| 一次由列车效应引发的暴雨过程分析 |
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| 作者姓名： | 蓝俊倩 |
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| 作者单位： | 衢州市气象局 |
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| 基金项目： | 国家自然科学41575047资助 |
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| 摘 要： | 利用自动站资料、探空资料、NCEP再分析资料以及雷达资料,对2016年6月26日浙西地区一次暴雨过程的列车效应特征、物理量特征以及中尺度特征进行诊断分析。结果表明:暴雨产生于中低层暖切及地面低压倒槽的背景场中。强降水时段内回波在江西地区生成并沿同一路径东移影响浙西地区,产生列车效应,同时雷达速度场的低层辐合区有利于列车效应中东移回波增强并产生强烈降水。中低层湿度增加、垂直上升速度增大以及暖式切变线的加强有利于水汽辐合抬升的加强,使得列车效应增强,有利于降水的增大。26日11时以后衢州中北部地区列车效应的产生与维持与中低层正涡度和水汽通量辐合在这个区域的持续作用密不可分。Barnes滤波显示中尺度辐合线的维持和移动与列车效应的维持和生消有较好地对应关系,同时地面加密风场中稳定的低压环流有利于列车效应回波源地的维持,实际业务中应加强对地面加密风场和低层中尺度辐合线的分析。
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| 关 键 词： | 暴雨 Barnes滤波 中尺度辐合 列车效应 |
| 收稿时间： | 2017/10/17 0:00:00 |
| 修稿时间： | 2018/7/3 0:00:00 |
Analysis of a heavy rainfall process caused by train effect |
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| Authors: | Lan jun qian |
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| Institution: | Quzhou Meteorology Bureau |
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| Abstract: | This paper uses automatic station data, sounding data, NCEP reanalysis data and radar data to analyze and diagnose the heavy rainfall process caused by train effect in western Zhejiang Province on June 26. The results show that the heavy rainfall occurred in the background field of the middle-low layer warm wind shear and the surface low pressure circulation. The increase of precipitation corresponds to the significant increase of humidity below 500hPa and the maintenance of vertical ascending velocity below 800hPa.The increase of southwest wind velocity and the enhancement of warm temperature advection have a favorable effect on the transport of water vapor and the enhancement of warm wind shear, which is one of the important reasons for the increase of precipitation.Barnes mesoscale wave filter shows mesoscale convergence line combined with positive vortex and water vapor flux have effect on the strong rain area,which makes mesoscale convergence line continuing to produce rain clouds.The occurrence of train effect attributed to the direction of the guiding airflow and the low level convergence line is basically the same,and that is the main reason for this heavy rainfall. |
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| Keywords: | heavy rainfall Barnes wave filter mesoscale convergence train effect |
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