The inspection and evaluation of China's official weather radar software, Radar Operational Software Engineering version 2.1 (ROSE2.1), contributes to enhancing short-term forecasting and early warning systems, and refining the quantitative precipitation estimation (QPE) algorithm. For the four types of ROSE2.1 QPE products (078, 079, 169, and 170), a spatio-temporal matching and recalibrated evaluation index method is employed to analyze their performance across spatial distributions, seasonal variations, precipitation intensities, and precipitation types from 2021 to 2023. The results show that dual-polarization products outperform single-polarization ones in QPE capabilities, and OHP products are superior to THP products. Smaller precipitation levels and closer distances yield better accuracy. Within a radius of 50-150 km, dual-polarization products significantly improve upon single-polarization products, enhancing the accuracy of OHP and THP products by 25%-34% and 18%-32%, respectively. This improvement is likely due to better mitigation of ground clutter and building occlusion. The accuracy of OHP169 and THP170 products exceeds 80% within an area of 30 000 km² surrounding the Nanchang Radar Station.The accuracy is highest in spring, followed by summer and autumn, with winter exhibiting the lowest performance. Additionally, convective precipitation shows higher accuracy compared to stable precipitation.
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