摘要
利用地面观测和高空探测资料,对2013年3月23日14时到24日08时两广地区一次大范围强对流天气进行环流背景、物理量诊断等特征分析。结果表明:这次大范围强对流天气过程是发生在天气系统和中尺度系统配合下形成的;天气系统的抬升和辐合上升作用,如高空前倾槽、中低层切变线等天气系统;中尺度系统高低空急流相配合、低空存在干线、弱逆温层、前倾槽结构、高空辐散、中高空干冷空气等条件,促成这次长生命史的强对流天气过程。物理量特征:高层正散度,中、低层负散度;中高空有干冷空气输送,低空有水汽输送、暖平流和水汽辐合区;具备不稳定层结和强垂直风切变。
This paper uses the ground-based observations and upper air sounding data of a large-scale convective weather during 2：00 p.m. March 23 rd to 8：00 a.m. March 24 th, 2013 to analyze the characteristics of this weather process in terms of its circulation background, the physical quantities and etc.. The results show that the large-scale convective weather process formed under the coordination of weather system and rnesoscale system： the uplift and ascending force such as the forward-tilting trough and the middle-and-lower-level shear line in weather system, the coordination of upper-level and lower-level jet streams, the lower-level dry line, the inversion layer, the structure of the forward-tilted trough, the upper-level divergence and the upper-and-middle-level dry-cold air intrusion led to this long-lived strong convective weather process. The characteristics of the physical quantities are as follows： positive divergence in upper level and negative divergence in the middle and lower level, the highaltitude dry cold air transportation and the low-altitude water vapor transportation, warm advection and moisture convergence zone, unstable stratification and strong vertical wind shear.
出处
《清远职业技术学院学报》
2015年第1期63-68,共6页
Journal of Qingyuan Polytechnic
关键词
强对流天气
环流背景
中尺度分析
物理量
广东广西
Strong convective weather
Circulation background
Mesoscale analysis
Physical quantities
Guangdong and Guangxi
