广西科学院学报Issue(2)：139-147,154,10.
华南西部高架冰雹强对流天气过程的特征及成因分析
Characteristic and Cause Analysis of Elevated Thun-derstorm Hail Severe Convection Weather in Western South China
摘要
Abstract
Based on conventional observation data,NCEP/NCAR reanalysis data and radar da-ta since 2001,the characteristics of elevated thunderstorm hail severe convection weather in western South China,such as general circulation,temperature,moisture,wind,trigger mecha-nism,uplift mechanism,radar echo features,are analyzed.The results show that:(1 )This weather usually occurred in the cold-air mass where was more than 600 km to the north of the frontal surface and surface air temperature was low in sping.(2)Dry in high levels and wet in low levels,low-level inversion and strong vertical wind shear between 700 hPa and 850 hPa made for the development and maintenance of convective storm. Positive and negative temperature in front of Plateau trough bringing about the increase of vertical temperature lapse rate enhanced convective instability.(3)A strong ascending motion caused by positive vorticity ad-vection eastward-moving in front of Plateau trough was one of the condition which triggered off the contvecion.Warm moist air lifted near 850 hPa,not surface.(4)Lower height of 0℃ level and -20℃ level,thicker frozen layer fraction and little or no CAPE led to small hailstones.(5)There was not very large base re-flectivity,not obvious titlt or overhang echo,high echo height and low VIL.Moreover,in the back of maximum reflectivity along the radial was relatively large spectral width value.关键词
高架冰雹/逆温/触发机制Key words
elevated thunderstorm hail/temperature inversion/trigger mechanism分类
天文与地球科学引用本文复制引用
董良淼,农孟松,梁俊聪,李佳颖,赖珍权,苏洵..华南西部高架冰雹强对流天气过程的特征及成因分析[J].广西科学院学报,2015,(2):139-147,154,10.基金项目
2013年中国气象局预报员专项（CMAYBY2013-050）和广西自然科学基金项目（2012XNSFAA053191）资助。 （）
