摘要
利用常规观测资料、FY-2C卫星资料以及NCEP再分析资料,对2008年10月12-14日发生在海南的一次大暴雨过程进行分析。结果表明:本次大暴雨过程是由热带低压带来的暖湿气流与大陆冷高压带来的干冷空气共同作用产生的,副热带高压的进退起着至关重要的作用。假相当位温及地面总能量的分布很好地反映了此次大暴雨过程中的强对流不稳定及冷暖空气交汇的形势。中低层螺旋度的水平分布及演变情况与热带低压的移动及强度变化有很好的对应关系,暴雨区上空螺旋度对应上负下正的垂直分布形势。
By using conventional observational data,FY-2C satellite data and NCEP reanalysis data,the heavy rain during October 1214,2008 in Hainan province is analyzed.The results show that the heavy rain generated by the combined effect of the warm and wet flow of tropical depression and dry and cold air of continental cold high.And the advance and retreat of the subtropical high also played a vital role.The pseudo-equivalent potential temperature and the ground total energy distribution well reflected strong convective instability and convergence of the cold and warm air in the process of heavy rain.The helicity distribution and evolution in the lower and middle level had a good relationship with the movement and intensity change of the tropical depression,the vertical distribution situation of helicity was negative in the higher levels and positive in the lower levels over the heavy rain zone.
出处
《气象与环境科学》
2011年第1期36-41,共6页
Meteorological and Environmental Sciences
关键词
暴雨
能量
螺旋度
分布特征
heavy rain
energy
helicity
distribution character
