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| 山东省2006年4月28日飑线天气过程分析 | |
| 引用本文： | 杨晓霞,李春虎,杨成芳,邰庆国,陈优宽,周雪松.山东省2006年4月28日飑线天气过程分析[J].气象,2007,33(1):74-80. |
| 作者姓名： | 杨晓霞 李春虎 杨成芳 邰庆国 陈优宽 周雪松 |
| 作者单位： | 1. 山东省气象科学研究所,济南,250031 2. 山东省气象局 3. 山东省气象台 4. 山东省临沂市气象局 |
| 摘 要： | 对2006年4月28日山东省一次飑线天气过程进行诊断分析，应用湿位涡守恒理论研究了飑线的发展机制。结果表明：飑线是由500hPa西风槽影响产生的，为低层增温增湿，高层冷空气南下，低能舌叠加在高能舌之上，导致大气对流性不稳定。850hPa切变线和地面低压槽中的辐合上升运动触发对流不稳定能量释放，产生中尺度对流云团，在热力不稳定和风垂直切变的环境条件下对流云团东移发展，形成飑线。低层大气湿斜压性增强，破坏了地转平衡，倾斜涡度发展，上升运动增强，对流发展；高空高位势涡度下传使得中低层位势涡度增大，导致其垂直涡度增大，有利于对流层低层中尺度涡旋发展，对流增强。较强的上升运动与风垂直切变相互作用，促使对流系统发展形成飑线，产生雷雨大风。 |
| 关 键 词： | 热力不稳定 辐合上升 风垂直切变 倾斜涡度发展 飑线 雷雨大风 |
| 收稿时间： | 2006/9/26 0:00:00 |
| 修稿时间： | 2006-09-262006-12-05 |
Analysis of a Squall Line Event on 28 April 2006 in Shandong Province |
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| Yang Xiaoxi,Li Chunhu,Yang Chengfang,Tai Qingguo,ChenYoukuan and Zhou Xuesong.Analysis of a Squall Line Event on 28 April 2006 in Shandong Province[J].Meteorological Monthly,2007,33(1):74-80. | |
| Authors: | Yang Xiaoxi Li Chunhu Yang Chengfang Tai Qingguo ChenYoukuan and Zhou Xuesong |
| Institution: | 1. Shandong Meteorological Institute, Jinan 250031 ; 2. Shandong Meteorological Bureau; 3. Shandong Meteorological Observatory; 4, Linyi Meteorological Office, Shandong Province |
| Abstract: | A squall line event on 28 April 2006 in Shandong Province was diagnosed. The developing mechanism of the squall line was studied with the moist potential vorticity conservation theory. The results show that the squall line was caused by 500hPa trough. The low-level temperature and humidity increasing, the cold air behind upper trough moving toward east and south and the low energy tongue located above high energy tongue caused atmospheric convective instability.The air convergence and rising motion produced by shear line at 850hPa and the low pressure trough on the ground triggered convective instable energy release so as to produce convective cloud cell which moved east and developed under the environment conditions of atmospheric thermal instability and strong vertical wind shear, thus forming a squall line. The low-level atmospheric moist baroclinity increasing destroyed geostrophic wind balance and resulted in slant vorticity developing, rising motion increased and convection came into being. High-level high potential vorticity transporting downwards caused the low-level potential vorticity to increase, and to bring about vertical vorticity to increase. All the above factors are propitious to low-level mesoscale vorticity to develop so that convection increased. The interaction between strong rising movement and strong vertical wind shear accelerated convection to develop and form squall line, and cause thunderstorms and gales. |
| Keywords: | thermal instability convergence rising motion vertical wind shear slant vorticity squall line thunderstorm |
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