2011—2019年中国长江三角洲区域闪电时空分布特征

doi:10.3969/j.issn.1673-503X.2021.04.014

Abstract

Abstract:

Based on the data observed by the ADTD lightning location system from the 27 stations in Jiangsu, Zhejiang, and Anhui provices from 2011 to 2019, the lightning frequency and intensity in the Yangtze River Delta region of China i. e. the integrated and coordinated development area including three provinces and one city(Jiangsu, Zhejiang and Anhui provinces, Shanghai)were statistically analyzed, and the spatial distributions of lightning frequency were also investigated with the EOF method. The results showed that in the Yangtze River Delta region of China, the number of negative lightning accounts for more than 95% of the total number, and the average current intensity of positive lightning is greater than the absolute value of that of negative lightning. The maximum and absolute minimum values of the average current intensity of positive and negative lightning appear in Jiangsu and Zhejiang provinces, respectively. The daily and monthly variation curves of total lightning frequency and intensity both feature single peak and single valley. For daily variation, the minimum value of total lightning intensity appears at 03:00 p. m. and the peak value appears during 04:00-05:00 p. m. For monthly variation, the total lightning frequency and intensity reach peak and minimum in August, respectively. The high-frequency period of positive lightning is in April, July, and November every year. The spatial distribution of total lightning frequency is entirely consistent with the terrain, that is, there is a high lightning frequency in high altitude areas, while the spatial distribution of total lightning intensity is opposite. According to the principal component analysis on the total lightning frequency, the cumulative variance contribution of the first 4 feature vectors reaches 51.07%, indicating both regional consistency and obvious difference. The spatial distribution pattern of lightning frequency can be divided into regional consistency, north-south division, stagger division, eastern-western division types.

Key words: Lightning frequency, Lightning current intensity, Principal component analysis

CLC Number:

P427.32⁺1

Kai WANG,Li-ya ZHOU,Xiao-yu JU,Xiang-yang CHENG. Temporal and spatial distribution characteristics of lightning in the Yangtze River Delta of China from 2011 to 2019[J]. Journal of Meteorology and Environment, 2021, 37(4): 100-106.

Figures/Tables 8

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References 19

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参数	上海	江苏	浙江	安徽	合计/均值
总地闪/次	149223	1631170	2865523	2212539	6858455
区域面积/km²	6340	107200	105600	140100	359240
地闪密度/(次/km²)·a^-1	2.62	1.69	3.02	1.76	2.12
正闪百分比/(%)	2.50	4.80	5.27	5.25	4.45
负闪百分比/(%)	97.50	95.20	94.73	94.75	95.55
正闪强度/kA	57.65	61.72	51.55	61.35	58.07
负闪强度/kA	-44.27	-46.69	-36.23	-42.52	-42.43

序号	特征值	方差占比/(%)	方差累积占比/(%)	特征值级差	误差阈值	备注
1	10.037	21.82	21.82	4.245	0.399	通过检验
2	5.792	12.59	34.41	1.566	0.230	通过检验
3	4.226	9.19	43.60	0.790	0.168	通过检验
4	3.436	7.47	51.07	1.679	0.137	通过检验
5	1.757	3.82	54.89	0.114	0.070	通过检验
6	1.643	3.57	58.46	0.316	0.065	通过检验
7	1.327	2.88	61.34	0.097	0.053	通过检验
8	1.230	2.67	64.02	0.049	0.049	未通过检验
9	1.181	2.57	66.58	0.141	0.047	通过检验
10	1.04	2.26	68.85	0.035	0.041	未通过检验
11	1.005	2.18	71.03	1.005	0.040	通过检验

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Temporal and spatial distribution characteristics of lightning in the Yangtze River Delta of China from 2011 to 2019

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