内蒙古通辽市大到暴雪过程的雷达回波特征分析

Radar Echo Characteristics Analysis of Snowstorm Process in Tongliao of Inner Mongolia

利用雷达观测资料,对2007—2013年内蒙古通辽市发生的大到暴雪过程的雷达回波特征进行了探讨和分析。结果表明,距离强降雪发生时间越近,回波范围越大,最远范围可达260 km,回波连续性也越好,呈均匀的片状分布,结构比较密实,且强度也越强;距离强降雪发生时间越近,回波顶的高度就越高,湿层最高高度也越高;在强降雪发生的临近时段,绝大多数个例在0.6~3.4 km高度上开始存在低空急流,并且风速随高度逐渐增大。该研究结果可为通辽市降雪的短时、临近预报提供科学依据。

The radar echo characteristics of selected blizzard cases occurred from 2007 to 2013 in Tongliao of Inner Mongolia were analyzed based on the radar observation data. The results showed that with the time closer to the occurrence of blizzard, the echo range became wider and the farthest range could reach 260 km. During the period, the continuity of echo was complete and the echo distributed in uniform patchy; the structure and intensity of the echo were dense and strong. In the near period of occurrence of blizzard, both of the echo top height and wet layer top height became higher,the low-level jet emerged in the height of 0.6-3.4km in most of cases, and the speed of the winds was increased with the incensement of height. The results of this study may provide scientific basis for the short-term weather forecast in Tongliao.