摘要
分析了黄土高原东部一次台风与河套低涡共同影响的陕北暴雨,结果表明:深厚、稳定的河套低涡低层辐合、高层辐散的垂直结构及位势不稳定等特征为暴雨区附近强烈上升运动的发展和维持提供了有利的环境条件。低空台风低压环流北侧偏东风气流形成的水汽和能量通道在地处内陆的陕北地区产生强水汽辐合,并导致不稳定能量的积蓄和释放,直接造成了台风外围远距离暴雨的发生。暴雨的形成与地面流场上中尺度辐合系统、卫星云图上中β尺度对流系统(MβCSs)等密切相关。
Through the analysis of influence of a typhoon and meso-scale vortex in Inner-Mongdia irrigation area of Yellow River on rainstorm the north of Shaanxi, the results are as follows. The vertical structure of convergence-divergence from low-level troposphere to high level and unstable air in Hetao low eddy provide advantageous conditions for development and maintenance of upward current near rainstorm area. The vapour and energy channel formed east-ward wind current on the north side of lowpressure circulation of low-level tynoon product the severe vapour convergence in North Shaanxi and result in the accumu lation and release of unstable energy that directly cause the rainstorm far from tynoon. The rainstorm forming is closely related to the mesoscale convergence system in surface stream field and meso β-scale convective system in satellite cloud picture.
出处
《高原气象》
CSCD
北大核心
2006年第1期52-59,共8页
Plateau Meteorology
基金
科技部社会公益项目(2001DIB200095)资助
关键词
台风
河套低涡
MβCSs
陕北暴雨
Typhoon
Mesorscale vortex in Inner-Mongdia irrigation area of Yellow River
MβCSs
Rainstorm in north Shaanxi
