CORRECTION OF RAINFALL ATTENUATION AND PARTIAL TERRAIN BLOCKAGE FOR C-BAND DUAL POLARIZATION WEATHER RADARChinese Full TextEnglish Full Text (MT)
XIA Feng;LIU Xiantong;ZHENG Tengfei;FENG Lu;WAN Qilin;OU Guanhua;ZHANG Xiaofei;Guangzhou Institute of Tropical and Marine Meteorology,China Meteorological Administration;Xinfeng Meteorological Bureau;Anhui Sun-Create Electronics Co., Ltd;
Abstract: Weather radar can provide high spatio-temporal resolution observational data for the studies related to mesoscale convective systems. Nevertheless, the attenuation caused by rainfall and complex terrain could seriously affect radar signals. In this paper, three severe rainfall processes in 2018 are comprehensively investigated using the C-band dual polarization weather radar data collected at Xinfeng of Guangdong Province. The three rainfall processes include the severe tropical storm Ewiniar on June 8, the monsoon rainfall in South China on August 30, and the super typhoon Mangkhut on September 16. Based on ΦDPdata, an adaptive algorithm for rainfall profile is developed to correct the ZHattenuation induced by rainfall and partial terrain blockage. And then the results after correction are directly compared with the ZH of S-band dual polarization weather radar data collected at Guangzhou. The comparison has been conducted further against the simulated radar data by using the four sets of 2 D video raindrop spectrum data acquired at the Longmen Field Experiment Base for Cloud Physics, China Meteorological Administration. Moreover, the corrected results are validated using the empirical statistical formulas of ZHKDP. This shows that the correction algorithm could improve radar reflectivity data to some extent. Finally,the case study shows that the ground-to-high-level vertical structure of the radar reflectivity of convective cells in the spiral rain belt could be clearly presented. This correction algorithm could effectively improve the near ground observation ability of weather radars in complex terrain.
Keywords：
dual polarization radar; radar reflectivity factor; rainfall attenuation; partial terrain blockage attenuation; attenuation correction;
- DOI：
10.16032/j.issn.1004-4965.2021.053
- Series：
(A) Mathematics/ Physics/ Mechanics/ Astronomy
- Subject：
Meteorology
- Classification Code：
P412.25
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