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An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020

Citation

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, An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2020, Earth System Science Data, 12, (4) pp. 3653-3678. ISSN 1866-3508 (2020) [Refereed Article]


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Copyright Statement

© 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/)

DOI: doi:10.5194/essd-12-3653-2020

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 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 CO2 (fCO2) 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 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 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 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 fCO2, were not subjected to bias comparison or adjustments.

Item Details

Item Type:Refereed Article
Keywords:GLODAP, biogeochemical data
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical oceanography
Objective Division:Environmental Management
Objective Group:Marine systems and management
Objective Field:Oceanic processes (excl. in the Antarctic and Southern Ocean)
UTAS Author:Tilbrook, B (Dr Bronte Tilbrook)
ID Code:151898
Year Published:2020
Web of Science® Times Cited:42
Deposited By:Australian Antarctic Program Partnership
Deposited On:2022-08-08
Last Modified:2022-09-29
Downloads:0

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