Observation Strategy of Tornado Radar Network in Northern Jiangsu
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Abstract:
In order to detect and analyze the threedimensional fine structure and evolution law of severe convective weather such as tornado with a small scale, short life cycle and heavy disaster, Jiangsu is building a highresolution dual polarization weather radar network in the North Jiangsu Plain, where tornadoes occur freguently. This paper focuses on the networking strategy of the tornado radar network in the northern Jiangsu to support the construction of the tornado radar network. The study shows: (1) The tornado radar network in the northern Jiangsu adopts the Xband weather radar (dual polarization) network with large antenna, all solid state and high performance, and high performance indexes, which can not only realize longdistance detection, but also obtain data products with a great deal of high spatial consistency and high spatialtemporal resolution data, to a large extent meeting the requirements of fast and fine detection 〖JP2〗for tornadoes and other severe convection weather. In addition, in order to overcome the problem of velocity ambiguity for Xband weather radar, a higher pulse repetition frequency can be used to 〖JP2〗expand the speed measurement range. (2) In the North Jiangsu tornado radar network, a triangle (〖WTBX〗N〖WTBZ〗 = 3,〖JP〗〖WTBX〗 L〖WTBZ〗 = 60 km) network topology is used for theoretical calculation. When the cumulative spatial density value is 90%, the performance indicators are: beam size 〖WTBX〗b〖WTBZ〗s is 282.0 m, the minimum beam height 〖WTBX〗b〖WTBZ〗h is 52.6 m, and the detection sensitivity 〖WTBX〗Z〖WTBZ〗min is 2.7 dB. Compared with the single Sband operational radar, the beam size of Xband network radar in the northern Jiangsu has reduced by about 2 times, the minimum beam height by about 1.5 times, and the detection sensitivity by about 2.4 dB. That is to say, the azimuth resolution, detection blind area, weak echo detection ability, and data spatial consistency have been greatly improved, which can provide more radar data with a high spatial resolution, less than 1 km or even 100 m, high weak echo detection capability, and high spatial consistency. All that is convenient for monitoring, forecasting, and early warning of severe convective weather such as tornadoes. (3) Five Xband allsolidstate dual polarization Doppler weather radar sets are respectively equipped in Yandu, Funing, Dafeng, Baoying, and Xinghua (tornadoprone areas), which forms the tornado radar network in the northern Jiangsu. Considering the various factors of radar location selection in the North Jiangsu Plain, the basic unit of the final network adopts the topology structure of approximate triangle (〖WTBX〗N〖WTBZ〗=3, 〖WTBX〗L〖WTBZ〗=45-65 km). The high spatialtemporal resolution tornado detection radar network is composed of three basic networking units, which is similar to a trapezoid structure, embedded in the Sband radar service network (equipped in Yancheng, Huai’an, Taizhou, respectively). In the future, the number of radar sets can further increase and the observation area can be widened. Xband weather radar or Cband phased array weather radar can be added in the tornado prone areas such as Gaoyou.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.