| 高原复杂地理参数对雷电活动的影响分析 |
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| 引用本文： | 胡亚男,陶世银,龚梅竹,马海玲.高原复杂地理参数对雷电活动的影响分析[J].干旱区地理,2022,45(3):746-753. |
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| 作者姓名： | 胡亚男 陶世银 龚梅竹 马海玲 |
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| 作者单位： | 1.青海省气候中心,青海 西宁 8100002.青海省气象服务中心,青海 西宁 810000 |
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| 基金项目： | 青海省应用基础研究资助 |
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| 摘 要： | 雷电活动参数作为反映区域雷电活动特征的重要指标,地形对其影响不容忽视。利用2014—2018年青海省地闪数据、数字地形高程数据以及HWSD土壤数据集,定量分析海拔、坡度、坡向以及土壤电阻率对青海省地闪分布特征的影响。结果表明：（1） 青海省地闪主要集中在海拔3150~4850 m、坡度0~35°的地区,其中东北坡向地闪次数最多,东南坡向地闪次数最少,地闪对应的土壤电阻率主要集中于100 Ω·m。（2） 地闪密度随海拔的升高先增大后减小,随坡度的增大而减小;地闪平均强度随海拔的升高先减小后增大,随坡度的增大而增大。（3） 选取92°27′00″~97°44′24″E、31°40′48″~34°16′48″N地闪活跃区域,对其1 km×1 km网格内地闪数据与地理参量平均值进行相关性分析,所选区域内地闪密度与平均海拔呈正相关关系,与平均坡度呈负相关关系;而地闪强度与平均海拔呈负相关关系,与平均坡度呈正相关关系。
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| 关 键 词： | 雷电活动 海拔 坡度 坡向 土壤电阻率 青海高原 |
| 收稿时间： | 2021-06-22 |
Influence analysis of geographic parameters on lightning in plateau |
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| HU Yanan,TAO Shiyin,GONG Meizhu,MA Hailing.Influence analysis of geographic parameters on lightning in plateau[J].Arid Land Geography,2022,45(3):746-753. |
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| Authors: | HU Yanan TAO Shiyin GONG Meizhu MA Hailing |
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| Institution: | 1. Qinghai Climate Center, Xining 810000, Qinghai, China2. Qinghai Meteorological Service Center, Xining 810000, Qinghai, China |
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| Abstract: | The influence of terrain on lightning current parameters cannot be ignored as a basis for lightning theory study and engineering protection application. Thus, in this study, the impacts of altitude, slope, aspect, and soil conductivity on the characteristics of cloud-to-ground lightning distribution in Qinghai Province, China, were quantitatively analyzed using cloud-to-ground lightning data from 2014 to 2018, digital terrain altitude data, and the HWSD data set. As per the data, it was determined that (1) cloud-to-ground lightning mostly concentrated at the altitude of 3150-4850 m and a slope of 0-35°. The number of slope to the northeast had the greatest cloud-to-ground lightning, whereas the one to the southeast had the least. The electrical conductivity corresponding to cloud-to-ground lightning is primarily concentrated at a distance of 100 Ω·m. (2) For a given unit area, the cloud-to-ground lightning frequency increased first and then decreased with altitude. The number of cloud-to-ground lightning strikes increases slowly as the slope increases. In addition, the average cloud-to-ground lightning intensity decreases first and then increases as altitude increases. It showed a trend of gradual increase as the slope increased and an increasing trend as the conductivity increased. (3) A correlation analysis was performed between the cloud-to-ground lightning data and the mean value of the geographical parameters in a 1 km×1 km grid covering the active areas of 92°27′00′′-97°44′24′′E and 31°40′48′′-34°16′48′′N. The cloud-to-ground lightning density in the selected areas was positively correlated with altitude and negatively correlated with the slope. A negative correlation was noted between cloud-to-ground lightning intensity and mean altitude, but a positive correlation with slope. |
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| Keywords: | lightning activity altitude slope slope direction soil conductivity Qinghai Plateau |
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