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GLODAPv2.2019 - an update of GLODAPv2

Citation

Olsen, A and Lange, N and Key, RM and Tanhua, T and Alvarez, M and Becker, S and Bittig, HC 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 Jones, SD and Jutterstrom, S and Karlsen, MK and Kozyr, A and Lauvset, SK and Lo Monaco, C and Murata, A and Perez, FF and Pfeil, B and Schirnick, C and Steinfeldt, R and Suzuki, T and Telszewski, M and Tilbrook, B and Velo, A and Wanninkhof, R, GLODAPv2.2019 - an update of GLODAPv2, Earth System Science Data, 11, (3) pp. 1437-1461. ISSN 1866-3508 (2019) [Refereed Article]


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Copyright 2019 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.5194/essd-11-1437-2019

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 water samples. This update of GLODAPv2, v2.2019, adds data from 116 cruises to the previous version, extending its coverage in time from 2013 to 2017, while also adding some data from prior years. GLODAPv2.2019 includes measurements from more than 1.1 million water samples from the global oceans collected on 840 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, especially 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 116 new cruises with the data from the 724 quality-controlled cruises of the GLODAPv2 data product. They correct for errors related to measurement, calibration, and data handling practices, taking into account any known or likely time trends or variations. 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, and 5 % in the halogenated transient tracers. The compilation also includes data for several other variables, such as isotopic tracers. These were not subjected to bias comparison or adjustments.

The original data, their documentation and DOI codes are available in the Ocean Carbon Data System of NOAA NCEI (https://www.nodc.noaa.gov/ocads/oceans/GLODAPv2_2019/, last access: 17 September 2019). 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 https://doi.org/10.25921/xnme-wr20 (Olsen et al., 2019). The product files also include significant ancillary and approximated data. These were obtained by interpolation of, or calculation from, measured data. This paper documents the GLODAPv2.2019 methods and provides a broad overview of the secondary quality control procedures and results.

Item Details

Item Type:Refereed Article
Keywords:Global Ocean Data Analysis Project, GLODAP, ocean biogeochemical data, GLODAPv2
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:137401
Year Published:2019
Web of Science® Times Cited:68
Deposited By:Directorate
Deposited On:2020-02-12
Last Modified:2020-08-26
Downloads:22 View Download Statistics

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