Reliability of X-band Dual-polarization Phased Array Radars Through Comparison with an S-band Dual-polarization Doppler Radar |
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| Authors: | ZHOU Xin-yu HU Dong-ming ZHANG Yu LI Hao-wen TIAN Cong-cong |
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| Affiliation: | Guangzhou Meteorological Observatory, China Meteorological Administration, Guangzhou 511430 China,Guangdong Meteorological Observatory, China Meteorological Administration, Guangzhou 510080 China,Guangzhou Meteorological Observatory, China Meteorological Administration, Guangzhou 511430 China,Guangzhou Meteorological Observatory, China Meteorological Administration, Guangzhou 511430 China and Guangzhou Meteorological Observatory, China Meteorological Administration, Guangzhou 511430 China |
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| Abstract: | Based on the observations of a squall line on 11 May 2020 and stratiform precipitation on 6 June 2020 from two X-band dual-polarization phased array weather radars (DP-PAWRs) and an S-band dual-polarization Doppler weather radar (CINRAD/SA-D), the data reliability of DP-PAWR and its ability to detect the fine structures of mesoscale weather systems were assessed. After location matching, the observations of DP-PAWR and CINRAD/SA-D were compared in terms of reflectivity (ZH), radial velocity (V), differential reflectivity (ZDR), and specific differential phase (KDP). The results showed that: (1) DP-PAWR has better ability to detect mesoscale weather systems than CINRAD/SA-D; the multi-elevation-angles scanning of the RHI mode enables DP-PAWR to obtain a wider detection range in the vertical direction. (2) DP-PAWR's ZH and V structures are acceptable, while its sensitivity is worse than that of CINRAD/SA-D. The ZH suffers from attenuation and the ZH area distribution is distorted around strong rainfall regions. (3) DP-PAWR's ZDR is close to a normal distribution but slightly smaller than that of CINRAD/SA-D. The KDP products of DP-PAWR have much higher sensitivity, showing a better indication of precipitation. (4) DP-PAWR is capable of revealing a detailed and complete structure of the evolution of the whole storm and the characteristics of particle phase variations during the process of triggering and enhancement of a small cell in the front of a squall line, as well as the merging of the cell with the squall line, which cannot be observed by CINRAD/SA-D. With its fast volume scan feature and dual-polarization detection capability, DP-PAWR shows great potential in further understanding the development and evolution mechanisms of meso-γ-scale and microscale weather systems. |
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| Keywords: | comparative observations mesoscale weather systems fine structure X-band dual-polarization phased array radar S-band dual-polarization Doppler radar |
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