| 海河流域切变线类暴雨成因分析 |
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| 引用本文： | 卢焕珍,刘一玮,张楠.海河流域切变线类暴雨成因分析[J].气象与环境学报,2014,30(1):15-22. |
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| 作者姓名： | 卢焕珍 刘一玮 张楠 |
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| 作者单位： | 1.天津市气象台,天津300074；2.河北省气象与生态环境重点实验室，河北 石家庄 050021 |
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| 基金项目： | 河北省气象与生态环境重点实验室科研开放课题（Z-1201）、预报员专项（CMAYBY2012-003）和天津市气象局科研项目（201315）共同资助. |
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| 摘 要： | 应用常规观测资料、FY2C卫星TBB资料、多普勒雷达资料、风廓线雷达、加密自动站以及NCEP1°×1°再分析资料分析海河流域切变线类暴雨成因。结果表明：暴雨过程是低空切变线与高低空急流构成有利配置条件下发生的, 系统空间结构和冷空气移动路径的不同，造成了暴雨落区和强度的不同；沿切变线有带状中-α尺度对流云团形成和发展，并有中-β尺度MCS沿带状有组织的发展、移动、合并、加强，沿低空切变线如有低涡形成，带状对流云系内将有MCC形成，强降雨在MCS或MCC移动方向的前侧、TBB等值线梯度最大处；强降雨之前都有水汽辐合从地面向高层伸展，伸展高度越高，降雨强度越大，强降雨中心对应西南与偏东两个大水汽通量造成的辐合且等值线密集处；VAD风廓线和风廓线雷达资料都显示出对流层低空急流和超低空急流的先后形成，造成雨强也两度加强。
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| 关 键 词： | 低空切变线 中尺度对流系统 云顶亮温 风廓线雷达 |
Cause of heavy rain by shear line in the Haihe river basin |
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| LU Huan-zhen; LIU Yi-weix,ZHANG Nan.Cause of heavy rain by shear line in the Haihe river basin[J].Journal of Meteorology and Environment,2014,30(1):15-22. |
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| Authors: | LU Huan-zhen; LIU Yi-weix ZHANG Nan |
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| Institution: | 1. Tianjin Meteorological Observatory, Tianjin 300074, China; 2. Key Laboratory of Meteorology and Ecological Environment of Hebei Province, Shijiazhuang 050021, China |
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| Abstract: | Based on conventional meteorological data from automatic weather stations and intensive stations, FY-2C TBB data, Doppler radar data, wind profiler radar data, and the NCEP reanalysis data with 1°× 1° resolution, the cause of heavy rain by shear line in the Haihe river basin was analyzed. The result shows that the heavy rain occurs under the favorable configuration condition of the low-level shear line and the upper and lower level jets. The differences of the cold air path and the vertical structure lead to the heavy rain falling in different areas with differ- ent intensity. The banded ot-mesoscale convective cloud generates and develops along the shear line, and the β-me- soscale MCS （Mesoscale Convective System） develops, moves, combines, strengthens along the band. The MCC （ Mesoscale Convective Complex） will generate within the banded convective cloud system if the vortex is formed along the lower shear line. The position of heavy rainfaU is located in the front side of the MCS or MCC moving direction and in the area of the maximum gradient of the TBB contour. The water vapor convergence stretches from the ground to high level before the heavy rainfall. The higher the stretching height of water vapor layer is, the stronger the rainfall is. The center of the heavy rain is corresponding to the two large values of water vapor flux convergent zones in the southwest and east areas where the contours are intensive. The VAD （Velocity Azimuth Display） wind profiles and wind profile radar data show that the low-level jet and ultra low-level jet successively anoear which makes the rain intensity strengthened again. |
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| Keywords: | Low-level shear line Mesoscale convective system Temperature brightness （TBB） Wind profiler radar |
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