Analysis of an enhanced mountain-to-plain convective storm based on potential divergence and the advection of potential instabilityOA
Analysis of an enhanced mountain-to-plain convective storm based on potential divergence and the advection of potential instability
针对2021年5月22日发生在北京地区的一次雷暴下山增强的过程,利用WRF模式进行高分辨率数值模拟.在成功模拟下山对流发生,增强和移动的基础上,对该过程中位势不稳定特征以及引起位势稳定度变化的原因进行诊断分析.研究结果表明,广义位温在识别由潜热加热与蒸发冷却引起的不稳定性变化方面,优于传统的位温和相当位温.通过对位势稳定度趋势方程的诊断分析发现,局地位势不稳定的变化主要受位势散度和位势不稳定平流的主导,两者在空间呈反位相分布.在强降水开始前,强烈的下沉气流将高层的不稳定空气输送到较为稳定的低层,导致近地面不稳定性增加,为强降水的形成提供了有利条件.在强降水阶段,低中层大气层结稳定,同时倾斜上升气流和下沉气流之间的垂直辐散导致了大气向不稳定变化,维持了对流的持续发展.在强降水的前沿,主要由垂直平流驱动不稳定性增加,低层不稳定空气被向上输送,增强了高层的不稳定性.
Wenjing Cheng;Daoyong Yang;Lingkun Ran;Kuo Zhou;Yanli Chu
Key Laboratory of Cloud-Precipitation Physics and Severe Storms,Institute of Atmosphere Physics(LACS),Chinese Academy Sciences,Beijing,China||University of Chinese Academy of Sciences,Beijing,ChinaUnit 63796 of the PLA,Xichang,ChinaKey Laboratory of Cloud-Precipitation Physics and Severe Storms,Institute of Atmosphere Physics(LACS),Chinese Academy Sciences,Beijing,ChinaDepartment of Aviation Meteorology,College of Air Traffic Management,Civil Aviation University of China,Tianjin,ChinaInstitule of Urban Meteorology,CMA,Beijing,China
雷暴下山广义位温位势散度位势稳定度倾向方程降水
Mountain-to-plain convective stormsGeneralized potential temperaturePotential divergenceTendency equation of potential stabilityPrecipitation
《大气和海洋科学快报（英文版）》 2026 (2)
20-27,8
This research was funded by the Beijing Municipal Science and Technology Commission[grant number Z221100005222012],the De-partment of Science and Technology of Hebei Province[grant num-ber 22375404D],the Strategic Priority Research Program of the Chi-nese Academy of Sciences[grant number XDB0760303],the National Natural Science Foundation of China[grant numbers U2233218 and 42275010],and the Open Foundation of the Key Open Laboratory of Urban Meteorology,China Meteorological Administration[grant num-ber LUM-2023-06].This research was supported by the National Key Scientific and Tech-nological Infrastructure project"Earth System Numerical Simulation Fa-cility"(EarthLab,https://cstr.cn/31134.02.EL).
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