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Discussion papers
https://doi.org/10.5194/essd-2019-66
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2019-66
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 30 Apr 2019

Research article | 30 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).

GLODAPv2.2019 – an update of GLODAPv2

Are Olsen1, Nico Lange2, Robert M. Key3, Toste Tanhua2, Marta Álvarez4, Susan Becker5, Henry C. Bittig6, Brendan R. Carter7,8, Leticia Cotrim da Cunha9, Richard A. Feely8, Steven van Heuven10, Mario Hoppema11, Masao Ishii12, Emil Jeansson13, Steve D. Jones1, Sara Jutterström14, Maren K. Karlsen1, Alex Kozyr15, Siv K. Lauvset13,1, Claire Lo Monaco16, Akihiko Murata17, Fiz F. Pérez18, Benjamin Pfeil1, Carsten Schirnick2, Reiner Steinfeldt19, Toru Suzuki20, Maciej Telszewski21, Bronte Tilbrook22, Anton Velo18, and Rik Wanninkhof23 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
  • 4Instituto Español de Oceanografía, A Coruña, Spain
  • 5UC San Diego, Scripps Institution of Oceanography, San Diego CA 9209
  • 6Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany
  • 7Joint Institute for the Study of the Atmosphere and Ocean, University Washington, Seattle, Washington, USA
  • 8Pacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, Washington, USA
  • 9Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro (RJ), Brazil
  • 10Centre for Isotope Research, Faculty of Science andEngineering, University of Groningen, the Netherlands
  • 11Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
  • 12Oceanography and Geochemistry Research Department, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • 13NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
  • 14IVL Swedish Environmental Research Institute, Gothenburg, Sweden
  • 15NOAA National Centers for Environmental Information, Silver Spring, MD, USA
  • 16LOCEAN, CNRS, Sorbonne Université, Paris, France
  • 17Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
  • 18Instituto de Investigaciones Marinas, IIM – CSIC, Vigo, Spain
  • 19University of Bremen, Institute of Environmental Physics, Bremen, Germany
  • 20Marine Information Research Center, Japan Hydrographic Association, Tokyo, Japan
  • 21International Ocean Carbon Coordination Project, Institute of Oceanology of Polish Academy of Sciences, Sopot, Poland
  • 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

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 40 chemistry and related variables determined through chemical analysis of water samples. This update of GLODAPv2, v2.2019, adds data from 116 cruises to the previous version, extending its coverage in time from 2013 to 2017 while also adding some data from prior years. GLODAPv2.2019 includes measurements from more than 1.1 million water samples from the global oceans collected on 840 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 been subjected to 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 116 new cruises with the data from the 724 quality-controlled cruises of the GLODAPv2 data product. They correct for errors related to measurement, calibration, and data handling practices, taking into account any known or likely time trends or variations. The compiled and adjusted data product is believed to be consistent to better that 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 in pH, and 5 % in the halogenated transient tracers. The compilation also includes data for several other variables, such as isotopic tracers. These 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 (https://www.nodc.noaa.gov/ocads/oceans/GLODAPv2_2019/). This site also provides access to the merged data product, which is provided as a single global file or as four regional ones – the Arctic, Atlantic, Indian, and Pacific oceans – under the doi: https://doi.org/10.25921/xnme-wr20 (Olsen et al., 2019). The product files also include significant ancillary and approximated data. These were obtained by interpolation of, or calculation from, measured data. This paper documents the GLODAPv2.2019 methods and provides a broad overview of the secondary quality control results.

Are Olsen et al.
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Data sets

Global Ocean Data Analysis Project version 2.2019 (GLODAPv2.2019) A. Olsen, N. Lange, R. M. Key, T. Tanhua, M. Álvarez, S. Becker, H. C. Bittig, B. R. Carter, L. Cotrim da Cunha, R. A. Feely, S. M. A. C. van Heuven, M. Hoppema, M. Ishii, E. Jeansson, S. D. Jones, S. Jutterström, M. K. Karlsen, A. Kozyr, S. K. Lauvset, C. Lo Monaco, A. Murata, F. F. Pérez, B. Pfeil, C. Schirnick, R. Steinfeldt, T. Suzuki, M. Telszewski, B. Tilbrook, A. Velo, and R. Wanninkhof https://doi.org/10.25921/xnme-wr20

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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. GLODAPv2.2019 is the first 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 840 hydrographic cruises covering the world's oceans from 1972–2017.
GLODAP is a data product for ocean inorganic carbon and related biogeochemical variables...
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