An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020
<p>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 seawater samples. GLODAP...
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Language: | English |
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Copernicus Publications
2020-12-01
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Series: | Earth System Science Data |
Online Access: | https://essd.copernicus.org/articles/12/3653/2020/essd-12-3653-2020.pdf |
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Article |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
A. Olsen N. Lange R. M. Key T. Tanhua H. C. Bittig A. Kozyr M. Álvarez K. Azetsu-Scott S. Becker P. J. Brown B. R. Carter B. R. Carter L. Cotrim da Cunha R. A. Feely S. van Heuven M. Hoppema M. Ishii E. Jeansson S. Jutterström C. S. Landa S. K. Lauvset P. Michaelis A. Murata F. F. Pérez B. Pfeil C. Schirnick R. Steinfeldt T. Suzuki B. Tilbrook A. Velo R. Wanninkhof R. J. Woosley |
spellingShingle |
A. Olsen N. Lange R. M. Key T. Tanhua H. C. Bittig A. Kozyr M. Álvarez K. Azetsu-Scott S. Becker P. J. Brown B. R. Carter B. R. Carter L. Cotrim da Cunha R. A. Feely S. van Heuven M. Hoppema M. Ishii E. Jeansson S. Jutterström C. S. Landa S. K. Lauvset P. Michaelis A. Murata F. F. Pérez B. Pfeil C. Schirnick R. Steinfeldt T. Suzuki B. Tilbrook A. Velo R. Wanninkhof R. J. Woosley An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020 Earth System Science Data |
author_facet |
A. Olsen N. Lange R. M. Key T. Tanhua H. C. Bittig A. Kozyr M. Álvarez K. Azetsu-Scott S. Becker P. J. Brown B. R. Carter B. R. Carter L. Cotrim da Cunha R. A. Feely S. van Heuven M. Hoppema M. Ishii E. Jeansson S. Jutterström C. S. Landa S. K. Lauvset P. Michaelis A. Murata F. F. Pérez B. Pfeil C. Schirnick R. Steinfeldt T. Suzuki B. Tilbrook A. Velo R. Wanninkhof R. J. Woosley |
author_sort |
A. Olsen |
title |
An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020 |
title_short |
An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020 |
title_full |
An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020 |
title_fullStr |
An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020 |
title_full_unstemmed |
An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020 |
title_sort |
updated version of the global interior ocean biogeochemical data product, glodapv2.2020 |
publisher |
Copernicus Publications |
series |
Earth System Science Data |
issn |
1866-3508 1866-3516 |
publishDate |
2020-12-01 |
description |
<p>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 seawater
samples. GLODAPv2.2020 is an update of the previous version, GLODAPv2.2019.
The major changes are data from 106 new cruises added, extension of time
coverage to 2019, and the inclusion of available (also for historical
cruises) discrete fugacity of <span class="inline-formula">CO<sub>2</sub></span> (<span class="inline-formula"><i>f</i>CO<sub>2</sub></span>) values in the merged
product files. GLODAPv2.2020 now 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 <span class="inline-formula">CCl<sub>4</sub></span>) have undergone extensive quality control with a
focus on 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 using crossover analysis. Comparisons to
empirical algorithm estimates provided additional context for adjustment
decisions; this is new to this version. The adjustments are intended to
remove potential biases from errors related to measurement, calibration, and
data-handling practices without removing 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 <span class="inline-formula">µmol kg<sup>−1</sup></span> in dissolved inorganic carbon, 4 <span class="inline-formula">µmol kg<sup>−1</sup></span>
in total alkalinity, 0.01–0.02 in pH (depending on region), and 5 % in
the halogenated transient tracers. The other variables included in the
compilation, such as isotopic tracers and discrete <span class="inline-formula"><i>f</i>CO<sub>2</sub></span>, were not
subjected to bias comparison or adjustments.</p>
<p>The original data and their documentation and DOI codes are available at the
Ocean Carbon Data System of NOAA NCEI
(<span class="uri">https://www.nodc.noaa.gov/ocads/oceans/GLODAPv2_2020/</span>, last
access: 20 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 <a href="https://doi.org/10.25921/2c8h-sa89">https://doi.org/10.25921/2c8h-sa89</a> (Olsen et al., 2020). These
bias-adjusted 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.</p> |
url |
https://essd.copernicus.org/articles/12/3653/2020/essd-12-3653-2020.pdf |
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doaj-4d27ad6ff4004ae6815692a3808a275a2020-12-23T09:23:27ZengCopernicus PublicationsEarth System Science Data1866-35081866-35162020-12-01123653367810.5194/essd-12-3653-2020An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020A. Olsen0N. Lange1R. M. Key2T. Tanhua3H. C. Bittig4A. Kozyr5M. Álvarez6K. Azetsu-Scott7S. Becker8P. J. Brown9B. R. Carter10B. R. Carter11L. Cotrim da Cunha12R. A. Feely13S. van Heuven14M. Hoppema15M. Ishii16E. Jeansson17S. Jutterström18C. S. Landa19S. K. Lauvset20P. Michaelis21A. Murata22F. F. Pérez23B. Pfeil24C. Schirnick25R. Steinfeldt26T. Suzuki27B. Tilbrook28A. Velo29R. Wanninkhof30R. J. Woosley31Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, NorwayGEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, GermanyAtmospheric and Oceanic Sciences, Princeton University, Princeton, NJ, 08540, USAGEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, GermanyLeibniz Institute for Baltic Sea Research Warnemünde, Rostock, GermanyNOAA National Centers for Environmental Information, Silver Spring, MD, USAInstituto Español de Oceanografía, A Coruña, SpainDepartment of Fisheries and Oceans, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, CanadaUC San Diego, Scripps Institution of Oceanography, San Diego, CA 92093, USANational Oceanography Centre, Southampton, UKCooperative Institute for Climate, Ocean and Ecosystem Studies, University of Washington, Seattle, Washington, USAPacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, Washington, USAFaculdade de Oceanografia/PPG-OCN/LABOQUI, Universidade do Estado do Rio de Janeiro, Rio de Janeiro (RJ), BrazilPacific Marine Environmental Laboratory, National Oceanic and Atmospheric Administration, Seattle, Washington, USACentre for Isotope Research, Faculty of Science and Engineering, University of Groningen, Groningen, the NetherlandsAlfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, GermanyOceanography and Geochemistry Research Department, Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, JapanNORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, NorwayIVL Swedish Environmental Research Institute, Gothenburg, SwedenGeophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, NorwayNORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, NorwayGEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, GermanyResearch Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, JapanInstituto de Investigaciones Marinas, IIM – CSIC, Vigo, SpainGeophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, NorwayGEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, GermanyInstitute of Environmental Physics, University of Bremen, Bremen, GermanyMarine Information Research Center, Japan Hydrographic Association, Tokyo, JapanCSIRO Oceans and Atmosphere and Antarctic Climate and Ecosystems Co-operative Research Centre, University of Tasmania, Hobart, AustraliaInstituto de Investigaciones Marinas, IIM – CSIC, Vigo, SpainAtlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, Miami, USACenter for Global Change Science, Massachusetts Institute for Technology, Cambridge, Massachusetts, USA<p>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 seawater samples. GLODAPv2.2020 is an update of the previous version, GLODAPv2.2019. The major changes are data from 106 new cruises added, extension of time coverage to 2019, and the inclusion of available (also for historical cruises) discrete fugacity of <span class="inline-formula">CO<sub>2</sub></span> (<span class="inline-formula"><i>f</i>CO<sub>2</sub></span>) values in the merged product files. GLODAPv2.2020 now 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 <span class="inline-formula">CCl<sub>4</sub></span>) have undergone extensive quality control with a focus on 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 using crossover analysis. Comparisons to empirical algorithm estimates provided additional context for adjustment decisions; this is new to this version. The adjustments are intended to remove potential biases from errors related to measurement, calibration, and data-handling practices without removing 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 <span class="inline-formula">µmol kg<sup>−1</sup></span> in dissolved inorganic carbon, 4 <span class="inline-formula">µmol kg<sup>−1</sup></span> in total alkalinity, 0.01–0.02 in pH (depending on region), and 5 % in the halogenated transient tracers. The other variables included in the compilation, such as isotopic tracers and discrete <span class="inline-formula"><i>f</i>CO<sub>2</sub></span>, were not subjected to bias comparison or adjustments.</p> <p>The original data and their documentation and DOI codes are available at the Ocean Carbon Data System of NOAA NCEI (<span class="uri">https://www.nodc.noaa.gov/ocads/oceans/GLODAPv2_2020/</span>, last access: 20 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 <a href="https://doi.org/10.25921/2c8h-sa89">https://doi.org/10.25921/2c8h-sa89</a> (Olsen et al., 2020). These bias-adjusted 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.</p>https://essd.copernicus.org/articles/12/3653/2020/essd-12-3653-2020.pdf |