甘肃临夏地区2次沙尘寒潮天气成因对比  

Contrast Analysis of Two Cold Wave Weather Processes with Sand Dust in the Middle Region of Gansu Province

作　　者：孙玉莲[1,2] 任余龙 韦伯龙 张立禄 马新荣 

机构地区：[1]中国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中国气象局干旱气候变化与减灾重点开放实验室,甘肃兰州730020 [2]甘肃省临夏州气象局,甘肃临夏731100

出　　处：《干旱气象》2013年第1期150-155,162,共7页Journal of Arid Meteorology

基　　金："十一五"国家科技支撑计划重点项目沙尘暴遥感监测与预报集成技术研究(2008BAC40B04-2)资助

摘　　要：利用常规天气资料和数值预报产品,应用天气分析和天气诊断方法,对甘肃中部临夏地区出现的2次沙尘、寒潮天气过程对比分析,结果表明:冷空气活动是沙尘、寒潮天气的主要动力来源,高空急流是大风的动量来源;地面冷锋是触发2次天气过程的重要系统。但由于2次过程中,冷空气的源地,高空槽位置、强度,高低空冷暖平流的空间配置,急流位置的不同,所造成的影响范围、强度和受灾情况也有较大的差异;同时位涡在2次过程中也有很好的表现。The two cold wave with sand dust weather processes ocurred in the middle region of Gansu Province were analyzed and contrasted by using meteorological data and numerical products.The results showed that the cold air activity and upper-level jet stream were the dynamical reason for this two weather processes,and the cold front on the ground was the important weather system which induced the two weather cases.Because of the different sources of cold air,different position and intensity of high level trough,different configuration of high and the low temperature avection and different position of jet,the influencing region,the intensity and the disaster situation of two cold wave weather processes were not the same.In addition,the potential vorticity had good indication in two cases.

关 键 词：沙尘 寒潮 触发成因 天气诊断 临夏 甘肃 

分 类 号：P458.122[天文地球—大气科学及气象学]