摘要
利用玉溪市9个国家气象站和区域自动站观测数据以及ECWMF、T639等数值模式数据,对2016年1月23~25日影响玉溪市的强寒潮天气过程进行了诊断分析。结果表明：此次强寒潮天气过程是横槽转竖带下冷空气,水汽来源主要是孟加拉湾,强冷空气和南支槽前西南气流共同影响为主要影响系统。当水汽辐合的中心由中南半岛移动至玉溪市时,玉溪出现降雪。玉溪市上空大气低层辐合高层辐散,有利于上升运动加强,降雪前明显的上升运动促使大气中的水汽凝结,在地面受强冷空气的影响,温度很低降雪天气就容易发生。玉溪市降雪量较大发生时,0℃层位置低,湿层深厚,中低层有逆温层,中层出现明显的西南急流,中低层风随高度顺转,有暖平流,垂直风切变较为明显,有利于降雪的发生发展。当湿层变薄,风速加大时,地面降雪逐渐停止,转为间歇性小雨。
Use of Yuxi City nine national meteorological stations and regional automatic station observation data and EC, T639 and other numerical model data, diagnostic analysis of strong cold wave weather process in Yuxi City from 23 to 25 Jan 2016. The results show that the strong cold wave weather process is translot turn vertical and turned down cold air, and Water vapor is the main source of the bay of Bengal, the main influencing system is collective effect about the strong cold air and the southwesterly airstream that the ahead of webtisr. When the wa- ter vapor convergence center from the Indochina Peninsula moved to the city of Yuxi, there is snow in Yuxi. low 0~C layer position, deep wet layer, Low level inversion layer, in the middle of the southwest jet stream, the low layer wind clockwise with height, warm advection. The vertical wind shear is more obvious, it Is conducive to the occurrence and development of snow. When the wet layer becomes thinner and wind speed increases, ground snow gradually stopped, to intermittent light rain.
出处
《云南地理环境研究》
2016年第2期73-78,共6页
Yunnan Geographic Environment Research
关键词
玉溪市
寒潮
南支槽
冷空气
Yuxi City
cold wave
Webtisr
cold air
