基于VLF/LF三维闪电定位系统的大兴安岭闪电时空分布特征

doi:10.11707/j.1001-7488.20221103

Abstract

Abstract:

Objective: Lightning fire is the biggest cause threatening the safety of forest resources in Daxing'anling Mountains. This study aims to provide a scientific basis for lightning fire monitoring, early warning, prevention and suppression by analyzing the occurrence pattern of lightning in the Daxing'anling Mountains. Method: Based on the monitoring data with the VLF/LF 3D lightning location system from 2019 to 2021 in Daxing'anling Mountains, the quantity of lightning (intra-cloud lightning, IC; cloud to ground lightning, CG; positive lightning, PL; negative lightning, NL), current intensity, height of IC, and the temporal and spatial distribution of lightning activities were analyzed. Result: 1) A total of 710 487 times of lightning were detected in Daxing'anling Mountains (321 667 times in Heilongjiang Daxing'anling Mountains and 388 820 times in Inner Mongolia Daxing'anling Mountains) from 2019 to 2021, with an average of 236 829 times per year. The lightning in Daxing'anling Mountains was mainly negative CG, in which the IC: CG ratio and PL: NL ratio were roughly 1:5. The current intensity of PL and NL in Daxing'anling Mountains ranged from 4.5 to 371 kA, and from -501.7 to -4.5 kA, respectively, and the absolute value of the current intensity of most lightnings was concentrated between 4.5 and 50 kA. The average IC height in Daxing'anling Mountains was 4.72 km, of which 88.09% was mainly below 10 km. 2) The average number of lightning days in Daxing'anling Mountains was 127 days per year. Lightning started at the end of April and ended in mid and late October, mostly from May to August, of which July was a concentrated high incidence period. The occurrence of lightning showed a single peak change pattern in a single day. Lightning started to increase at 10:00, and the high incidence period was from 12:00 to 17:00. After 18:00, the number of lightning gradually decreased, and the total amount of lightning decreased significantly from midnight to early morning. 3) The distribution of lightning in Daxing'anling Mountains was spatial aggregation. On the whole, the lightning density in Daxing'anling Mountains of Heilongjiang was significantly higher than that in Daxing'anling Mountains of Inner Mongolia. High density lightning areas were mostly distributed in Daxing'anling Mountains of Heilongjiang, such as Huzhong, Tahe, Hanjiayuan, Xinlin, Nanwenghe Nature Reserve and Jiagedaqi. 4) Low intensity negative CGs, which are easy to cause lightning fires, were mainly concentrated in Xilinji, the south of Tuqiang, most area of Tahe, the north of Huzhong, and Nanwenghe Nature Reserve in Heilongjiang Daxing'anling Mountains, and the north of Mangui, a small part of Hanma and Jinhe in Inner Mongolia Daxing'anling Mountains. Conclusion: The occurrence of lightning in Daxing'anling Mountains has obvious spatial-temporal heterogeneity. Based on the occurrence pattern of lightning and specific types of lightning that are prone to fire, it is suggested that targeted monitoring, early warning and early deployment are effective means to prevent major lightning fires.

Key words: Daxing'anling Mountains, 3D lightning location system, intra-cloud lightning and cloud to ground lightning, positive lightning and negative lightning, spatiotemporal distribution, lightning fire

CLC Number:

S762

Weike Li,Lifu Shu,Shangbo Yuan,Jiajun Song,Wei Li,Liqing Si,Fengjun Zhao,Yahui Wang,Mingyu Wang. Temporal and Spatial Distribution Characteristics of Lightning in Daxing'anling Mountains Based on VLF/LF 3D Lightning Location System[J]. Scientia Silvae Sinicae, 2022, 58(11): 21-30.

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年份 Year	黑龙江大兴安岭 Heilongjiang Daxing'anling Mountains		内蒙古大兴安岭 Inner Mongolia Daxing'anling Mountains
年份 Year	林业局/保护区 Forestry bureau/Reserve	闪电密度 Lightning density (times·km^-2)	林业局/保护区 Forestry bureau/Reserve	闪电密度 Lightning density (times·km^-2)
	南瓮河自然保护区 Nanwenghe Nature Reserve	3.53	加格达奇 Jiagedaqi	2.36
	塔河 Tahe	2.42	满归 Mangui	1.95
2019	呼玛 Huma	2.41	诺敏经营所 Nuomin Jingyingsuo	1.92
	图强 Tuqiang	2.22	大杨树 Dayangshu	1.79
	呼中自然保护区 Huzhong Nature Reserve	2.16	汗马 Hanma	1.77
	平均值 Average	2.01	平均值 Average	1.38
	南瓮河自然保护区 Nanwenghe Nature Reserve	2.51	永安山 Yonganshan	2.10
	新林 Xinlin	2.18	阿龙山 Alongshan	1.90
2020	韩家园 Hanjiayuan	2.16	金河 Jinhe	1.80
	呼中 Huzhong	2.06	满归 Mangui	1.51
	呼玛 Huma	1.97	莫尔道嘎 Moerdaoga	1.45
	平均值 Average	1.73	平均值 Average	1.06
	塔河 Tahe	1.38	汗马 Hanma	0.92
	南瓮河自然保护区 Nanwenghe Nature Reserve	1.19	乌玛 Wuma	0.91
2021	双河自然保护区 Shuanghe Nature Reserve	1.18	永安山 Yonganshan	0.88
	阿木尔 Amuer	1.07	满归 Mangui	0.86
	图强 Tuqiang	1.06	阿里河 Alihe	0.82
	平均值 Average	0.88	平均值 Average	0.58
	南瓮河自然保护区 Nanwenghe Nature Reserve	7.24	永安山 Yonganshan	4.58
	塔河 Tahe	5.61	满归 Mangui	4.32
2019―2021	韩家园 Hanjiayuan	5.19	加格达奇 Jiagedaqi	4.31
	呼玛 Huma	5.06	汗马 Hanma	3.96
	新林 Xinlin	5.02	阿龙山 Alongshan	3.82
	平均值 Average	4.62	平均值 Average	3.02

年份 Year	黑龙江大兴安岭 Heilongjiang Daxing'anling Mountains		内蒙古大兴安岭 Inner Mongolia Daxing'anling Mountains
年份 Year	林业局/保护区 Forestry bureau/Reserve	闪电密度 Lightning density (times·km^-2)	林业局/保护区 Forestry bureau/Reserve	闪电密度 Lightning density (times·km^-2)
	南瓮河自然保护区 Nanwenghe Nature Reserve	1.20	满归 Mangui	0.89
	塔河 Tahe	0.96	汗马 Hanma	0.83
2019	图强 Tuqiang	0.94	永安山 Yonganshan	0.65
	呼中自然保护区 Huzhong Nature Reserve	0.90	加格达奇 Jiagedaqi	0.57
	西林吉 Xilinji	0.82	金河 Jinhe	0.57
	平均值 Average	0.73	平均值 Average	0.37
	呼中 Huzhong	0.83	金河 Jinhe	0.75
	南瓮河自然保护区 Nanwenghe Nature Reserve	0.80	永安山 Yonganshan	0.72
2020	新林 Xinlin	0.76	阿龙山 Alongshan	0.69
	塔河 Tahe	0.73	满归 Mangui	0.61
	呼中自然保护区 Huzhong Nature Reserve	0.61	莫尔道嘎 Moerdapga	0.52
	平均值 Average	0.54	平均值 Average	0.28
	塔河 Tahe	0.51	满归 Mangui	0.28
	南瓮河自然保护区 Nanwenghe Nature Reserve	0.41	乌玛 Wuma	0.26
2021	阿木尔 Amuer	0.38	汗马 Hanma	0.24
	呼中 Huzhong	0.35	永安山 Yonganshan	0.23
	图强 Tuqiang	0.34	奇乾 Qiqian	0.17
	平均值 Average	0.27	平均值 Average	0.08
	南瓮河自然保护区 Nanwenghe Nature Reserve	2.41	满归 Mangui	1.77
	塔河 Tahe	2.20	永安山 Yonganshan	1.60
2019―2021	呼中 Huzhong	1.99	汗马 Hanma	1.47
	新林 Xinlin	1.79	金河 Jinhe	1.37
	图强 Tuqiang	1.76	阿龙山 Alongshan	1.36
	平均值 Average	1.54	平均值 Average	0.73

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Temporal and Spatial Distribution Characteristics of Lightning in Daxing'anling Mountains Based on VLF/LF 3D Lightning Location System

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