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A reanalysis of
ocean climate

Introduction As its name implies, the Simple Ocean Data Assimilation ocean/sea ice reanalysis (SODA) uses a simple architecture based on community standard codes with resolution chosen to match available data and the scales of motion that are resolvable. Agreement with direct measurements (to within observational error estimates) as well as unbiased statistics are expected. While SODA remains a university-based research project, we want to be helpful. Our goal is to be a reliable source of seasonal climate time-scale ocean reanalysis to complement the atmospheric reanalyses available elsewhere (NOAA/EMC, NASA/GMAO, and ECMWF, for example).

SODA Version 3 represents a major change from the previous SODA2. It now uses GFDL MOM5/SIS numerics at finer 1/4°x1/4°x50lev resolution, similar to the ocean component of the GFDL CM2.5 coupled climate model, and includes an active sea ice component. The Optimal Interpolation filter has also been augmented (relative to previous releases) with bias correction in order to allow for reduced bias in estimates of long term trends.

News 12September, 2016 The first releases of SODA3: SODA3.3.x, spanning the 36-year period 1980-2015, will be available from this website beginning this month (we're in year 2010 as of this writing). The reanalysis will be provided remapped onto a 1/2°x1/2°x1mo Mercator horizontal grid similar to SODA2, but with expanded vertical resolution and available at both 5dy and monthly resolution. We will release the reanalysis on its native 1/4°x1/4°x50levx5dy tripolar grid as soon as our storage system gets upgraded (later this fall). Next we will complete the three member ensemble of SODA3 reanalyses:

The spread in these should provide information regarding the uncertainty due to errors in surface forcing. A manuscript describing SODA3 is in draft form. Additional ensemble members will be added along with a series of system upgrades, which will keep us busy for much of 2017. Meanwhile we will complete the analysis of year 2016 by July 2017 (the 6 month lag behind 'real-time' is partly due to the delay in getting the hydrography). By late-2017 we expect to return to the task of completing a reanalysis of the first half of the 20th century.

Contact us for additional information at: Gena Chepurin and Jim Carton. If you don't get a response we've gotten distracted. Please keep trying!

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Acknowledgements SODA relies on extensive collaborations. In addition to the National Science Foundation we owe debts to: the NOAA/GFDL, NOAA/NCEP, NOAA/NESDIS and in particular the Laboratory for Satellite Altimetry and NCEI, and NASA/GMAO and the NASA Physical Oceanography program. Many individuals have contributed to SODA including: Tim Boyer, Gil Compo, Dick Dee, Eric Hackert, Sirpa Hakkinen, Sasha Ignatov, Eugenia Kalnay, Syd Levitus, Matt Maltrud, Julie McClean, Laury Miller, Steve Penny, R. Raghunath, James Reagan, Tony Santorelli, Mike Steele, and most notably Ben Giese, Xianhe Cao, and Hank Seidel.

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