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July 4 Fireworks: Spectacular on Weather Radar, Too | |
admin | |
2020-07-03 | |
发布年 | 2020 |
语种 | 英语 |
国家 | 美国 |
领域 | 气候变化 |
正文(英文) | Many of us will not be seeing fireworks this Independence Day, due to coronavirus restrictions and local ordinances. But one way to make up for not seeing festive explosions of color and fire in person this year might be to see what they look like…on weather radar. ![]()
In “Fireworks on Weather Radar and Camera,” published recently in the Bulletin of the AMS (BAMS), Dusan Zrnic (National Severe Storms Laboratory) and his colleagues looked at Fourth of July fireworks in Norman, Oklahoma, and Fort Worth, Texas, using reflectivity data and the dual-pol capability on finer resolution radar, which could discern meteor sizes from the explosions. The three types of radars were: NSSL’s research (3-cm wavelength) dual-polarization radar, the Terminal Doppler Weather Radar (TDWR) that operates in single polarization at a 5-cm wavelength from the Oklahoma City airport, and NWS Doppler radar in both Norman and Fort Worth. To complement the radar, video was taken of the shows. In Norman, they found bursts were typically 100 to 200 m above ground and a few of them spread to 200 m in diameter. Some of the meteors fell at 22 m s-1, or about the fall speed of large hail. The Fort Worth fireworks were often much larger, and reflectivity could cover an area about 800 m to more than 2,000 m across–four times as big as in Norman. The peak reflectivity signals in Fort Worth were also greater. ![]()
In polarimetric radar views of the Norman fireworks, the pyrotechnics signals blended with those from living things like insects, birds or bats. In the Fort Worth case, the backscatter differential phase and the differential reflectivity were in the range of giant hail. We asked Dr. Zrnic to help us understand his motivations for this work. How did you get started in observational studies with weather radar?
What would you like readers to learn from this article?
Was this a surprise?
Why study fireworks on radar?
What else surprised you?
What was the biggest challenge you encountered?
Fireworks on radar may be quieter, but the paper shows that—on polarimentric displays—they’re just as colorful. When your local fireworks shows finally return, the authors advise, “using smart phones, the public can observe radar images and the real thing at the same time.” |
URL | 查看原文 |
来源平台 | American Meteorological Society |
文献类型 | 新闻 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/281656 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | admin. July 4 Fireworks: Spectacular on Weather Radar, Too. 2020. |
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