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<p>The nowcasting of precipitation is an important issue in meteorological theory and operation for disaster prevention and reduction. Traditional nowcasting methods mainly use the data of radar reflectivity to implement the echo extrapolation. With the deployment of Doppler weather radar and dual-polarization weather radar, it is meaningful to incorporate the radial velocity data and dual-polarization data into nowcasting. For this goal, in this article we use the wind fields retrieved by the wind retrieval algorithm of velocity volume processing as the motion vectors to extrapolate the echoes of the dual-polarization Doppler weather radar, including the parameters of the reflectivity, differential reflectivity, correlation coefficient, and specific differential phase. Afterwards, contingency table and quantitative precipitation estimation are adopted to evaluate the nowcasting results. The comparison analysis between the extrapolated echoes and actual echoes on the two precipitation events in 2024 shows that the proposed scheme is feasible and can be used in nowcasting as well as the quantitative precipitation forecasting, and that the echo extrapolation of the differential reflectivity, correlation coefficient, and specific differential phase should be performed in combination with the echo extrapolation of the reflectivity to determine the distribution of precipitation.</p>

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The echo extrapolation of dual-polarization doppler radar based on the wind retrieval of radial velocity

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Nan Li,
  • Yongjiang Yu,
  • Guo Wei,
  • Yue Ruan

摘要

The nowcasting of precipitation is an important issue in meteorological theory and operation for disaster prevention and reduction. Traditional nowcasting methods mainly use the data of radar reflectivity to implement the echo extrapolation. With the deployment of Doppler weather radar and dual-polarization weather radar, it is meaningful to incorporate the radial velocity data and dual-polarization data into nowcasting. For this goal, in this article we use the wind fields retrieved by the wind retrieval algorithm of velocity volume processing as the motion vectors to extrapolate the echoes of the dual-polarization Doppler weather radar, including the parameters of the reflectivity, differential reflectivity, correlation coefficient, and specific differential phase. Afterwards, contingency table and quantitative precipitation estimation are adopted to evaluate the nowcasting results. The comparison analysis between the extrapolated echoes and actual echoes on the two precipitation events in 2024 shows that the proposed scheme is feasible and can be used in nowcasting as well as the quantitative precipitation forecasting, and that the echo extrapolation of the differential reflectivity, correlation coefficient, and specific differential phase should be performed in combination with the echo extrapolation of the reflectivity to determine the distribution of precipitation.