天山北坡"20080826"超级单体的Doppler雷达资料分析

利用石河子C波段Doppler雷达资料,对2008年8月26日下午至傍晚发生在天山北坡带中部石河子垦区全区性的一次强对流天气过程进行分析,结果表明:引起这次全区性的强对流天气风暴具有超级单体风暴的特征.这个超级单体南边出现明显的出流边界,并位于弧形回波带的南部.组合反射率因子垂直剖面图上呈现出有界弱回波区、回波悬垂和有界弱回波区左侧的回波墙,最大回波强度出现在沿着回波墙的一个竖直的狭长区域,其值达到65 dBZ、位于回波墙中上部.在中低层径向速度图上,弧形回波带的北部出现辐合区,其东南部呈现出一个中尺度气旋,旋转速度达到20 m/s,风暴顶为强烈辐散,正负速度差值达52m/s,其中3 000～6 000 m之间表现最为典型;与中气旋对应的回波强度和回波顶高以及垂直液态含水量都在暴雨中心附近达到最大.50dBz的回波顶高达9.8 km、宽度约10 km,60 dBz的回波顶高达到8.7 km、宽度约7 km,65 dBz的回波顶高达到8.0 km、宽度约2 km,垂直液态含水量从16:16的8 kg/m跃增到17:34的70 kg/m,该超级单体的移动方向在盛行风向的右侧约30°,属于右移风暴.

Supercell storm at north slope with Doppler weather radar data of Tianshan Mountains on August 26,2008

Using Shihezi C wave band Doppler Radar Weather data and conventional weather data by weather dy-namics and radar meteorology Analyzed the supercell storm which occurred on 26 August,2008 in Shihezi area. The results showed it was a typical feature of supercell storm. There was a out - flows lying to the south of the arc echo. The correspond - ing low to middle elevations radial velocity maps showed a mesocyclone, with rotation velocity over 20 m/s. At the top of the supercell storm,was strong divergenced,with the difference between the positive and neg-ative elocity attaining 52 m/s. And the most typical of mesocyclone was in the range from 4 000 m to 9 000 m.Echo intensity, echo peak and liquid state water content which collected mesocyclone reached the maximum. Echo peak intensity 50dbz gone beyond 9.8 km, and its width was about 10 km. And Echo peak intensity 60dbz was 8.7 km ,its width was about 7 km. Echo peak intensity 65dbz was 8.0 kin,and its width was about 2 km. Uprightness integral liquid state water content reached 70 kg · m~(-2)at 17:34,but it was 8 kg · m~(-2) at 16:16. The supereell moved to 30° right to the mean wind,so it was a rightmoving supercell storm. Supercell storm is the main influen-cing system of weather disaster in Shihezi area. Many discussion and analysis had been done on new generation weather radar data analysis and application in our country. Supercell storm as the impetuous form for local convec-tive storm, it is a hot object for meteorologist at all times. Zheng yuan -yuan, Yu xiao -ding et al. Gave a detailed analysis for a typical supercell storm of Doppler weather radar data; Liao yu - fang, Yu xiao - ding et al. Analyzed a strong convective storm series exemple of Doppler weather radar data; Zheng yuan - yuan, Yu xiao -ding et al. An-alyzed on tornado by new generation weather radar on 8 July 2003 in Anhui ; Wang ang - sheng, Xu nai - zhang ana-lyzed strong monocase hail storm. In this paper we have detailed analysis about strong convective weather such as entirely thunderstorm, gale, partial hailstone and rainstorm which occurred from 17:30 to I9:30 on 26 August ,2008 in Shihezi area. Thereby it can give more reason about mechanism of strong convective weather come into being,it is important for draw near strong convective weather forecast vs alarm,prevent and decrease disaster.