摘要
2012年11月11—12日黑龙江省出现了一次大范围暴雪天气过程。文章利用常规资料、区域自动气象站、NCEP1o×1o资料对其环境条件进行分析,探讨了天气形势特征以及物理量场与暴雪落区的对应关系。结果表明:500h Pa低涡和地面江淮气旋是此次暴雪天气过程的主要影响系统。在低涡暖湿切变与低空偏东急流出口区左侧出现暴雪。同时强降雪出现在850 h Pa涡度和200 h Pa散度大值区内;强上升运动大值区的位置及移动与暴雪过程的时空演变基本一致。低空西南急流和东南风急流使得暖湿气流被源源不断地输送到黑龙江省,并得以聚集,从而为降雪增强提供了有利条件。
Using basic observational data and NCEP reanalysis data in the process of snowstorm from November 11 to 12 in 2012 in Heilongjiang province, the relationships between the characteristics of synoptic situation, the related physical field and the main falling areas of very heavy storm were discussed in this paper. The results showed that the developed low vortex of 500hpa and Jianghuai ground cyclone were the key influence systems in this process. Heavy snowstorm appeared in warm and wet shear of low vortex and left region of the low-level jet stream exit, and also occurred in large value region of 850hpa vortex area and 200hpa di- vergence area. The site and migration of large value area of strong ascending motion was basically same time of the blizzard spatial and temporal evolvement. The low-level southwest jet and southeast jet makes the warm moist air flow transport and gather at Hei- longjiang, providing favorable conditions for enhanced snowfall intensity.
出处
《内蒙古气象》
2015年第1期14-17,共4页
Meteorology Journal of Inner Mongolia
关键词
特大暴雪
东北冷涡
急流
上升运动
heavy snowstorm
northeast cold vortex
jet
ascending motion
