摘要
利用高分辨率 η坐标模式 ,以一个实际飑线个例的常规资料为初值 ,通过嵌入一定强度的边界中层尺度辐合线 ,进行了边界层辐合线型飑线激发的数值试验。结果表明 :飑线实例的大尺度环境场提供了累积的有效浮力能 ,小尺度积云对流则通过对流翻腾提供高层水汽凝结潜热加热和低层降温冷却 ,而中尺度幅合线通过提供带状辐合上升运动 ,起着胚胎和组织积云对流的作用。这样大、中。
Based on the conventional data of a actual case of squall line and inserted certain intensity PBL convergence line,numerical trial of motivation of squall line of PBL convergence line type is made by using improved high resolution ETA model.The result shows that macro scale cumulus convection field provides condensation heating in upper layer and temperature dropping in lower layer by convecting and churning,meso scale convergence line plays roles of embryo and organization effect by means of providing banded convergence ascending motion.Such an interaction among macro scale,meso scale and micro scale results in meso scale convergence line developing to squall line.
出处
《气象科学》
CSCD
北大核心
2001年第3期308-315,共8页
Journal of the Meteorological Sciences
基金
国家自然基金项目 4 974 5 0 0 7的资助
关键词
边界层辐合线型飑线
高分辨率η模式
数值试验
大尺度环流场
大尺度积云对流
Squall line of PBL convergence line type High resolution ETA model Numerical trial Interaction among macro scale,meso scale and micro scale
