Please see the Reanalysis-2 home page at the following URL: http://www.cpc.ncep.noaa.gov/products/wesley/reanalysis2/index.html.
The data can be found here. This data set is being served through the IRI Data Library via the NCEP NOMAD1 and NOMAD6 GrADS-DODS servers.
7/15/2008: A compile problem with R2 source code was discovered. The April-June 2008 analyses and associated data have been redone.
The SSI code was recompiled April 3, 2008 to increase the size of the observation arrays. The source code changes were checked by two other people. However, it is believed that the code was compiled using an old BUFR library. The fields had the right large scale structure (warm tropics, cold poles) but had larger than expected deviations from CDAS. The code was recompiled May 28, 2008 with the new BUFR library. After May 28th, the deviations from CDAS returned to normal.
Please replace all R2 analyses downloaded from NOMADS before July 15, 2008 with the updated versions.
Kanamitsu, M., W. Ebisuzaki, J. Woollen, S. K. Yang, J. J. Hnilo, M. Fiorino, and G. L. Potter, 2002: NCEP-DOE AMIP-II Reanalysis (R-2). Bull. Amer. Meteor. Soc., 83, 1631-1643.