SPARC S-RIP is a coordinated activity to compare all (or some of the newer) reanalysis data sets for various "key" diagnostics, to understand the causes of the differences, to use the results to provide guidance on appropriate usage of various reanalysis products in scientific studies, and to connect such activities with future improvements of the reanalysis products.
Contribution of IMK-ASF: Provide observational data (e.g. age of stratospheric air) for direct validation of key diagnostics of reanalyses, compare modeled fields based on reanalyses to observational data for further validation.