青藏高原东北侧一次超级单体雹暴的多普勒雷达资料分析

Analysis of Doppler Radar Data about a Super Monomer Hailstorms in the Northeastern Qinghai-Tibet Plateau

[目的]分析青藏高原东北侧2010年9月6日发生在兰州市中川机场的一次由超级单体形成的雹暴过程的多普勒雷达资料。[方法]从常规资料和雷达资料两方面对2010年9月6日发生在兰州市中川机场附近的低涡切变线型、超级单体形成的雹暴过程加以分析,其中主要运用多普勒雷达的基本产品和二次产品对这次过程中出现的诸多表征强对流天气的特点进行分析,探讨此次过程的一些特征。[结果]这是一次由中高层500 hPa的冷涡中脱离的一小股冷空气提供冲击力,低层700 hPa的暖式切变线供应水汽和能量,且在高空有急流配合的强对流天气过程;这种长达10 min降雹的天气现象在西北干旱地区较为罕见。此次过程强对流的特征明显,具有较好的典型性;阵风锋现象没有以窄带回波的形式表现出来,但以另外一种"强锲入"的方式展现;此次过程有界弱回波区(BWER)和中尺度气旋特征均十分明显,且这是一次典型的超级单体导致的雹暴过程。[结论]该研究为预报兰州市中川机场的强对流天气提供一些有益的借鉴。

[Objective] The Doppler radar data about a super monomer hailstorms in the northeastern Qinghai-Tibet Plateau in the Zhongshan Airport in the Lanzhou City on September 6,2010 was studied.[Method] By dint of routine data and radar data,the low vortex shear line type and the super monomer hailstorm around the Zhongshan airport in the Lanzhou City on September 6,2010were expounded.Basic product and secondary product of Doppler radar were used in this process to reflect the characteristics of strong convection weather.Some characteristics of this process shall be explored.[Result] A small gush of cold air from the cold vortex of 500 hPa in the middle and high layer provided impacts.The warm shear line provided water vapor and energy in the 700 hPa.There was strong convective weather in the upper air.Such 10 minutes of hailstorm was rarely seen in the drought land in the northwest.The characteristics of the strong convection were distinct and typical.The front showed no echo form.However,it can not be reflected in ＂strong wedge＂ in another form.In this process,characteristics of BWER and middle scale cyclone were distinct.And this was a typical hailstorm process caused by super monomer.[Conclusion] The study provided some helpful references for the forecast of strong convection weather in the Zhongshan airport in Lanzhou City.