2010-2019年杭州地闪变化特征及其与海拔高度的关系

doi:10.3969/j.issn.1673-503X.2021.06.011

Abstract

Abstract:

Based on lightning location data from 2010 to 2019 in Hangzhou, the characteristics of ground flash and its relationship with altitude were analyzed using mathematical statistics and linear regression methods.The results show that the number of ground flashes in the east is greater than that in the west of Hangzhou and the number of ground flashes in the south is greater than that in the north.The region with a high density of ground flash is southwest of Hangzhou and the frequency of ground flash in the low altitude area is higher than that in the high altitude areas.The season with the highest frequency of ground flash is summer and ground flash mainly occurs in July and August.The frequencies of ground flashes in spring and autumn are similar, while the frequency in winter is one order of magnitude less than that in the other three seasons.In summer and autumn, the ground flash usually occurs from mid-afternoon to late-afternoon, while in spring, it occurs frequently in the early morning, which may be related to the long duration of nocturnal medium size convective system.The absolute value of ground flash intensity mainly concentrates from 10 to 60 kA.The average value of the positive ground flash increases with the altitude, and the average value of the negative ground flash and the total lightning current show a "V" shape along with the elevation.The proportions of positive, negative and the total ground flash current ≤ 16 kA and ≥ 100 kA decrease with the increase of altitude.The shielding failure rate is higher for hills' elevation from 100 to 200 meters and small mountains' elevation from 200 to 500 meters.The shielding failure risk caused by lightning current ≤ 16 kA and mountains' elevation higher than 1500 meters is low.The probability of shielding failure caused by lightning current ≥ 100 kA and mountains' elevation less than 400 meters is high.There are virtually no counterattacks at mountains' elevation above 1600 meters.

Key words: Ground flash, Altitude, Lightning current amplitude

CLC Number:

P427.3

Xue-wen BIAN,Wen-jia ZHENG,Qiang LI,Wei SUN. Characteristics of ground flash and its relationship with altitude in Hangzhou from 2010 to 2019[J]. Journal of Meteorology and Environment, 2021, 37(6): 86-92.

Figures/Tables 8

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季节累月平均地闪频次所占比例	冬季 (12月至翌年2月)	春季 (3—5月)	夏季 (6—8月)	秋季 (9—11月)
季节第1个月累月平均地闪频次占相应季节的比例	0.01	5.22	14.09	13.81
季节第2个月累月平均地闪频次占相应季节的比例	0.01	2.77	27.25	0.08
季节第3个月累月平均地闪频次占相应季节的比例	1.10	4.64	30.86	0.15
季度累月占累年的比例	1.12	12.64	72.21	14.04

地闪	四季	春季	夏季	秋季	冬季
正地闪	13054	5970	5660	1086	331
负地闪	306820	34453	225308	43813	3223
总地闪	319874	40423	230968	44899	3554
负地闪/总地闪/(%)	95.92	85.23	97.55	97.58	90.69

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Characteristics of ground flash and its relationship with altitude in Hangzhou from 2010 to 2019

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