| Summary: | This data documentation discusses the procedures and methods used to measure total carbon dioxide (TCO2) and total alkalinity (TALK) at hydrographic stations, as well as the underway partial pressure of CO2 (pCO2) during the R/V Meteor Cruise 22/5 in the South Atlantic Ocean (Section A10). Conducted as part of the World Ocean Circulation Experiment (WOCE), the cruise began in Rio de Janeiro on December 27, 1992, and ended after 36 days at sea in Capetown, South Africa, on January 31, 1993. Measurements made along WOCE Section A10 included pressure, temperature, and salinity [measured by conductivity, temperature, and depth (CTD) sensor], bottle salinity, bottle oxygen, phosphate, nitrate, nitrite, silicate, chlorofluorocarbons (CFC-11, CFC-12), TCO2, TALK, and underway pCO2. The TCO2 was measured by using two Single-Operator Multiparameter Metabolic Analyzers (SOMMAs) for extracting CO2 from seawater samples that were coupled to a coulometer for detection of the extracted CO2. The overall precision and accuracy of the analyses was +/- 1.9 micro-mol/kg. Samples collected for TALK were measured by potentiometric titration; precision was +/- 2.0 micro-mol/kg. Underway pCO2 was measured by infrared photometry with a precision of +/- 2.0 micro-atm. The work aboard the R/V Meteor was supported by the U.S. Department of Energy under contract DE-ACO2-76CH00016, and the Bundesministerium f'r Forschung und Technologie through grants 03F0545A and MFG-099/1.
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