Comparison of reflectivity consistency between space-borne precipitation radar and ground-based weather radar in China and the United States
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Graphical Abstract
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Abstract
The Global Precipitation Measurement (GPM) dual-frequency precipitation radar (DPR) products (Version 07A), are employed for a rigorous comparative analysis with ground-based operational weather radar (GR) network. The reflectivity observed by GPM KuPR is compared quantitatively against GR from CINRAD of China and NEXRAD of the United States and volume matching method is used for spatial matching. Additionally, a novel frequency correction method for all phases as well as precipitation types is used to correct GPM KuPR radar frequency to GR frequency. The sensitivity test analysis of matching data revealed that correlations beyond a range of 150 km is weak, and below the bright band layer of the match samples (liquid phase particles) exhibit a commendable level of correlation. A total of 20 GRs (including 10 GRs of CINRAD and 10 GRs of NEXRAD) are participated in this comparative analysis. The results demonstrate that reflectivity from CINRAD and NEXRAD is better consistent with KuPR, with an average correlation of around 0.9. The root mean square error (RMSE) for CINRAD is calculated at 1.35 dB, whereas for NEXRAD, it is 1.63 dB. This study provides a method for comparing the consistency of satellite-ground radar reflectivity across different regions. The results can serve as a reference for comparing the consistency of satellite-ground radar reflectivity in various regions.
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