Carbon dioxide, hydrographic, and chemical data obtained in the Central South Pacific Ocean (WOCE sections P17S and P16S) during the tunes-2-expedition of the R/V Thomas Washington, July--August 1991

摘要

This data documentation discusses the procedures and methods used to measure total carbon dioxide (TCO(sub 2)), discrete partial pressure of TCO(sub 2) (pCO(sub 2)), and total alkalinity (TALK), during the Research Vessel (R/V) Thomas Washington TUNES Leg 2 Expedition in the central South Pacific Ocean. Conducted as part of the World Ocean Circulation Experiment (WOCE), the cruise began in Papeete, Tahiti, French Polynesia, on July 16, 1991, and returned to Papeete on August 25, 1991. WOCE Meridional Sections P17S along 135(degrees) W and P16S along 150(degrees) W were completed during the 40-day expedition. A total of 97 hydrographic stations were occupied. Hydrographic and chemical measurements made along WOCE Sections P17S and P16S included pressure, temperature, salinity, and oxygen measured by conductivity, temperature and depth sensor; bottle salinity; oxygen; phosphate; nitrate; nitrite; silicate; CFC-12; CFC- 11; TCO(sub 2); TALK; and pCO(sub 2) measured at 20(degrees)C. The TCO(sub 2) concentration in 1000 seawater samples was determined with a coulometric analysis system, the pCO(sub 2) in 940 water samples was determined with an equilibrator/gas chromatograph system, while the TALK concentration in 139 samples was determined on shore at the laboratory of C. Goyet of Woods Hole Oceanographic Institution with an alkalinity titration system. In addition, 156 coulometric measurements for the Certified Reference Material (Batch (number sign)6) were made and yielded a mean value of 2303.2 (plus minus) 1.5 (mu)mol/kg. This mean value agrees within a standard deviation of the 2304.6 (plus minus) 1.6 (mu)mol/kg (N=9) value determined with the manometer of C. D. Keeling at Scripps Institution of Oceanography (SIO). Replicate samples from 11 Niskin bottles at 4 stations were also collected for later shore-based reference analyses of TCO(sub 2) and TALK by vacuum extraction and manometry in the laboratory of C. D. Keeling of SIO.