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2013年北京一代粘虫迁飞峰期的多普勒天气雷达观测
Using doppler weather radar to monitor the first generation of migrating Mythimna separata (Walker) in Beijing in 2013
柳 凡,张 智,林培炯,李祥瑞,焦热光,胡 高,张云慧
点击:389次 下载:17次
DOI:10.7679/j.issn.2095-1353.2023.026
作者单位: 南京农业大学植物保护学院,南京 210095
中文关键词:粘虫;迁飞;多普勒天气雷达;回波;反射率因子;监测预警
英文关键词:Mythimna separata; migration; doppler weather radar; echoes; reflectivity; monitoring and forecasting
中文摘要:

【目的】 获取粘虫Mythimna separata(Walker)迁飞高峰期内的多普勒天气雷达回波特征,探索天气雷达解算虫量与高空测报灯诱虫数据之间的关系,奠定天气雷达监测昆虫迁飞的基础。【方法】 选取粘虫迁飞高峰日北京CINRAD-SA天气雷达数据和延庆高空测报灯2013年一代粘虫分时段诱集数据,采用Python和R语言对天气雷达数据进行提取、反演、计算、统计、分析及可视化。【结果】 6月5日至9日延庆监测点每晚灯诱粘虫数量占比均在80%以上,监测点上空反射率因子15 dBZ到15 dBZ的回波占比90%以上,其中0到15 dBZ的雷达回波数量占比分别为30.7%、42.0%、43.2%、37.2%和25.1%,占比与灯诱粘虫数量占比的变化趋势相同。6月5日至8日,空中回波方向向北,9日回波方向以向南为主,5日至9日,北向回波占比与灯下粘虫占比变化趋势相同,两者间的相关系数为0.95。6月5日至8日北向回波的平均速度接近风速,9日北向回波速度为1.36 m/s。天气雷达解算粘虫数量与灯下粘虫数量呈线性正相关,粘虫迁飞盛期一个夜晚飞过北京上空雷达监测范围内(4 300 km2)可监测的粘虫虫量达600万头,总生物量超过0.8吨。【结论】 多普勒天气雷达可以观测粘虫迁飞高峰的空中特征,这些参数有助于提高对粘虫迁飞规律的认知。

英文摘要:

[Objectives]  To obtain the characteristics of the migrating Mythimna separata (Walker) during the peak migration episode in 2013 from the doppler weather radar echoes, and explore the relationship between the numbers resolved from radar echoes and the catch sizes from search light traps, which would provide a foundation to monitor insect migration with doppler weather radar. [Methods]  The CINRADSA weather radar data in Beijing and the interval catch sizes from searchlight trap during the migrating peak days of the first generation moths of M. separata in 2013 were selected, and the weather radar data were extracted, retrieved, calculated, counted, analyzed and visualized with some libraries in Python and R. [Results]  The number of the M. separata moths from searchlight trap at Yanqing accounted for more than 80% every night from 5th to 9th in June, and the reflectivity between 15 dBZ and 15 dBZ of the echoesfrom the insect swarms above the monitoring site was more than 90%, of which the number of radar echoes from 0 to 15 dBZ accounted for 30.7%, 42.0%, 43.2%, 37.2% and 25.1%, respectively, the trend was similar with the proportion of the M. separata moths from searchlight trap. The direction of the target echoes was northward on average from 5th to 8th in June and southward on 9th. The proportion of echoes with northward direction has the similar trend with the proportion of the M. separata moths from searchlight trap, and the correlation coefficient between them is 0.95. The average speed of the northward echoes from 5th to 8th is close to the wind speed, however the displacement speed is 1.36 m/s on the 9th, which is close to its own flight speed. The number of the M. separata moths retrieved from weather radar data was positively linearly correlated with the number of the M. separata moths from searchlight trap. The maximum of M. separata moths flying over Beijing within the radar monitoring range (approximately 4 300km2) in one night reached to 6 million heads, and the total mass was more than 0.8 tons. [Conclusion]Doppler weather radar can observe the characteristics of the migrating M. separata moths during the peak episode, and these parameters help in understand the migration of M. separata.

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