陇东地区一次强冰雹过程的稳定度分析  

Stability analysis of a heavy hail process in East Gansu Region

作　　者：岳平[1,2,4] 李栋梁[3] 刘洪兰 

机构地区：[1]中图气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室,甘肃兰州730020 [2]甘肃省酒泉市气象局,甘肃酒泉735000 [3]中国科学院寒区早区环境与工程研究所,甘肃兰州730000 [4]张掖国家气候观象台,甘肃张掖734000 [5]甘肃省张掖市气象局,甘肃张掖734000

出　　处：《自然灾害学报》2008年第3期158-162,共5页Journal of Natural Disasters

基　　金：西部开发科技行动重大项目(编号:2004BA901A16)资助

摘　　要：从天气系统、稳定度指数、动力、热力和水汽条件等方面对2005年5月30日15时16分在平凉地区范围内的冰雹天气过程进行了分析。结果表明:高空槽后冷平流使对流层中上层降温,加大了垂直方向的温度梯度,从而促进了对流的发展;大气层结的不稳定、动力热力共同作用以及充足的水汽输送是强雷暴天气形成的必要条件。Based on the weather system, stability index, dynamic, thermodynamic power and water vapor conditions, the heavy hail event in Pingliang area on May 30,2005 was analyzed. The results show that cold advection behind the upper trough makes the middle and high level air colder, which increases the temperature gradient in vertical direction and accelerates the development of convention. The instability of atmosphere, coaction of dynamic and thermodynamic power, and water vapor transmit conditions are necessary condition to induce thunderstorm.

关 键 词：冰雹 天气系统 稳定度指数 

分 类 号：P458[天文地球—大气科学及气象学]