Archive > Volume 49 Issue 2 > 2021,49(2):157-165 Prev Next

Observation Strategy of Tornado Radar Network in Northern Jiangsu

  • Article
  • Figures
  • Metrics
  • Preview PDF
  • Reference
  • Related
  • Cited by
  • Materials
    Abstract:
    In order to detect and analyze the threedimensional 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 highresolution 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 Xband weather radar (dual polarization) network with large antenna, all solid state and high performance, and high performance indexes, which can not only realize longdistance detection, but also obtain data products with a great deal of high spatial consistency and high spatialtemporal 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 Xband 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 Sband operational radar, the beam size of Xband 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 Xband allsolidstate dual polarization Doppler weather radar sets are respectively equipped in Yandu, Funing, Dafeng, Baoying, and Xinghua (tornadoprone 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 spatialtemporal resolution tornado detection radar network is composed of three basic networking units, which is similar to a trapezoid structure, embedded in the Sband 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. Xband weather radar or Cband phased array weather radar can be added in the tornado prone areas such as Gaoyou.

    Keywords:


    Project Supported:
    Clc Number:
External LinksChina Meteorological AdministrationCMA Meteorological Observation CentreChinese Academy of Meteorological SciencesBeijing Meteorological ServiceNational Satellite Meteorological Center
You are thevisitors
Supported by:Beijing E-Tiller Technology Development Co., Ltd.