| 天山北坡中部一次强对流天气中小尺度系统特征分析 |
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| 引用本文： | 赵俊荣,晋绿生,郭金强,杨景辉.天山北坡中部一次强对流天气中小尺度系统特征分析[J].高原气象,2009,28(5):1044-1050. |
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| 作者姓名： | 赵俊荣 晋绿生 郭金强 杨景辉 |
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| 作者单位： | 新疆石河子气象局,新疆,石河子,832000 |
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| 摘 要： | 利用Doppler雷达资料, 结合常规观测资料及T213再分析资料， 对2008年8月26日18:00~19:30发生在天山北坡中部石河子南部山区强对流天气的影响系统和中小尺度强对流天气落区形成的原因进行了详细分析。结果表明： 西伯利亚至巴尔喀什湖冷槽东南象限分裂出的中尺度短波是造成“2008.8.26”强对流天气过程的直接影响系统； 地形辐合回波带是造成这次过程的主要系统； 地形辐合回波带上的中-γ对流单体滚动更迭是强对流天气落区形成的直接原因； 中高层干冷、 低层暖湿， 低层中尺度辐合切变线对强对流天气的发生具有重要作用。回波强度、 回波顶高度的迅速增加、 垂直累积液态水含量的跃增和面积的扩大， 中气旋的出现都对“2008.8.26”强对流天气的发生具有预警指示意义。当回波强度>50 dBz、 回波顶高度>8 km、 垂直累积液态水含量急增到50 kg·m-2以上时， 将预示有强对流天气出现。垂直累积液态水含量的大值区是对流云强度最强的地方， 与强对流天气落区相对应； 其高值区的强度和范围与强降水的强度和范围成正比。在暴雨发生前和发生期间落区附近近低层存在着西南暖湿气流向暴雨中心的输送。
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| 关 键 词： | 局地强对流 中小尺度系统 地形辐合回波带 中气旋 |
Analysis of Meso-Small Scale System Characteristics of a Severe Convective Weather on North Slope of Tianshan, Xinjiang |
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| ZHAO Jun-rong,JIN Lu-sheng,GUO Jin-qiang,YANG Jin-hui.Analysis of Meso-Small Scale System Characteristics of a Severe Convective Weather on North Slope of Tianshan, Xinjiang[J].Plateau Meteorology,2009,28(5):1044-1050. |
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| Authors: | ZHAO Jun-rong JIN Lu-sheng GUO Jin-qiang YANG Jin-hui |
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| Abstract: | The influence system of severe convective weather and dynamical mechanism of meso-small scale severe convective weather are analyzed in Shihezi area on the north slope of Tianshan, Xinjiang from 18:00 to 19:30 on 26 August 2008， using the Doppler radar data, routine observation data. and T213 data. The results showed that the mesoscale shortwave splitted cold groove southeast quadrant from Siberian to Balkhash Lake was the direct influence system in "20080826" severe convection weather; landform convergence echo belt is main system in this weather process; meso-γ convection monocase rolled pile up was efficient amse of region where Revere convection weather formed; middle-high layer dry and cold, low layer warm and wet, low layer mesoscale convergence shear played an important role in occurring of the weather, echo intensity and echo peak rapid increased， uprightness integral liquid state water content rapid increased and acreage expanded， small cyclone appeared had presentiment for severe convection weather. When echo intensity>50 dBz, echo peak>8 km, uprightness integral liquid state water content>50 kg·m~(-2), it was foretell that severe convection weather would appear. Uprightness integral liquid state water content high value region where convection cloud was stronger, and it corresponding where severe convection weather happened. The intensity and range of high value region in direct proportion to heavy precipitation. Before and during the rainstorm occurring southwest warm and wet air current transportated from low layer where rainstorm occurring to rainstorm center. |
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| Keywords: | Local evere convection Meso-small scale systems Landform convergence echo belt Mesocyclone |
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