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• W4308706979 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> 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. GLODAPv2.2022 is an update of the previous version, GLODAPv2.2021 (Lauvset et al., 2021). The major changes are as follows: data from 96 new cruises were added, data coverage was extended until 2021, and for the first time we performed secondary quality control on all sulfur hexafluoride (SF<span class=inline-formula>₆</span>) data. In addition, a number of changes were made to data included in GLODAPv2.2021. These changes affect specifically the SF<span class=inline-formula>₆</span> data, which are now subjected to secondary quality control, and carbon data measured on board the RV <i>Knorr</i> in the Indian Ocean in 1994–1995 which are now adjusted using certified reference material (CRM) measurements made at the time. GLODAPv2.2022 includes measurements from almost 1.4 million water samples from the global oceans collected on 1085 cruises. The data for the now 13 GLODAP core variables (salinity, oxygen, nitrate, silicate, phosphate, dissolved inorganic carbon, total alkalinity, pH, chlorofluorocarbon-11 (CFC-11), CFC-12, CFC-113, CCl<span class=inline-formula>₄</span>, and SF<span class=inline-formula>₆</span>) 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 converted to World Ocean Circulation Experiment (WOCE) exchange format and (ii) as a merged data product with adjustments applied to minimize bias. For the present annual update, adjustments for the 96 new cruises were derived by comparing those data with the data from the 989 quality-controlled cruises in the GLODAPv2.2021 data product using crossover analysis. SF<span class=inline-formula>₆</span> data from all cruises were evaluated by comparison with CFC-12 data measured on the same cruises. For nutrients and ocean carbon dioxide (CO<span class=inline-formula>₂</span>) chemistry comparisons to estimates based on empirical algorithms provided additional context for adjustment decisions. The adjustments that we applied 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 <span class=inline-formula>µmol</span> kg<span class=inline-formula>^−1</span> in dissolved inorganic carbon, 4 <span class=inline-formula>µmol</span> kg<span class=inline-formula>^−1</span> 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 CO<span class=inline-formula>₂</span> fugacity (<span class=inline-formula><i>f</i></span>CO<span class=inline-formula>₂</span>), were not subjected to bias comparison or adjustments. The original data, their documentation, and DOI codes are available at the Ocean Carbon and Acidification Data System of NOAA NCEI (<span class=uri>https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/GLODAPv2_2022/</span>, last access: 15 August 2022). 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 <a href=https://doi.org/10.25921/1f4w-0t92>https://doi.org/10.25921/1f4w-0t92</a> (Lauvset et al., 2022). These bias-adjusted product files also include significant ancillary and approximated data, which were obtained by interpolation of, or calculation from, measured data. This living data update documents the GLODAPv2.2022 methods and provides a broad overview of the secondary quality control procedures and results." @default.
• W4308706979 created "2022-11-14" @default.
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• W4308706979 date "2022-11-10" @default.
• W4308706979 modified "2023-09-30" @default.
• W4308706979 title "Reply on RC1" @default.
• W4308706979 doi "https://doi.org/10.5194/essd-2022-293-ac1" @default.
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