| 辽宁建平地区一次突发性强冰雹天气的中尺度特征分析 |
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| 引用本文： | 刘 静,任 川,牛 丹,时 倩.辽宁建平地区一次突发性强冰雹天气的中尺度特征分析[J].农学学报,2018,8(9):44-51. |
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| 作者姓名： | 刘 静 任 川 牛 丹 时 倩 |
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| 作者单位： | 辽宁省气象灾害监测预警中心 沈阳,辽宁省气象信息中心 沈阳,辽宁省气象信息中心 沈阳,辽宁省气象信息中心 沈阳 |
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| 基金项目： | 辽宁省气象局年度研究项目“冰雹客观化分级预警技术研究”(201606)和“辽宁省气象灾害监测预警中心2017 年基层气象风险预警服务标 准化建设”项目共同资助。 |
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| 摘 要： | 研究旨在通过对辽宁省冰雹高发地区的一次典型强雹暴过程进行中尺度特征分析,寻找致雹物理参量特征及雷达临近预警指标,以期为冰雹短临预报预警提供参考。方法]利用常规气象观测资料、葵花卫星、多普勒天气雷达、NCEP/FNL等资料,对发生在辽宁建平地区一次强冰雹天气的天气形势及中尺度特征进行了详细分析。结果]结果表明：此次冰雹过程发生在较强的风切变环境场中,850 hPa与500 hPa风向切变>90°,850 hPa与500 hPa之间的温度差>26℃,大气层结不稳定；冰雹发生在强对流云团发展至成熟阶段初期,在可见光云图上可以看出明显的纹理和暗影,TBB较长时间维持在-50℃以下,冰雹发生后, TBB梯度值迅速减小；强降雹超级单体呈现弓状,除了具有入流边界、回波悬垂等雷达特征外,还具有高悬的反射率因子核心,即＞55 dBZ高度伸展到-20℃以上,以及VIL>60kg.m-2,VIL密度>4g.m-3,深厚持久的中气旋维持超级单体内部涡旋等特征。结论]该研究提供了辽宁省冰雹发生临近时刻的环境参量特征及雷达指标阈值,为确定冰雹短临预报预警技术规范奠定了坚实的基础。
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| 关 键 词： | 人口容量 人口容量 新型城镇化 对策 宁夏 |
| 收稿时间： | 2018/1/5 0:00:00 |
| 修稿时间： | 2018/4/3 0:00:00 |
Mesoscale Characteristics Analysis: A Sudden Severe Hail in Jianping, Liaoning |
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| Abstract: | Mesoscale analysis was conducted on a severe hail event in Jianping of Liaoning, the physical parameters of the hail and impending warning indexes of radar were analyzed to provide reference for shortimpending warning of hail. Based on conventional meteorological data, Himawari- 8 data, Doppler weather radar data and NCEP/FNL reanalysis data, we analyzed the synoptic situation and mesoscale characteristics. The results showed that: with strong vertical wind shear, wind shear between 850 hPa and 500 hPa was above 90°, the temperature between 850 hPa and 500 hPa was higher than 26℃. There was hydrostatic instability. The hail happened in the initial development of strong convective cloud to mature stage, and at this time the cloud generally showed the texture and umbra. The TBB was less than -50℃ for a long time. When the hail happened, TBB value declined rapidly. The super cell storms were bow shape, which had the radar characteristics of inflow boundary and echo areas, it also had high reflectivity core, the reflectivity greater than 55 dBz reached to -20℃, VIL value was higher than 60 kg/m2 and VIL density value was over 4 g/m3, the everlasting mid- latitude cyclone maintained the vortex character in super cell. The results show the environmental parameter characteristics and threshold value of radar index, providing reference for shortimpending warning of hail. |
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| Keywords: | Hail Himawari-8 Doppler weather radar TBB gradient VIL density |
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