2007—2017年浙江省雷暴路径时空特征分析

doi:10.3969/j.issn.1673-503X.2021.01.008

摘要/Abstract

摘要：

基于浙江省ADTD二维闪电定位系统监测的近11 a（2007—2017）地闪数据，采用密度极大值快速搜索聚类算法和Kalman滤波算法实现对雷暴的识别及其路径的追踪，并探讨大范围雷暴过程的时空分布特征。结果表明：该方法能够有效对浙江省各类雷暴的识别追踪，共筛选出261条雷暴过程的路径，其存在明显的年变化和年际变化，年路径数与年地闪频次存在较好的对应关系，月分布上路径数呈双峰分布，峰值分别在初春和夏季，其中春季雷暴路径移动时长高于其他季节。88.51%的雷暴自西向东移动，且偏北方向多于偏南方向，各移动方向上雷暴路径数的月分布存在差异性，春季雷暴移动的方向相比夏季较为集中，夏季雷暴各月最为主导的移动方向各不相同；雷暴的移动速度主要集中在50 km/h左右，自西-东和西南-东北方向移动的雷暴速度快于其他方向；空间分布上，主要存在两个移动通道，一是沿金衢盆地、绍兴和宁波方向的区域，其次是天目山脉以北的湖州嘉兴平原一带；从地形特征来看，路径主要发生在丘陵地带，平原及山地相对偏少，且地势越高路径越少。

关键词: 雷暴路径, 地闪, 移动特征

Abstract:

Based on the nearly 11 a (2007-2017) cloud-to-ground lightning data monitored by the ADTD (Advanced TOA and Direction system) 2D lightning location system in Zhejiang province, the identification of thunderstorms and tracking their paths were realized using the density maximum fast search clustering and Kalman filtering algorithms.The spatial and temporal distribution characteristics of the process of large-scale thunderstorms were discussed.The results show that the above method can recognize and track all kinds of thunderstorms in Zhejiang province.261 tracks of thunderstorm processes are screened out, which show considerable annual and interannual variations.There is a good corresponding relationship between the number of the annual tracks and the frequency of annual lightning.The number of monthly tracks demonstrates a bimodal distribution, with peak values appearing in early spring and summer.The thunderstorms in spring generally move longer than those in other seasons.In the spatial distribution, the direction of 88.51% of thunderstorm tracks is from west to east, and more thunderstorms move toward the north.There is a difference in the monthly distribution of the number of thunderstorm tracks in each moving direction.The movement direction of thunderstorms in spring is more concentrated than those in summer.The dominant movement direction of summer thunderstorms is different.The moving speed of thunderstorms is about 50 km per hour.The thunderstorms moving from west to east and southwest to northeast are faster than in other directions.In terms of spatial distribution, there are two main mobile tracks.One is the area along the Jinqu basin, Shaoxing and Ningbo, the second is the area from Huzhou Jiaxing Plain to the north of Tianmu Mountain.From the perspective of topographic features, the tracks mainly occur in hilly areas, with relatively few plains and mountains, and the higher the terrain, the fewer paths.

Key words: Thunderstorm track, Cloud-to-ground lightning, Moving direction

中图分类号:

P446

崔雪东,张卫斌. 2007—2017年浙江省雷暴路径时空特征分析[J]. 气象与环境学报, 2021, 37(1): 59-66.

Xue-dong CUI,Wei-bin ZHANG. Spatiotemporal distribution characteristics of thunderstorm tracks in Zhejiang province from 2007 to 2017[J]. Journal of Meteorology and Environment, 2021, 37(1): 59-66.

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