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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  31 Jul 2020

31 Jul 2020

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This preprint is currently under review for the journal ESSD.

GLODAPv2.2020 – the second update of GLODAPv2

Are Olsen1, Nico Lange2, Robert M. Key3, Toste Tanhua2, Henry C. Bittig4, Alex Kozyr5, Marta Àlvarez6, Kumiko Azetsu-Scott7, Susan Becker8, Peter J. Brown9, Brendan R. Carter10,11, Leticia Cotrim da Cunha12, Richard A. Feely11, Steven van Heuven13, Mario Hoppema14, Masao Ishii15, Emil Jeansson16, Sara Jutterström17, Camilla S. Landa1, Siv K. Lauvset16, Patrick Michaelis2, Akihiko Murata18, Fiz F. Pérez19, Benjamin Pfeil1, Carsten Schirnick2, Reiner Steinfeldt20, Toru Suzuki21, Bronte Tilbrook22, Anton Velo19, Rik Wanninkhof23, and Ryan J. Woosley24 Are Olsen et al.
  • 1Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway
  • 2GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
  • 3Atmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, 08540, USA
  • 4Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany
  • 5NOAA National Centers for Environmental Information, Silver Spring, MD, USA
  • 6Instituto Español de Oceanografía, A Coruña, Spain
  • 7Departement of Fisheries and Oceans, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada
  • 8UC San Diego, Scripps Institution of Oceanography, San Diego CA 92093, USA
  • 9National Oceanography Centre, Southampton, UK
  • 10Joint Institute for the Study of the Atmosphere and Ocean, University Washington, Seattle, Washington, USA
  • 11Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, Washington, USA
  • 12Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro (RJ), Brazil
  • 13Centre for Isotope Research, Faculty of Science and Engineering, University of Groningen, Groningen, the Netherlands
  • 14Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
  • 15Oceanography and Geochemistry Research Department, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • 16NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
  • 17IVL Swedish Environmental Research Institute, Gothenburg, Sweden
  • 18Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
  • 19Instituto de Investigaciones Marinas, IIM – CSIC, Vigo, Spain
  • 20University of Bremen, Institute of Environmental Physics, Bremen, Germany
  • 21Marine Information Research Center, Japan Hydrographic Association, Tokyo, Japan
  • 22CSIRO Oceans and Atmosphere and Antarctic Climate and Ecosystems Co-operative Research Centre, University of Tasmania, Hobart, Australia
  • 23Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, Miami, USA
  • 24Center for Global Change Science, Massachusetts Institute for Technology, Cambridge, Massachusetts, USA

Abstract. The Global Ocean Data Analysis Project (GLODAP) is a synthesis effort providing regular compilations of surface to bottom ocean biogeochemical data, with an emphasis on seawater inorganic carbon chemistry and related variables determined through chemical analysis of water samples. GLODAPv2.2020 is an update of the previous version, GLODAPv2.2019. The major changes are: data from 106 more cruises added, extension of time coverage until 2019, and the inclusion of available discrete fugacity of CO2 (fCO2) values in the merged product files. GLODAPv2.2020 includes measurements from more than 1.2 million water samples from the global oceans collected on 946 cruises. The data for the 12 GLODAP core variables (salinity, oxygen, nitrate, silicate, phosphate, dissolved inorganic carbon, total alkalinity, pH, CFC-11, CFC-12, CFC-113, and CCl4) have undergone extensive quality control, especially systematic evaluation of bias. The data are available in two formats: (i) as submitted by the data originator but updated to WOCE exchange format and (ii) as a merged data product with adjustments applied to minimize bias. These adjustments were derived by comparing the data from the 106 new cruises with the data from the 840 quality-controlled cruises of the GLODAPv2.2019 data product. They correct for errors related to measurement, calibration, and data handling practices, while taking into account any known or likely time trends or variations in the variables evaluated. The compiled and adjusted data product is believed to be consistent to better than 0.005 in salinity, 1 % in oxygen, 2 % in nitrate, 2 % in silicate, 2 % in phosphate, 4 μmol kg−1 in dissolved inorganic carbon, 4 μmol kg−1 in total alkalinity, 0.01–0.02, depending on region, in pH, and 5 % in the halogenated transient tracers. The other variables included in the compilation, such as isotopic tracers and discrete fCO2 were not subjected to bias comparison or adjustments.

The original data, their documentation and doi codes are available at the Ocean Carbon Data System of NOAA NCEI (, last access: 22 June 2020). This site also provides access to the merged data product, which is provided as a single global file and as four regional ones – the Arctic, Atlantic, Indian, and Pacific oceans – under (Olsen et al., 2020). The bias corrected product files also include significant ancillary and approximated data. These were obtained by interpolation of, or calculation from, measured data. This living data update documents the GLODAPv2.2020 methods and provides a broad overview of the secondary quality control procedures and results.

Are Olsen et al.

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Are Olsen et al.

Data sets

Global ocean data analysis project version 2.2020 (GLODAPv2.2020) Are Olsen, Nico Lange, Robert M. Key, Toste Tanhua, Henry C. Bittig, Alex Kozyr, Marta Àlvarez, Kumiko Azetsu-Scott, Susan Becker, Peter J. Brown, Brendan R. Carter, Leticia Cotrim da Cunha, Richard A. Feely, Steven van Heuven, Mario Hoppema, Masao Ishii, Emil Jeansson, Sara Jutterström, Camilla S. Landa, Siv K. Lauvset, Patrick Michaelis, Akihiko Murata, Fiz F. Pérez, Benjamin Pfeil, Carsten Schirnick, Reiner Steinfeldt, Toru Suzuki, Bronte Tilbrook, Anton Velo, Rik Wanninkhof, and Ryan J. Woosley

Are Olsen et al.


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Latest update: 12 Aug 2020
Short summary
GLODAP is a data product for ocean inorganic carbon and related biogeochemical variables measured by chemical analysis of water bottle samples at scientific cruises. GLODAPv2.2020 is the second update of GLODAPv2 from 2016. The data that are included have been subjected to extensive quality control, including systematic evaluation of measurement biases. This version contains data from 946 hydrographic cruises covering the world's oceans from 1972 to 2019.
GLODAP is a data product for ocean inorganic carbon and related biogeochemical variables...