https://www.ecmwf.int/en/elibrary/74351-ifs-documentation-cy36r1-part-v-ensemble-prediction-system
Chapter 1 TheoryChapter 2 Computational details: initial perturbationsChapter 3 Computational details: non-linear integrationsReferences
ifs documentationpart vensemblepredictionsystem
https://www.ecmwf.int/en/elibrary/81624-ifs-documentation-cy49r1-part-ii-data-assimilation
Chapter 1 Overview Chapter 2 4D variational assimilation Chapter 3 Tangent-linear physics Chapter 4 Background terms Chapter 5 Observation-related processing...
ifs documentationpart iidata assimilationecmwf