廊坊市一次区域性暴雨过程的对流指数分析

Convection Index Analysis of a Regional Rainstorm in Langfang

摘要: 利用MICAPS产品的中央气象台物理量格点数据、高空、地面等气象资料和双线性插值算法对2017年8月2日廊坊市一次区域性暴雨天气过程及其六种对流指数进行了深入分析，结果表明：本次区域暴雨过程中，造成南北部暴雨的影响系统明显不同，中北部暴雨的主要影响系统是短波槽，南部大城的大暴雨主要是登陆台风减弱后的低值系统影响。在南北暴雨产生的共同时段内，各对流指数显示南部强于中北部，对大城的大暴雨有较好的预报指示意义，北部的暴雨较南部弱，其对流指数的变化与降水的持续时间基本一致。对流指数的强弱程度、分布范围、发展变化与暴雨的强弱、分布范围、发生发展有较好的一致性，具有重要的参考价值。

Abstract: A regional rainstorm process and its six convective indices in Langfang City on August 2, 2017 were analyzed by using the physical quantity lattice data of the Central Meteorological Observatory of MICAPS products, meteorological data of high altitude and ground, and bilinear interpolation algorithm. The results show that during the rainstorm process in this region, the impact systems of the rainstorm in the north and the south are obviously different, and the main impact of the rainstorm in the north and central regions is different. The main impact system of heavy rain in the north central region is the shortwave trough, and the heavy rain in the southern metropolis is mainly affected by the low-value system after the landing typhoon weakens. During the common period of the rainstorm in the north and south, the convective indices show that the south is stronger than the middle and north, which has better forecasting significance for the heavy rain in the city. The rainstorm in the north is weaker than that in the south, and the change of the convec-tive indices is basically consistent with the duration of rainfall. The intensity, distribution range, development and change of convective index are in good agreement with the intensity, distribution range and occurrence and development of heavy rain, which has important reference value.