Wind speed super-resolution and validation: from ERA5 to CERRA via diffusion models
This provides a faster, data-driven alternative for climate and renewable energy applications in Europe, though it is incremental as it applies an existing method to a new domain.
The paper tackled the problem of generating high-resolution wind speed data for Europe by using diffusion models to super-resolve lower-resolution ERA5 data to approximate the CERRA dataset, achieving results that closely mirror CERRA and validate well with ground measurements.
The Copernicus Regional Reanalysis for Europe, CERRA, is a high-resolution regional reanalysis dataset for the European domain. In recent years it has shown significant utility across various climate-related tasks, ranging from forecasting and climate change research to renewable energy prediction, resource management, air quality risk assessment, and the forecasting of rare events, among others. Unfortunately, the availability of CERRA is lagging two years behind the current date, due to constraints in acquiring the requisite external data and the intensive computational demands inherent in its generation. As a solution, this paper introduces a novel method using diffusion models to approximate CERRA downscaling in a data-driven manner, without additional informations. By leveraging the lower resolution ERA5 dataset, which provides boundary conditions for CERRA, we approach this as a super-resolution task. Focusing on wind speed around Italy, our model, trained on existing CERRA data, shows promising results, closely mirroring original CERRA data. Validation with in-situ observations further confirms the model's accuracy in approximating ground measurements.