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Both MERRA and NCEP CFSR use the GSI data assimilation, are they identical analysis routines?

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Both MERRA and NCEP CFSR use the GSI data assimilation, are they identical analysis routines?

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No. MERRA development and validation proceeded before NCEP CFSR, and so uses an older version of the GSI. The release date of the MERRA GSI is December 2005. The MERRA system is documented in the GEOS-5 Tech memo.

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