| 青藏高原雷暴云降水与地面电场的观测和数值模拟 |
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| 引用本文： | 郭凤霞,张义军,言穆弘,赵阳.青藏高原雷暴云降水与地面电场的观测和数值模拟[J].高原气象,2007,26(2):257-263. |
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| 作者姓名： | 郭凤霞 张义军 言穆弘 赵阳 |
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| 作者单位： | 1. 中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000
2. 中国气象局,中国气象科学研究院,北京,100081 |
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| 基金项目： | 国家自然科学基金
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中国科学院"西部之光"人才培养计划 |
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| 摘 要： | 在2003年青藏高原那曲地区夏季雷暴云的观测试验中,三次伴有降水的过程中都出现了地面电场(Egnd)随降水的漂移现象,而且固态和液态降水对Egnd的极性改变并不相同。为了模拟再现高原雷暴云降水和Egnd之间的关系,选取了8月13日这次具有高原雷暴代表性特征的过程,模拟了雷暴云移经观测点上空期间,测站固、液态降水与Egnd的变化以及雷暴云下部正电荷区的空间分布。模拟的Egnd及固、液态降水与其的对应关系与观测事实较一致。分析结果表明,固态降水主要携带正电荷,液态降水主要携带负电荷,各类带不同极性和数量电荷的降水粒子常共存在雷暴云中,Egnd主要受携带电荷量占主导地位的降水粒子的影响,地面出现强正电场时正好是云在当顶并且地面出现强固态降水的时间。
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| 关 键 词： | 青藏高原地区 雷暴过程 地面电场 LPCC 降水粒子 |
| 文章编号： | 1000-0534（2007）02-0257-07 |
| 修稿时间： | 2006-02-062006-06-20 |
Numerical Study and Observation of the Relationship between Surface Electric Field and Precipitation in Thunderstorm over Qinghai-Xizang Plateau |
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| GUO Feng-xia,ZHANG YI-jun,YAN Mu-hong,ZHAO Yang.Numerical Study and Observation of the Relationship between Surface Electric Field and Precipitation in Thunderstorm over Qinghai-Xizang Plateau[J].Plateau Meteorology,2007,26(2):257-263. |
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| Authors: | GUO Feng-xia ZHANG YI-jun YAN Mu-hong ZHAO Yang |
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| Institution: | 1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2. China Meteorological Administration, Chinese Academy of Meteorological Sciences, Beijing 100081, China |
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| Abstract: | A field observation was conducted in Nagqu area over Qinghai-Xizang Plateau in the summer of 2003.Surface electrical field excursion associated with precipitation presented in three thunderclouds.Solid and Liqud precipitation play different roles in the polarity change of surface electric field.A classical Plateau storm that took place on 13 August 2003 is simulated in this paper by using a three-dimensional dynamic-electrification coupled model to represent the observation.The evolution of surface electric field and solid and liquid precipitation in observation station and their relationship with low positive charge center are analysed.The result indicates that the most of solid precipitation carry positive charge and liquid precipitation carry negative charge.Precipitations that carry different polarities and quantities charge always coexist in thundercloud,and surface electric field is influenced by primary precipitation.The precipitation cloud increase flash frequency.Strong surface electric field appears during cloud moving through the top of observation station and strong solid precipitation appearing at surface. |
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| Keywords: | Qinghai-Xizang Plateau regions Thundercloud Surface electric field LPCC Precipitation |
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