黄小刚,费建芳,孙吉明,程小平. 2017. 2013年冬季长江中下游地区一次高架雷暴过程的成因分析[J]. 气象学报, ():-, doi:10.11676/qxxb2017.031
2013年冬季长江中下游地区一次高架雷暴过程的成因分析
Analysis on the Formation Mechanism of Elevated Thunderstorm along Middle and Lower Yangtze Basin during February 2013
投稿时间:2016-02-29  最后修改时间:2017-02-21
DOI:10.11676/qxxb2017.031
中文关键词:  高架雷暴,△M调整,对称不稳定,地形强迫,锋面抬升
英文关键词:Elevated  thunderstorm, Delta-M  adjustment, Conditional  symmetric instability(CSI), Topographic forcing, Frontal  lifting
基金项目:国家自然科学基金;国家重点基础研究发展计划
作者单位E-mail
黄小刚 解放军理工大学气象海洋学院 huang.x.g@163.com 
费建芳 解放军理工大学气象海洋学院 feijf@sina.com 
孙吉明 空军航空大学航空理论系 sjming@126.com 
程小平 解放军理工大学气象海洋学院 x.p.cheng@163.com 
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中文摘要:
      综合应用常规观测资料、再分析资料、多普勒雷达观测资料等多源数据,分析研究了2013年2月发生在长江中下游地区一次高架雷暴过程的形成机制。研究结果表明,此类高架雷暴过程发生在冷锋后部对流稳定的环境大气中,其主要形成过程为:首先气块在地形强迫和锋面抬升作用下产生垂直运动,由于对流稳定环境大气的抑制,气块只能到达较低的中性浮力高度并产生与环境大气之间的绝对地转动量差△M,在△M调整机制作用下自低层抬升的气块将产生沿等熵面的惯性加速度从而加强了倾斜运动,当暖湿气流沿锋面爬升至700hPa左右时,在辐合切变线和高低空急流耦合等的共同作用下,倾斜运动进一步加强,并在此过程中产生对称不稳定并通过反馈机制促进倾斜运动的进一步发展。在地形强迫和锋面抬升的基础上,△M调整与对称不稳定的共同作用使得冷锋后部锋区上空产生旺盛的倾斜运动,倾斜运动的持续发展使对流得到组织化产生带状的对流云和降水带,最终形成了雷暴等强对流天气。 总之,在对流稳定的环境大气条件下,由于地形强迫和锋面抬升、△M调整、辐合切变线和高低空急流耦合以及对称不稳定等机制的联合作用激发了倾斜对流运动的强烈发展,使倾斜对流有效位能大量累积并释放,最终形成了此次冬季高架雷暴天气过程。
英文摘要:
      This paper research an elevated thunderstorm process occurring in the middle and lower reaches of the Yangtze River region in February 2013, many data are used as the conventional observation data, reanalysis data and Doppler radar data. The results show that such elevated thunderstorm formed and stayed above and behind the surface cold front, its evolution process is: first of all, the parcel in the vicinity of cold front was lifted up by the topographic and frontal forcing, due to the inhibition of convection stable atmospheric environment, the parcel only reached the lower height of neutral buoyancy. As the parcel ascends, it conserves its potential temperature and geostrophic absolute momentum, so an absolute momentum anomaly(△M) between the parcel and the atmosphere at the level of neutral buoyancy has been generated by vertical convection in the baroclinic atmosphere. The parcel then experiences an inertial acceleration and the inertial adjustment occurred along a neutral buoyancy surface. Which forces the parcel move along a slantwise path and the △M-adjustment circulations are formed. After the △M-adjustment produced, the conditional symmetric instability (CSI) was generated. The △M-adjustment and CSI circulations promote the development of slantwise convective above the cold front together. In a word, the interaction of the topographic and frontal forcing, atmospheric stability, △M-adjustment and CSI has greatly promoted development of slantwise convection, which released the slantwise convective available potential energy and caused this elevated thunderstorm process.
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