SOCAT version 2021

Before using SOCAT data products, please read the Fair Data Use Statement

Data Access

SOCAT version 2021 data products are available in a variety of formats. Please provide feedback about issues (data usage or updated data submissions of existing data) to

Interactive viewers

Use the Interactive Viewers from the Live Access Server to explore and download gridded or non-gridded data following selected criteria (region, year, platform, etc.). Making maps and property plots is straight forward and a good way to to get a quick overview of the data collection.

Synthesis and gridded files

Global and regional synthesis files, as well as gridded files, are available as text files and netcdf, respectively, via the OCADS Metadata Page at the National Centers for Environmental Information. Matlab code is available for reading these text files.

Synthesis files Main source (NCEI) BCDC Mirror (Zipped)
All 5.7 Gb 939 Mb
Arctic 324 Mb 50 Mb
Coastal 2.5 Gb 421 Mb
Indian Ocean 61 Mb 7 Mb
North Atlantic 458 Mb 79 Mb
North Pacific 168 Mb 29 Mb
Southern Oceans 1.4 Gb 229 Mb
Tropical Atlantic 251 Mb 42 Mb
Tropical Pacific 533 Mb 210 Mb
Flag E 364 Mb 52 Mb
Instructions for reading synthesis files 927 Kb
Matlab code for reading synthesis files 19 Kb
Gridded files Main source (NCEI) BCDC Mirror (Zipped)
Monthly (nc) 3.5 Gb 35 Mb
Monthly (csv) 40 Mb 13 Mb
Yearly (nc) 206 Mb 10 Mb
Yearly (csv) 22 Mb 6 Mb
Decadal (nc) 20 Mb 3 Mb
Decadal (csv) 8 Mb 2 Mb
Quarter-degree monthly coastal (nc) 372 Mb 135 Mb
Quarter-degree monthly coastal (csv) 99 Mb 32 Mb
Matlab code for reading gridded files 7.5 Kb
Ocean Data View format

The synthesis and gridded files are available in Ocean Data View (ODV) format from the ODV website.


More description on SOCAT version 2021 can be found in the version 2021 release poster.
For a detailed description of data products, file formats and tools, see:

Bakker et al. (2016) A multi-decade record of high quality fCO₂ data in version 3 of the Surface Ocean CO₂ Atlas (SOCAT). Earth System Science Data, 8: 383-413. doi:10.5194/essd-8-383-2016
Bakker et al. (2014) An update to the Surface Ocean CO₂ Atlas (SOCAT version 2). Earth System Science Data 6: 69-90. doi:10.5194/essd-6-69-2014
Pfeil et al. (2013) A uniform, quality controlled Surface Ocean CO₂ Atlas (SOCAT), Earth Syst. Sci. Data, 5, 125-143. doi:10.5194/essd-5-125-2013
Sabine et al. (2013) Surface Ocean CO2 Atlas (SOCAT) gridded data products. Earth System Science Data 5: 145-153. doi:10.5194/essd-5-145-2013


Recalculation in SOCAT version 2021 took place using Ferret scripts, based on Matlab codes by Are Olsen (University of Bergen/Bjerknes Centre for Climate Research). The Matlab codes can be obtained here.


For SOCAT version 2021 we would like to thank all SOCAT data contributors, quality controllers, and members of the automation team:

Bakker, Dorothee.C.E.; Alin Simone, R.; Castaño-Primo, Rocio; Cronin, Margot; Gkritzalis, Thanos; Kozyr, Alex; Lauvset, Siv K.; Metzl, Nicolas; Munro, David R; Nakaoka, Shin-Ichiro; O’Brien, Kevin M.; Olsen, Are; Omar, Abdirahman M.; Pfeil, Benjamin; Pierrot, Denis; Rodriguez, Carmen; Steinhoff, Tobias; Sutton, Adrianne; Tilbrook, Bronte; Wanninkhof, Rik; Willstrand, Anne; Ahmed, Mohamed; Andersson, Andreas; Apelthun, Lise B.; Bates, Nicholas R.; Battisti, Roman; Beaumont, Laurence; Becker, Meike; Benoit-Cattin-Breton, Alice; Berghoff, C.; Boutin, Jacqueline; Burger, Eugene; Burgers, Tonya; Cantoni, Carolina; Cattrijsse, André; Chierici, Melissa; Coppola, Laurent; Cosca, Cathy; Cross, Jessica; Currie, Kim; De Carlo, Eric; Else, Brent; Enright, Matt; Ericson, Y.; Evans, Wiley; Feely, Richard A.; Fiedler, Björn; Fransson, Agneta; García-Ibáñez, Maribel; Gehrung, Martina; Glockzin, Michael; González-Dávila, Melchor; Gutekunst, Sören; Hermes, R.; Humphreys, Matthew P.; Hunt, Christopher W.; Ibanhez, J. S. P; Jones, Stephen D.; Kitidis, Vassilis; Kosugi, Naohiro; Körtzinger, Arne; Landa, Camilla S.; Landschützer, Peter; Lefèvre, Nathalie; Lo Monaco, Claire; Luchetta, Anna; Lutz, V.; Macovei, Vlad; Manke, Ansley B.; Merlivat, Liliane M.; Millero, Frank J.; Monacci, Natalie; Negri, R.; Newberger, Timothy; Newton, Jan A.; Nickford, S.; Nojiri, Yukihiro; Ohman, Mark; Ólafsdóttir, Sólveig Rósa; Ono, Tsuneo; Palter, J.; Papakyriakou, Tim; Petersen, W.; Plueddemann, Albert J.; Qi, Di; Rehder, Gregor; Ritschel, M.; Rutgersson, Anna; Sabine, Christopher L.; Salisbury, Joe; Santana Casiano, J. M Magdalena; Schlitzer, Reiner; Send, Uwe; Skjelvan, Ingunn; Smith, Karl; Sparnocchia, Stefania; Sullivan, Kevin; Sutherland, Stewart C.; Sweeney, Colm; Szuts, Z.; Tadokoro, Kazuaki; Tanhua, Toste; Telszewski, Maciej; Theetaert, Hannelore; Vandemark, Doug; Voynova, Yoana; Wada, Chisato; Weller, Robert A.; Woosley, Ryan J.


SOCAT quality control is carried out by regional working groups with a global group for coordination. The groups for SOCAT version 2021 can be found here.