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Reanalysis generate not only analysis fields but also quality information on each observation (O-A and O-F statistics, and bias estimation, etc ). Reanalysis now goes towards end of third generation of comprehensive global reanalysis. Should balance be enforced or used as a diagnostic?
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Reanalysis generate not only analysis fields but also quality information on each observation (O-A and O-F statistics, and bias estimation, etc). • Reanalysis now goes towards end of third generation of comprehensive global reanalysis. • Should balance be enforced or used as a diagnostic? • Validation by comparison with other re-analyses becomes usual. • Validation with O-A and O-B statistics, and diagnostics with analysis tendency is useful. • Next generation re-analyses are required improve hydrological cycle, stratosphere, polar region, uncertainty estimates, Reducing trend jump and analysis increments, Earth system analysis. • Ensemble based analysis can generate information of uncertainty. • 20thcentury reanalysis with Ps and sst will start • Reprocessed observation data (ex, AMV and CSR, etc) are useful. • Background error for non-satellite era is useful. • Ultimately the accuracy of a reanalysis is limited by observations. • New data for ocean analysis: GRADE, SMOS. • Atmosphere and ocean coupled reanalysis.
