摘要
利用NCEP/NCAR6h一次的全球同化系统分析资料,针对2006年发生在江苏冬季的两次不同量级的降雪,着重分析和讨论了天气形势和物理量场。结果表明:暴雪产生在低空急流的左前方和700hPa切变线的风速辐合区中,水汽通量散度的辐合区和上升运动场的合理配置是暴雪产生的重要原因。通过这两次不同量级降雪的对比分析,得到,无论是在急流的强度还是在物理量场上,中雪和暴雪有着明显的区别。
Based on the global analyzed data assimilation system of NCEP/NCAR for every 6 hours, the paper has discussed and analyzed weather situation and physics fields by studying the two snowfalls of different orders in the winter of 2006 in Jiangsu. The results suggest that heavy snow develops in the front of low-level jet on the left side and in the convergence field of wind velocity of shear line at 700 hPa, and that heavy snow results from the proper allocation of convergence field of moisture flux divergence and ascending motion field. It is concluded through the contrastive analysis of the two snowfalls of different orders that moderate and heavy snows have evident differences in terms of jet intensity and physics field.
出处
《气象科学》
CSCD
北大核心
2009年第3期398-402,共5页
Journal of the Meteorological Sciences
基金
江苏省重大科技支撑与自主创新示范工程项目(BE2008618)
关键词
暴雪
物理量场
对比分析
Heavy snow Physics field Contrastive analysis
