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Abstract

The Global Ocean Data Analysis Project (GLODAP) is asynthesis effort providing regular compilations of surface-to-bottom oceanbiogeochemical data, with an emphasis on seawater inorganic carbon chemistryand related variables determined through chemical analysis of seawatersamples. GLODAPv2.2020 is an update of the previous version, GLODAPv2.2019.The major changes are data from 106 new cruises added, extension of timecoverage to 2019, and the inclusion of available (also for historicalcruises) discrete fugacity of CO2 (fCO2) values in the mergedproduct files. GLODAPv2.2020 now includes measurements from more than 1.2 million water samples from the global oceans collected on 946 cruises. Thedata 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 afocus on systematic evaluation of bias. The data are available in twoformats: (i) as submitted by the data originator but updated to WOCEexchange format and (ii) as a merged data product with adjustments appliedto minimize bias. These adjustments were derived by comparing the data fromthe 106 new cruises with the data from the 840 quality-controlled cruises ofthe GLODAPv2.2019 data product using crossover analysis. Comparisons toempirical algorithm estimates provided additional context for adjustmentdecisions; this is new to this version. The adjustments are intended toremove potential biases from errors related to measurement, calibration, anddata-handling practices without removing known or likely time trends orvariations in the variables evaluated. The compiled and adjusted dataproduct 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−1in total alkalinity, 0.010.02 in pH (depending on region), and 5 % inthe halogenated transient tracers. The other variables included in thecompilation, such as isotopic tracers and discrete fCO2, were notsubjected to bias comparison or adjustments.

Item Type:	Article
Authors/Creators:	Lange, N and Key, RM and Tanhua, T and Bittig, HC and Kozyr, A and Alvarez, M and Azetsu-Scott, K and Becker, S and Brown, PJ and Carter, BR and Cotrim Da Cunha, L and Feely, RA and Van Heuven, S and Hoppema, M and Ishii, M and Jeansson, E and Jutterstrom, S and Landa, CS and Lauvset, SK and Michaelis, P and Murata, A and Perez, FF and Pfeil, B and Schirnick, C and Steinfeldt, R and Suzuki, T and Tilbrook, B and Velo, A and Wanninkhof, R and Woosley, RJ
Keywords:	GLODAP, biogeochemical data
Journal or Publication Title:	Earth System Science Data
Publisher:	Copernicus GmbH
ISSN:	1866-3508
DOI / ID Number:	https://doi.org/10.5194/essd-12-3653-2020
Copyright Information:	© 2020 Author(s). This work is distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, (https://creativecommons.org/licenses/by/4.0/)
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