Global spatio-temporal downscaling of ERA5 precipitation through generative AI

• URL: http://arxiv.org/abs/2411.16098v1
• Date: Fri, 22 Nov 2024 14:11:23 GMT
• Title: Global spatio-temporal downscaling of ERA5 precipitation through generative AI
• Authors: Luca Glawion, Julius Polz, Harald Kunstmann, Benjamin Fersch, Christian Chwala,
• Abstract summary: We introduce SpateGAN-ERA5, the first deep learning based-temporal downscaling of precipitation data on a global scale. SpateGAN-ERA5 uses a conditional generative adversarial neural network (cGAN) that enhances the spate of ERA5 precipitation data 24 km and 1 hour to 2 km and 10 minutes. It delivers high-resolution rainfall fields with realistic, large-temporal patterns and accurate rain rate distribution including extremes.
• Score: 3.320484236699228
• License:
• Abstract: The spatial and temporal distribution of precipitation has a significant impact on human lives by determining freshwater resources and agricultural yield, but also rainfall-driven hazards like flooding or landslides. While the ERA5 reanalysis dataset provides consistent long-term global precipitation information that allows investigations of these impacts, it lacks the resolution to capture the high spatio-temporal variability of precipitation. ERA5 misses intense local rainfall events that are crucial drivers of devastating flooding - a critical limitation since extreme weather events become increasingly frequent. Here, we introduce spateGAN-ERA5, the first deep learning based spatio-temporal downscaling of precipitation data on a global scale. SpateGAN-ERA5 uses a conditional generative adversarial neural network (cGAN) that enhances the resolution of ERA5 precipitation data from 24 km and 1 hour to 2 km and 10 minutes, delivering high-resolution rainfall fields with realistic spatio-temporal patterns and accurate rain rate distribution including extremes. Its computational efficiency enables the generation of a large ensemble of solutions, addressing uncertainties inherent to the challenges of downscaling. Trained solely on data from Germany and validated in the US and Australia considering diverse climate zones, spateGAN-ERA5 demonstrates strong generalization indicating a robust global applicability. SpateGAN-ERA5 fulfils a critical need for high-resolution precipitation data in hydrological and meteorological research, offering new capabilities for flood risk assessment, AI-enhanced weather forecasting, and impact modelling to address climate-driven challenges worldwide.

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