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Water column data of carbon and carbon-relevant hydrographic and hydrochemical parameters from 188 cruises in the Arctic Mediterranean Seas, Atlantic and Southern Ocean have been retrieved and merged in a new data base: the CARINA (CARbon IN the Atlantic) Project. These data have gone through rigorous quality control (QC) procedures so as to improve the quality and consistency of the data as much as possible. Secondary quality control, which involved objective study of data in order to quantify systematic differences in the reported values, was performed for the pertinent parameters in the CARINA data base. Systematic biases in the data have been tentatively corrected in the data products. The products are three merged data files with measured, adjusted and interpolated data of all cruises for each of the three CARINA regions (Arctic Mediterranean Seas, Atlantic and Southern Ocean). Ninety-eight cruises were conducted in the "Atlantic" defined as the region south of the Greenland-Iceland-Scotland Ridge and north of about 30° S. Here we report the details of the secondary QC which was done on the total dissolved inorganic carbon (TCO₂) data and the adjustments that were applied to yield the final data product in the Atlantic. Procedures of quality control – including crossover analysis between stations and inversion analysis of all crossover data – are briefly described. Adjustments were applied to TCO₂ measurements for 17 of the cruises in the Atlantic Ocean region. With these adjustments, the CARINA data base is consistent both internally as well as with GLODAP data, an oceanographic data set based on the WOCE Hydrographic Program in the 1990s, and is now suitable for accurate assessments of, for example, regional oceanic carbon inventories, uptake rates and model validation

This data documentation discusses the procedures and methods used to measure total carbon dioxide (TCO~, total alkahity (TALK), and radiocarbon (A 14C),at hydrographic stations, as well as the underway partial pressure of C02 (pCOz) during the R/V Thomas G. Thompson oceanographic cruise in the Pacific Ocean (Section P1O). Conducted as part of the World Ocean Circulation Experiment (WOCE), the cruise began in SUVZZ Fiji, on October 5, 1993, and ended in Yokoh~Japan, on November 10, 1993. Measurements made along WOCE Section P1O included pressure, temperature, salinity [measured by conductivity, temperature, and depth sensor (CTD)], bottle salinity, bottle oxygen, phosphate, nitrate, nitrite, silicate, chlorofluorocarbons (CFC-1 1, CFC-12), TCOZ, TALK A 14C,and underway pCOz The TCOZwas measured by coulometry using a Single-Operator Multiparameter Metabolic Analyzer (SOMMA). The overall precision and accuracy of the analyses was pmolkg. Samples collected for TALK were measured by potentiometric titratio~precision was *4 pmol/kg. Small volume samples collected for 14Cwere sent to shore and measured by use of an accelerator mass spectrometry technique. Underway XC02 was measured by infia.red photomehy with a precision of *1 patm. The COz-related measurements aboard the RN Thomas G. Thompson were supported by the U.S. Department of Energy. P1O is the western most section of the U.S. WOCE survey of the North Pacific Ocean. It is important for understanding the dynamics of the far western equatorial Pacific. The results from this cruise can be used to infer the relative rna=titude of various tracers to the North Pacii3c from the South China Sea and the Sea of Japan. WOCE Section P1O also provides a transect across the Kuroshio Current that can be used to better understand the northward transport of hea~sal~and other important ocean tracers. The underway surface measurements show a small outgassing of COZ at the equator. The TCOZ, TALK and radiocarbon values show profiles typical for the North Pacific. TALK correlates strongly with salinity. 14Ccomelates strongly with silicate. Deflection of the isolines of all parameters at the northern end of the cruise results from the Kuroshio Current. The WOCE Section P1O data set is available free of charge as a numeric data package (NDP) from the Carbon Dioxide Information Analysis Center. The NDP consists of four oceanographic data files, four FORTIU.N 90 data-retrieval routine fdes, a documentation file, and thk printed report, which describes the contents and format of all fdes as well as the procedures and methods used to obtain the data. Instructions on how to access the data are provided.

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