Olsen, Are , Lange, Nico, Key, Robert M., Tanhua, Toste , Álvarez, Marta , Becker, Susan, Bittig, Henry C. , Carter, Brendan R. , Cotrim da Cunha, Leticia, Feely, Richard A., van Heuven, Steven , Hoppema, Mario , Ishii, Masao, Jeansson, Emil, Jones, Steve D. , Jutterström, Sara, Karlsen, Maren K., Kozyr, Alex, Lauvset, Siv K., Lo Monaco, Claire, Murata, Akihiko , Pérez, Fiz F. , Pfeil, Benjamin, Schirnick, Carsten , Steinfeldt, Reiner , Suzuki, Toru, Telszewski, Maciej, Tilbrook, Bronte , Velo, Anton and Wanninkhof, Rik (2019) GLODAPv2.2019 – an update of GLODAPv2. Earth System Science Data, 11 (3). pp. 1437-1461. DOI 10.5194/essd-11-1437-2019.

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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.

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