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An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2021


Lauvset, SK and Lange, N and Tanhua, T and Bittig, HC and Olsen, A and Kozyr, A and Alvarez, M 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 Jones, SD and Karlsen, MK and Lo Monaco, C 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 and Key, RM, An updated version of the global interior ocean biogeochemical data product, GLODAPv2.2021, Earth System Science Data, 13, (12) pp. 5565-5589. ISSN 1866-3508 (2021) [Refereed Article]

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DOI: doi:10.5194/essd-13-5565-2021


The 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.

Item Details

Item Type:Refereed Article
Keywords:GLODAP, seawater chemistry, 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:151896
Year Published:2021
Web of Science® Times Cited:9
Deposited By:Australian Antarctic Program Partnership
Deposited On:2022-08-08
Last Modified:2022-08-24

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