layer provided favorable vapour conditions for the rainstorm. The vorticity field, divergence field and vertical velocity all showed that this precipitation weather had better dynamic conditions. The convergent flow field at lower level, relatively obvious warm advection structure from low to high and obvious low-level jet could be found on the velocity field of the radar. The numerical prediction of product inspection found that WRF 9 km had better forecast effects for this precipitation process.
Based on weather patterns at the upper levels, surface plots, physical quantity field provided by the European Centre for Medium-Range Weather Forecasts(ECMWF), the observation data from automatic weather station and Doppler radar data and etc., the causes of regional rainstorm process in Yinchuan on 4～5 June in 2017 were analyzed systematically by using the applied meteorology and diagnostic analysis method. The results showed that the rainstorm was caused by the favorable large-scale circulation and weather system in upper-lower level air. The major influence system included 500 hPa westerly trough, south trough, 700 h Pa vortex, shear line, low-level jet and surface cold front. The strong moisture convergence in lower layer provided favorable vapour conditions for the rainstorm. The vorticity field, divergence field and vertical velocity all showed that this precipitation weather had better dynamic conditions. The convergent flow field at lower level, relatively obvious warm advection structure from low to high and obvious low-level jet could be found on the velocity field of the radar. The numerical prediction of product inspection found that WRF 9 km had better forecast effects for this precipitation process.
引文
[1]纪晓玲,贾宏元,沈跃琴,等. 2002年6月7~8日宁夏区域性暴雨天气过程分析[J].干旱气象,2004,22(2):18-23.
[2]穆建华,纪晓玲,辛尧胜.宁夏一次大到暴雨过程成因分析[J].宁夏大学学报(自然科学版),2012,33(3):309-313.
[3]白玲,聂晶鑫,李保华,等.中卫“7.28”区域性暴雨成因分析[J].安徽农业科学,2012,40(9):5567-5570.
[4]王建新,陈海成,赵学东,等.安阳一次局地大暴雨过程机制诊断分析[J].安徽农业科学,2011,39(24):14963-14966.
[5]张丹梅,辛艳辉,杨晓彤.低空急流演变对阜新地区短时暴雨影响研究[J].安徽农学通报,2014,20(15):146-151.
[6]房春琴,李秀琳,陈红梅,等.渭北一次区域性暴雨多普勒速度图分析[J].陕西气象,2007(2):18-20.
[2]穆建华,纪晓玲,辛尧胜.宁夏一次大到暴雨过程成因分析[J].宁夏大学学报(自然科学版),2012,33(3):309-313.
[3]白玲,聂晶鑫,李保华,等.中卫“7.28”区域性暴雨成因分析[J].安徽农业科学,2012,40(9):5567-5570.
[4]王建新,陈海成,赵学东,等.安阳一次局地大暴雨过程机制诊断分析[J].安徽农业科学,2011,39(24):14963-14966.
[5]张丹梅,辛艳辉,杨晓彤.低空急流演变对阜新地区短时暴雨影响研究[J].安徽农学通报,2014,20(15):146-151.
[6]房春琴,李秀琳,陈红梅,等.渭北一次区域性暴雨多普勒速度图分析[J].陕西气象,2007(2):18-20.