| 海门一次F1级龙卷的多普勒天气雷达特征分析 |
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| 引用本文： | 林应,陈铁,张树民,缪燕,严晓庆.海门一次F1级龙卷的多普勒天气雷达特征分析[J].气象科学,2012,32(S1):126-133. |
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| 作者姓名： | 林应 陈铁 张树民 缪燕 严晓庆 |
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| 作者单位： | 南通市气象局, 江苏 南通 226006;南通市气象局, 江苏 南通 226006;南通市气象局, 江苏 南通 226006;南通市气象局, 江苏 南通 226006;南通市气象局, 江苏 南通 226006 |
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| 摘 要： | 用多普勒天气雷达、常规观测和地面加密观测资料对2011年7月13日发生在江苏南通海门市树勋镇的龙卷风过程进行了详细分析。得出:较长时间的不稳定层结的存在,较低的抬升凝结高度,较强的水平和垂直风切变以及地面干线的存在为龙卷风的发生发展提供很好的动力条件;底层冷空气的切入,较强的风切变易使单体发展更加旺盛。强回波中心高度和垂直积分液态含水量的下降,径向速度风场中气旋性涡旋的迅速发展是对龙卷风提前警戒的很好指标。龙卷风进行过程中,此系统为低位质心的对流系统,产生的天气是龙卷,伴随大风,与冰雹的高位质心对流系统有明显的区别。中气旋高度,最大切变高度的骤降,中气旋尺度的急剧收缩预示着龙卷的发生,为我们今后的龙卷风预警提供有利的参考。
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| 关 键 词： | 龙卷 中气旋 地面干线 小尺度涡旋特征 |
Analysis on Doppler radar characteristic of grade F1 tornado in Haimen |
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| LIN Ying,CHEN Tie,ZHANG Shumin,MIAO Yan and YAN Xiaoqing.Analysis on Doppler radar characteristic of grade F1 tornado in Haimen[J].Scientia Meteorologica Sinica,2012,32(S1):126-133. |
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| Authors: | LIN Ying CHEN Tie ZHANG Shumin MIAO Yan and YAN Xiaoqing |
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| Institution: | Nantong Meteorological Bureau, Jiangsu Nantong 226006, China;Nantong Meteorological Bureau, Jiangsu Nantong 226006, China;Nantong Meteorological Bureau, Jiangsu Nantong 226006, China;Nantong Meteorological Bureau, Jiangsu Nantong 226006, China;Nantong Meteorological Bureau, Jiangsu Nantong 226006, China |
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| Abstract: | By using the Doppler weather radar, routine and intensive observation data the process of a grade F1 tornado happened in Haimen of Jiangsu province was analyzed in detail. The results show that before the tornado there existed a long entrainment instability, a low LCL, a strong horizontal and vertical wind shear and a surface dry line which provides very good dynamic conditions for a convective system to develop a tornado. Bottom cool air intrusion and strong wind shear made a single convective cell easier to develop more rapidly. The downward strong echo center height, the descending VIL, the rapid development of the radial velocity of the wind field in cyclonic vortex are good indicators of early warning of tornado. Tornado in the development process, as a low mass center convective system, obviously differs from the hail, a high center of gravity convection system. Sudden downward of mesocyclone height and maximum wind shear height, a sharp contraction of cyclone size indicate that the tornado will occur soon. |
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| Keywords: | Tornado Mesocyclone Ground line Microscale vortex signature |
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