不同闪电参数化方案对海南岛一次强对流闪电过程的数值模拟研究

doi:10.3969/j.issn.1673-503X.2023.03.003

Abstract

Abstract:

The WRF V3.9.1 mesoscale model coupled with the non-inductive electrification scheme and the lightning parameterization scheme was used to simulate a strong convection process occurred in Hainan Island on June 26, 2018.The simulation ability of lightning activity in tropical islands was discussed using three lightning parameterization schemes (LPI scheme, PR92w scheme, PR92z scheme) in the model.The results show that the model can well reproduce the radar echo characteristics of the strong convective process, the vertical velocity and hydrometeor particles are important factors affecting the model prediction of lightning, and the strong vertical velocity and abundant ice particles in the cloud are conducive to the development of the electric process in the cloud.LPI and PR92w schemes reproduce the distribution pattern of lightning and the structure of positive and negative lightning with an electric charge area between 8~15 km, while the lightning simulated by the PR92z scheme shows a scattering pattern, with a large deviation.The Equitable Threat Score (ETS) of the LPI scheme is the best with a value of 0.65.Further analysis of the correlation between LPI and lightning frequency shows that there is a significant positive correlation between them.The correlation coefficient between the regional average LPI and lightning frequency is 0.9, and the goodness of fitting value is 0.83.

Key words: LPI (Lightning Potential Index), Lightning parameterization, WRF model, Severe convection weather, Lightning forecast

CLC Number:

P435

Wei YANG,Xun LI,Jian-xing LIN,You-long CHEN,Bin-yu YANG. Numerical simulation of a strong convective lightning process in Hainan island with different lightning parameterization schemes[J]. Journal of Meteorology and Environment, 2023, 39(3): 20-30.

Figures/Tables 11

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区域	D1	D2	D3
水平格点	170×178	286×286	165×165
分辨率	18 km	6 km	2 km
积云方案	Kain-Fritsch	Kain-Fritsch	不使用
微物理方案	Morrison	Morrison	Morrison
边界层方案	YSU	YSU	YSU
辐射方案	RRTM长波/Dudhia短波	RRTM长波/Dudhia短波	RRTM长波/Dudhia短波
陆面方案	RUC	RUC	RUC
非感应起电方案	SP98	SP98	SP98
闪电方案	LPI/PR92w/PR92z	LPI/PR92w/PR92z	LPI/PR92w/PR92z

闪电参数化方案	LPI	PR92w	PR92z
BIAS评分	1.17	1.22	1.45
ETS评分	0.65	0.5	0.04

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Numerical simulation of a strong convective lightning process in Hainan island with different lightning parameterization schemes

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