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The latest release of SODA (SODA 2.1.6) covers the time period from January 1958 to December 2008. As part of the [[Data assimilation|data assimilation]] scheme, the system ingests a wide variety of observations including hydrographic profiles, ocean station data, moored temperature and salinity measurements, surface temperature and salinity observations from a variety of instruments (e.g., MBT, XBT, CTD), sea surface temperature (SST) from nighttime infrared observations from satellites, and satellite based sea level altimetry. Additionally, the numerical model used for forecasts is driven by surface winds from the [[European Centre for Medium-Range Weather Forecasts|European Center for Medium-Range Weather Forecasts]] [[ERA-40]] reanalysis data set during the period between 1958-2001,<ref name=cg2008> Carton, J.A. and B. Giese, 2008: A Reanalysis of Ocean Climate Using Simple Ocean Data Assimilation (SODA). ''Mon. Weath. Rev. '', '''136''', 2999-3017.</ref> and from the [[QuickSCAT]] scatterometer for 2002-2008.<ref name=cg2005> Carton, J.A. and B. Giese, 2005: SODA: A Reanalysis of Ocean Climate. [online] Available at: <http://www.atmos.umd.edu/~carton/pdfs/carton&giese05.pdf> [Accessed 26 November 2012].</ref> The state variable forecasts used in the assimilation are calculated using a general circulation model based on [[Parallel Ocean Program]] numerics with an average horizontal resolution of 0.25°x0.4°, and 40 vertical layers, which have 10-meter vertical resolution near the surface. Starting with version 1.4.2, the ocean model is run using a displaced pole grid configuration, allowing for the representation of [[Arctic Ocean]] processes. The data assimilation method used is based on a sequential analysis with a 10-day update cycle. <ref name=cg2008/>
The reanalysis data is packaged into monthly means from January 1958 to December 2008 (although five day means are also available) and stored in [[NetCDF]] format. Standard state variables were calculated including temperature, salinity, zonal and meridional velocities, and sea level, as well as several derived fields such as heat content. Finalized data was remapped from
In addition to the 61-year reanalysis data set, a “beta” version (i.e., currently being evaluated), SODA 2.2.4, was released in 2010 and extends from 1871 to 2008 with monthly temporal resolution. This extended analysis is identical in horizontal and vertical spatial resolution as the standard reanalysis data set (SODA 2.1.6), and includes similar output variables.<ref name=IRIDL> IRI Data Library, 2012. ''Carton-Giese SODA SODA 2.2.4, 1871-2008 Assimilation Run''. [online] Available at: <http://iridl.ldeo.columbia.edu/SOURCES/.CARTON-GIESE/.SODA/.v2p2p4/> [Accessed 26 Noevember 2012]. </ref>
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