基于卫星资料的大连地区强对流天气闪电活动特征

doi:10.3969/j.issn.1673-503X.2021.04.018

Abstract

Abstract:

Using the cloud top temperature (CTT) data retrieved from FY-4 satellite and radar echo data, we analyzed the characteristics of lightning activity in Dalian from June to September of 2019, focusing on the analysis of the correlation between the characteristics of lightning activity and radar echo and CTT in severe convective weather in this region on September 4, 2019. The results showed that the thunderstorm in this process started from the southeast of Dalian. In the initial stage of thunderstorms, cloud flashes are dominant, and the height of cloud flashes is mainly concentrated in 7-12 km. Lightning activity is mainly concentrated in the area where the radar echo intensity is greater than 30 dBz, and the corresponding cloud top height exceeds 8 km. There is a good correlation between lightning activity and CTT retrieved from the FY-4 satellite. Lightning mainly occurs in the area where the CTT is around 240-250 K. A quantitative analysis of the radar and lightning activity in Dalian from May to August of 2019 found that the lightning activity is mainly concentrated in the area near the radar combined reflectivity of 39.38 dBz, and the corresponding cloud top height is 8.21 km.

Key words: 3D lightning location, Radar echo, Cloud top temperature(CTT)

CLC Number:

P427.32

Yao-ren ZOU,Yun WANG,Shu-yi WANG,Dan XU. Characteristics of lightning activity during severe convective weather in Dalian area based on satellite data[J]. Journal of Meteorology and Environment, 2021, 37(4): 128-133.

Figures/Tables 8

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References 15

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雷达组合反射率/dBz	闪电频次/次	所占比例/(%)
0—10	12	1.32
10—20	20	2.20
20—30	77	8.46
30—40	293	32.20
40—50	500	54.95
50以上	8	0.88

日期	北京时间	雷达组合反射率/dBz	雷达回波顶高/km	闪电频次/(次/6 min)	闪电频次/(次/过程)
2019-05-16	00:06—03:24	39.50	9.50	4.0	339
2019-06-13	03:42—07:20	37.25	8.00	5.5	404
2019-07-13	10:54—18:16	34.25	7.00	2.0	271
2019-08-08	00:14—02:00	46.00	9.00	4.5	599
2019-08-26	15:14—15:38	37.25	7.25	1.0	3
2019-08-27	02:44—06:46	42.00	8.50	5.0	617

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Characteristics of lightning activity during severe convective weather in Dalian area based on satellite data

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