九寨黄龙机场一次长时间雷雨过程成因分析

Cause Analysis of Long Thunderstorm Process in Jiuzhai Huanglong Airport

本文利用NCEP/NCAR1°×1°再分析资料、常规资料、多普勒天气雷达资料等对九寨黄龙机场2021年9月25日的一次长时间雷雨过程的天气形势、物理量场及航班影响情况进行分析。本次雷雨天气受500hPa波动槽和700hPa低涡共同影响,孟加拉湾和南海的暖湿气流持续输送,高层抽吸作用增强抬升,为此次雷雨的发生、发展和维持提供了有利条件。雷雨过程持续时间长达5小时以上,造成3个航班取消。雷雨前期由500 hPa波动槽东移带来的冷空气与高压外围暖湿气流交汇引起,雷雨中后期主要受700 hPa低涡东移的影响。雷暴云团在水汽积聚的区域发展增强,在水汽流失的区域逐渐消亡。

This paper analyses the weather situation,physical quantity field and flight impact of a long thunderstorm process in Jiuzhai Huanglong Airport on September 25,2021 by using NCEP/NCAR1°×1°reanalysis data,conventional data and Doppler weather radar data.The thunderstorm is affected by 500 hPa wave trough and 700 hPa low vortex.The warm and humid air flow in the bay of Bengal and the South China Sea continues to pull in,and the high-level suction enhances the uplift,which provides favorable conditions for the cumulus,development and maintenance of the thunderstorm.The thunderstorm lasts more than 5 hours,resulting in the cancellation of three flights.In the early stage of thunderstorm,it is caused by the intersection of cold air brought by the eastward movement of 500hPa wave trough and warm moisture flow around the high pressure.In the middle and late stage of thunderstorm,it is mainly affected by the eastward movement of 700 hPa low vortex.Thunderstorm clouds develop and strengthen in the area of water vapor accumulation and gradually disappear in the area of water vapor loss.