Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Meteor Cruise 22/5 in the South Atlantic Ocean (WOCE Section A10, December 1992-January 1993)
Johnson, Kenneth M., Brookhaven National Laboratory, Upton, New York; Bernd Schneider, Baltic Sea Research Institute, Warnemünde, Germany; Ludger Mintrop, Institute for Marine Sciences, Kiel, Germany; and Douglas W. R. Wallace, Brookhaven National Laboratory, Upton, New York
Prepared by Alexander Kozyr, CDIAC
NDP-066 (1998) (http://cdiac.ornl.gov/oceans/ndp_066/ndp066.html)
Procedures and methods that were 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) are presented in this data package. 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. Knowledge of these parameters and their initial conditions will enable researchers to determine heat and water transport as well as carbon transport. Anunderstanding of this transport will contribute to the understanding of processes that are relevant to climate change. This section in the South Atlantic subtropical gyre is especially relevant to understanding CO2 transport because it crosses both the Brazil and the Benguela boundary currents.
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 µmol/kg. Samples collected for TALK were measured by potentiometric titration; precision was ±2.0 µmol/kg. Underway pCO2 was measured by infrared photometry with a precision of ±2.0 µatm. The work aboard the R/V Meteor was supported by the U.S. Department of Energy and the Bundesministerium für Forschung und Technologie. WDC-A database
