辽宁中东部地区一次强降雪天气过程分析

摘要

By using the observed data of conventional meteorological stations and 6-hourly NECP 1oí1oanalysis data,a heavy snow event during November 22nd to 23rd in 2011 was analyzed from aspects of circular situation,physical diagnosis,phase transformation of precipitation and radar data. The results were as follows①Interaction between cold and warm air led to the heavy snow event.The Mongolian cyclones and upper trough were the main effect system.②Low-level convergence and high-level divergence showed that convective developed vigorously.Dynamic and unstable energy were strong.And this gave priority to convective precipitation.The event was short-term strong precipitation.③Sufficient moisture transmission is necessary condition of precipitation intensity.The water vapor origin of precipitation was from bohai sea and yellow sea.The strong rainfall area was well corresponded to the high humidity area and the high vertical speed area.And this was closely related to duration of precipitation.%针对辽宁2011年11月22-23日旬初大雪到暴雪过程，利用常规观测资料和NCEP 1º×1º逐6 h分析资料，从环流形势、物理量诊断、降水相态和雷达资料等入手，对此次暴雪过程进行综合分析。结果表明：①此次过程是冷暖空气共同作用的结果，主要影响系统是蒙古气旋和高空槽；②此次降水过程持续时间短，低层辐合高层辐散的结构表明对流发展旺盛，动力和不稳定能量强，降水以对流性降水为主，多短时强降水；③充沛的水汽输送是强降水发生的必要条件，此次过程的水汽源地为黄、渤海地区，强降水区域与高湿区、垂直速度大值区相对应，并且跟降水持续时间密切相关。