临夏地区局地突发强降水天气的综合分析

摘要

The text revealed the sudden rain of down-scaling northeast area Qinghai-Tibet Plateau based on 132 rain and rainstorm samples which occurred from June to August between 1990 and 2011 in the area by analyzing warm air transport, thermal field, dynamic field structure, weather system, strong convective cloud development situation, flow characteristics from surface to high level, terrain and physical distribution situation. We investigated the onset of sudden heavy rains with the number of occurrences and the data collected both at high altitudes and on the surface ground before and after the precipitation. Through a further careful analysis of the track system, the trigger mechanism and their causes of formation, we had a better understanding of such abrupt weather processes, thus initiating a new prediction method so as to improve the accuracy of our future forecast.%　　基于1990-2011年主汛期（6-8月）青藏高原东北侧临夏地区局地出现的132例25.0～140.0mm突发性强降水过程，从暖湿气流输送、热力、动力场结构、天气系统、强对流云发展形势、近地面至高空的流场特征、地形及相关物理量场分布形势等角度出发，揭示了青藏高原东北侧边坡局地突发性强降水的成因。综合强降水发生前后各时次的高空、地面资料，追综研究其影响系统、触发机制、成因等，通过对其进一步细致分析，加深对高原边坡地带突发性强降水过程触发机制的认识，寻找相关预报因子，以期提高对此类突发性强天气过程的认识，配合数值预报形势场及相关物理量场，启发新的预报着眼点。