Atmospheric REanalysis

Reanalysis integrates model data with observations worldwide to create a globally comprehensive and consistent dataset through the application of physical laws. This process, known as data assimilation, mirrors the methodology employed by numerical weather prediction centers. At regular intervals (e.g., every 12 hours at ECMWF), a previous forecast is merged with newly available observations using an optimal approach to generate a refined estimate of the atmospheric state, known as analysis. This analysis serves as the foundation for producing updated and enhanced forecasts.