[1]张凌云,刘蕾,王艺,等.一次冰雹天气的数值模拟及地形敏感性试验[J].气象研究与应用,2018,39(02):33-40.
　Zhang Lingyun,Liu Lei,Wang Yi,et al.A numerical simulation of a hail weather and a topographic sensitivity test[J].Journal of Meteorological Research and Application,2018,39(02):33-40.
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一次冰雹天气的数值模拟及地形敏感性试验()
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气象研究与应用[ISSN:1673-8411/CN:45-1356/P]

卷:
第39卷
期数:
2018年02期
页码:
33-40
栏目:
天气气候
出版日期:
2018-06-30

文章信息/Info

Title:
A numerical simulation of a hail weather and a topographic sensitivity test
作者:
张凌云;  刘蕾;  王艺;  李宜爽
柳州市气象局, 广西 柳州 545001
Author(s):
Zhang Lingyun;  Liu Lei;  Wang Yi;  Li Yishuang
Liuzhou Meteorological Bureau, Liuzhou Guangxi 545001
关键词:
干侵入; 强垂直风切变; 地形影响
Keywords:
dry intrusion; strong vertical wind shear; topographic influence
分类号:
P458.1+21.2
摘要:
运用WRF中尺度模式对2012年4月12日柳州市出现的一次冰雹强对流天气过程进行了高分辩率数值模拟，较好地再现了冰雹天气发生的热力和动力机制，在此基础上对柳州市北部山脉作降低和升高处理，运用WRF中尺度模式进行了地形敏感性试验，结果表明：（1）此次冰雹天气过程发生在典型的上干下湿不稳定大气层结中；（2）强对流发生需要较长的能量积累时间，但强对流爆发后能量释放迅速且时间短暂；（3）强对流发生前上升运动和正涡度较弱，且当中层有"干侵入"时会出现较弱的下沉运动，但在强对流爆发时上升运动瞬间突增，正涡度迅速增加，强上升运动和强涡度柱到达对流层上部，并出现强的垂直风切变；（4）地形改变对深厚冷空气的影响不大，地形降低使山脉南部急流强度加大，地形升高使山脉南部急流强度减弱，急流核南落，地形升高也使得动力条件明显增强，对强对流的发生更有利。
Abstract:
Using WRF scaling method, a strong convective hail process in Liuzhou City, on April 12, 2012, was simulated with a high resolution, the thermal and dynamic mechanism of hail weather was reproduced accurately. On this basis, a terrain sensitivity test was conducted by using WRF scale model, in which the height of Liuzhou northern mountains was decreased and increased. The terrain sensitivity test results showed that:(1) the hail weather occurred in a typical upper dry, wet, and unstable atmospheric junction; (2) the strong convection occurred after a long period of energy accumulation, but the energy release was fast and short after that; (3) before the strong convection, there was an upward motion and weak positive vorticity, and a weak downward motion occurred when there was a dry intrusion in the middle; at the outbreak of the strong convection, ascending motion suddenly increased, along with a rapid increase of positive vorticity, the strong upward motion and strong vorticity column reached the upper troposphere and a strong vertical wind shear emerged; (4) the changes of terrain had little effect on the deep cold air; lowering the terrain increased the jet intensity of southern mountain, raising the terrain weakened it and led the jet travel southward, raising the terrain also significantly enhanced the dynamic conditions, making strong convections more likely to occur.

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备注/Memo

备注/Memo:
收稿日期:2018-03-12。
作者简介:张凌云(1975-),女,广西融安人,高级工程师,主要从事天气预报预警工作.E-mail:364548737@qq.com。
更新日期/Last Update: 1900-01-01