Using mesoscale numerical model WRFV3.7,simulation tests of a low-vortex rainstorm were carried out in Langfang area,and simulation results of three boundary layer parameterization schemes(MYJ,YSU,ACM2)were contrasted...Using mesoscale numerical model WRFV3.7,simulation tests of a low-vortex rainstorm were carried out in Langfang area,and simulation results of three boundary layer parameterization schemes(MYJ,YSU,ACM2)were contrasted.The results showed that the rainstorm in Langfang area had better dynamic condition.By the influence of northeast cold vortex,cold vortex at high altitude cooperated with the surface wind speed convergence,which provided better dynamic condition for strong convective rainfall.Three boundary layer parameterization schemes all simulated surface wind speed convergence of rainstorm center.Simulation results of 24-h rainfall distribution showed that the simulation of YSU scheme was better than ACM2 and MYJ.The simulation results of flow field and temperature field also verified that YSU scheme was better than other schemes.展开更多
基于ERA5再分析资料、中国自动气象站与NOAA(National Oceanic and Atmospheric Administration)气候预测中心卫星反演降水资料CMORPH(Climate Prediction Center Morphing Technique)融合的逐时降水量网格数据集,从环流背景、水汽输送...基于ERA5再分析资料、中国自动气象站与NOAA(National Oceanic and Atmospheric Administration)气候预测中心卫星反演降水资料CMORPH(Climate Prediction Center Morphing Technique)融合的逐时降水量网格数据集,从环流背景、水汽输送、涡度收支等方面对比分析了华南沿海地区2011年6月29日极端持续性强降水事件(以下简称“11.6”强降水)与2013年4月25日极端短时强降水事件(以下简称“13.4”强降水)的发生发展机制。结果显示:“11.6”强降水伴随着稳定的低压天气系统,高空由涡旋主导,低空具有稳定的水汽输送带;而“13.4”强降水不具备稳定的天气系统,低空水汽输送少,但由于存在短时的强水汽辐合导致小时降水量大。“11.6”强降水存在更大的正涡度收入,低空急流是低层涡度收入的关键,中层涡旋的生成加强是中层涡度收入的关键,同时两者的正反馈作用也是降水维持的重要因素。展开更多
文摘Using mesoscale numerical model WRFV3.7,simulation tests of a low-vortex rainstorm were carried out in Langfang area,and simulation results of three boundary layer parameterization schemes(MYJ,YSU,ACM2)were contrasted.The results showed that the rainstorm in Langfang area had better dynamic condition.By the influence of northeast cold vortex,cold vortex at high altitude cooperated with the surface wind speed convergence,which provided better dynamic condition for strong convective rainfall.Three boundary layer parameterization schemes all simulated surface wind speed convergence of rainstorm center.Simulation results of 24-h rainfall distribution showed that the simulation of YSU scheme was better than ACM2 and MYJ.The simulation results of flow field and temperature field also verified that YSU scheme was better than other schemes.
文摘基于ERA5再分析资料、中国自动气象站与NOAA(National Oceanic and Atmospheric Administration)气候预测中心卫星反演降水资料CMORPH(Climate Prediction Center Morphing Technique)融合的逐时降水量网格数据集,从环流背景、水汽输送、涡度收支等方面对比分析了华南沿海地区2011年6月29日极端持续性强降水事件(以下简称“11.6”强降水)与2013年4月25日极端短时强降水事件(以下简称“13.4”强降水)的发生发展机制。结果显示:“11.6”强降水伴随着稳定的低压天气系统,高空由涡旋主导,低空具有稳定的水汽输送带;而“13.4”强降水不具备稳定的天气系统,低空水汽输送少,但由于存在短时的强水汽辐合导致小时降水量大。“11.6”强降水存在更大的正涡度收入,低空急流是低层涡度收入的关键,中层涡旋的生成加强是中层涡度收入的关键,同时两者的正反馈作用也是降水维持的重要因素。
