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dc.contributor.authorLauvset, Siv Kari
dc.contributor.authorLange, Nico
dc.contributor.authorTanhua, Toste
dc.contributor.authorBittig, Henry C.
dc.contributor.authorOlsen, Are
dc.contributor.authorKozyr, Alex
dc.contributor.authorAlvarez, Marta
dc.contributor.authorBecker, Susan
dc.contributor.authorBrown, Pete
dc.contributor.authorCarter, Brendan R.
dc.contributor.authorDa Cunha, Leticia Cotrim
dc.contributor.authorFeely, Richard A
dc.contributor.authorvan Heuven, Steven
dc.contributor.authorHoppema, Mario
dc.contributor.authorIshii, Masao
dc.contributor.authorJeansson, Emil
dc.contributor.authorJutterström, Sara
dc.contributor.authorJones, Stephen Daniel
dc.contributor.authorKarlsen, Maren Kjos
dc.contributor.authorMonaco, Claire Lo
dc.contributor.authorMichaelis, Patrick
dc.contributor.authorMurata, Akihiko
dc.contributor.authorPerez, Fiz F
dc.contributor.authorPfeil, Gerrit Benjamin
dc.contributor.authorSchirnick, Carsten
dc.contributor.authorSteinfeldt, Reiner
dc.contributor.authorSuzuki, Toru
dc.contributor.authorTilbrook, Bronte
dc.contributor.authorVelo, Antón
dc.contributor.authorWanninkhof, Rik
dc.contributor.authorWoosley, Ryan J.
dc.contributor.authorKey, Robert M.
dc.description.abstractThe Global Ocean Data Analysis Project (GLODAP) is a synthesis effort providing regular compilations of surface-to-bottom ocean biogeochemical bottle data, with an emphasis on seawater inorganic carbon chemistry and related variables determined through chemical analysis of seawater samples. GLODAPv2.2021 is an update of the previous version, GLODAPv2.2020 (Olsen et al., 2020). The major changes are as follows: data from 43 new cruises were added, data coverage was extended until 2020, all data with missing temperatures were removed, and a digital object identifier (DOI) was included for each cruise in the product files. In addition, a number of minor corrections to GLODAPv2.2020 data were performed. GLODAPv2.2021 includes measurements from more than 1.3 million water samples from the global oceans collected on 989 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 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 World Ocean Circulation Experiment (WOCE) exchange format and (ii) as a merged data product with adjustments applied to minimize bias. For this annual update, adjustments for the 43 new cruises were derived by comparing those data with the data from the 946 quality controlled cruises in the GLODAPv2.2020 data product using crossover analysis. Comparisons to estimates of nutrients and ocean CO2 chemistry based on empirical algorithms provided additional context for adjustment decisions in 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 with 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 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 CO2 fugacity (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: 7 July 2021). 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 (Lauvset et al., 2021). These bias-adjusted product files also include significant ancillary and approximated data and can be accessed via (last access: 29 June 2021). These were obtained by interpolation of, or calculation from, measured data. This living data update documents the GLODAPv2.2021 methods and provides a broad overview of the secondary quality control procedures and results.en_US
dc.publisherCopernicus Publicationsen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleAn updated version of the global interior ocean biogeochemical data product, GLODAPv2.2021en_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.source.journalEarth System Science Dataen_US
dc.relation.projectNORCE Norwegian Research Centre AS: Internal fundingen_US
dc.identifier.citationEarth System Science Data. 2021, 13 (12), 5565-5589.en_US

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