[目的]分析一次罕见的局地大暴雨动力条件.[方法]利用常规资料、地面加密自动站资料、风廓线雷达资料和多普勒雷达资料,对2010年8月3日临沂地区出现的一次强降水、局地大暴雨天气进行分析,探讨产生此次局地大暴雨的动力条件.[结果]这次降水过程主要是受副热带高压边缘的西南气流、西风槽前从中高层向南渗透的小股冷空气和高层(10 km以上)一直维持的东风波等不同尺度、不同高度系统共同作用的结果；大气层结的不稳定是强降水发生的前提,地面辐合、东风波与中高层西北气流的相互作用触发了不稳定能量的释放,副高边缘的西南气流提供了水汽供应.此次降水过程降水时间短、强度大、雨区移动呈现明显的方向性,具有明显的中尺度强对流系统特征,强降水的落区与加密风场辐合汇点的位置非常吻合,可以根据加密风场辐合位置随时间的移动推断下一时刻强降水的落区.风廓线雷达资料与多普勒雷达风廓线产品结合分析可以更准确地反应大气垂直风场结构.[结论]该研究为暴雨预报提供一定的参考依据.%[Objective] The aim was to discuss dynamic conditions for one rare regional rainstorm. [ Method ] By using conventional material, ground encryption automatic standing material, wind profiling radar data and Doppler radar data, strong precipitation and regional large rain storm in lingxi area on August 3, 2010, was expounded principal of heavy weather analysis. [ Result] The precipitation-process was the result of different scale and different height systems influenced by the southwest airflow in the edge of subtropical high, weak mid - latitude trough before high - level south from the small cold air permeability and senior (10km above); the instability of atmosphere structure was the premise of strong precipitation. Ground convergent, east storm with senior northwestern current interaction triggered unstable energy released; the southwest airstream in the edge of subtropical high provided water vapor supply. The duration of the precipitation was short and the intensity was large. Precipitation moved to certain direction, having typical mesoscale strong convection system. Strong precipitation fell in the same place as the convergence area of wind field. The place having next strong precipitation can be predicted based on the wind field convergence position along with the movement of time. Outline radar data and Doppler radar data contour line products can more accurately represent at mospheric vertical wind field structure. [ Conclusion] The study provided certain references for the report of rainstorm.
展开▼
