摘要
利用常规探空资料、NCEP/NCAR再分析资料、地面自动站加密观测资料及T639数值模式资料对2013年6月9-10日发生在玉溪的一次强对流天气进行了诊断分析。结果表明,此次强对流天气是高空槽后西北气流引导冷空气南下并与西南暖湿气流在云南中北部交汇引发的,对流层低层切变线和地面中尺度辐合线、气旋式辐合中心等是此次强对流天气的直接影响系统。其水汽主要源于孟加拉湾,水汽在低层集中和输送并在云南等地上空辐合,为此次强对流天气的发生提供了有利的水汽条件。中尺度强对流云带与地面中尺度辐合系统及对流有效位能(CAPE)不连续带有较好的对应关系,中尺度强对流云带发生、发展的位置和走向与前期地面辐合线基本一致,对流单体在CAPE不连续带大值区一侧容易加强和发展。综合分析地面流场和高分辨CAPE的分布,对强对流天气的短时临近预报有一定指示意义。
By using routine sounding data,NCEP/NCAR reanalysis data,automatic weather station observation data and T639 numerical model forecast data,a strong convection weather process occurred in Yuxi in 9-10 June 2013 is diagnosed.The results show that this strong convection weather process was caused by the interaction of the warm-wet flow coming from southwest and the cold air from north guided by the northwest flow behind trough,occurred in the north of the middle Yunnan Province.The direct impact systems of this process are shear line in the lower troposphere,surface mesoscale convergence line and the cyclone type convergence center.Convergence of the water vapor from the Bay of Bengal in Yunnan attributes favorable vapour condition to this process.Analysis shows that there is a good corresponding relationship in the mesoscale severe convective cloud band,surface mesoscale convergence system and the discontinuous band of the convective available potential energy(CAPE).The location where the mesoscale convective band generate and develop is essentially consistent with the surface convergence line which formed early.The convective cell is more easily to get strengthened and developed on the large value area of the discontinuous band of CAPE.Thus the comprehensive analysis of surface flow field and high-resolution distribution of CAPE have a certain indicative significance to the short-term weather forecast of the severe convective weather.
出处
《高原气象》
CSCD
北大核心
2015年第5期1391-1401,共11页
Plateau Meteorology
基金
云南省气象局预报员专项(YB201304)
关键词
强对流
中尺度辐合线
高分辨率
CAPE
Severe convection
Mesoscale convergence line
High resolution
CAPE
