2007—2018年金衢盆地地闪气候特征大数据分析
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P427.3

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金华市科技局项目(2018-4-108);金华市气象局项目(2018-06)


Big data analysis of cloud-to-ground lightning in Jinqu Basin during 2007-2018
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    摘要:

    本文选取2007—2018年金华地区地闪资料,研究分析金衢盆地地闪大数据的气候特征,及地闪资料与地形、海拔高度的对应关系.结果显示:1)2007—2018年金华地区地闪年均次数为45 481次,年均地闪密度为4.3次·km-2·a-1,地闪密度变化范围为2.64~5.92次·km-2·a-1;2)2007—2018年金华地区逐年地闪空间分布差异大,各年的空间分布不均匀,地闪主要分布在西南角的仙霞岭及其至会稽山沿线,以及兰溪市、婺城区及金东区交界的金华山,而东南角海拔较高的大盘山和北面的龙门山的总地闪密度高值面积较小;3)将总地闪密度分段与地形、海拔高度对比显示,80次·km-2以上总地闪密度与高海拔山区有较好的一致性,强地闪(电流强度100 kA以上)密度为5~7次·km-2的25个点中有23个点分布在海拔208~989 m山区;4)下垫面电阻率较低的三江流域地区地闪密度为金衢盆地内最大的"洼地",杭长铁路及附近的地闪密度仅接近平均值,这与其他相关研究结论不一致;5)2007—2018年中有41.7%年份的地闪次数和总地闪次数随海拔高度增加,其他年份的地闪强度均值和总地闪强度均值随海拔高度增长,且均通过了显著性检验.

    Abstract:

    Based on the cloud-to-ground (CG) lightning data in Jinhua area from 2007 to 2018,we analyzed the climatic characteristics of CG lightning in Jinqu Basin and the corresponding relationship between CG lightning and topography or altitude.The results showed that:(1) The annual average times of lightning in Jinhua area from 2007 to 2018 is 45 481,and the average annual CG lightning density is 4.3 fl·km-2·a-1,which varies from 2.64 to 5.92 fl·km-2·a-1;(2)The difference in spatial distribution of annual CG lightning in Jinhua is rather big,and the CG lightning mainly occurred in the southwestern corner of Jinhua,specifically in Xianxia ridge area and along the Kuaiji mountain,as well as the Jinhua mountain at the junction of Lanxi city,Wucheng district and Jindong district.While in the southeast corner of Dapan mountain and in the north area of Longmen mountain,the total CG lightning density is relatively small;(3) Total CG lightning density has certain relation with topography and altitude.When the total flash density is above 80 times·km-2,it probably distributed in high-altitude mountainous areas;and 23 points out of the 25 points with strong lightning density (5-7 fl·km-2) distributed in the mountainous areas between 208 m and 989 m above sea level;(4) The CG lightning density in the Sanjiang River basin is the lowest,and it is barely close to the average along the Hangzhou-Changsha Railway and in its vicinity,which is inconsistent with other relevant research conclusions;(5) During the 12 years of 2007-2018,the number and total number of CG lightning increased with altitude in 41.7% years,and in the rest of 58.3% years,the average and total average CG lightning intensity increased with altitude,both of which have passed the significant test.

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许洪泽,周梅,胡慧萍,王芳.2007—2018年金衢盆地地闪气候特征大数据分析[J].南京信息工程大学学报(自然科学版),2020,12(3):373-383
XU Hongze, ZHOU Mei, HU Huiping, WANG Fang. Big data analysis of cloud-to-ground lightning in Jinqu Basin during 2007-2018[J]. Journal of Nanjing University of Information Science & Technology, 2020,12(3):373-383

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  • 收稿日期:2019-05-14
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  • 在线发布日期: 2020-07-07
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