GLODAP

The Indian Ocean Database Synthesis

The Indian Ocean database consists primarily of all the U.S. WOCE and NOAA cruises. Carbon measurements were made as part of the JGOFS Global Survey funded through DOE. Details of the WOCE/JGOFS Indian Ocean CO₂ measurement program—including personnel, sampling and measurement protocols, and data quality assurance/quality control checks—are provided in Johnson et al. 1998, Millero et al. 1998, and Johnson et al. 2002 (ORNL/CDIAC-138, NDP-080).

We have also included the data from the French INDIGO and CIVA1 cruises (contributed by A. Poisson). A summary of the combined data set can be found in Sabine et al. 1999. Table 1 is the individual Indian Ocean cruise and personnel summary.

The WOCE/DOE and CIVA TCO₂ data have an estimated accuracy of ±2 µmol/kg. Proposed adjustments for the INDIGO I, II, and III TCO₂ data to bring them in line with the WOCE/DOE data are +10.7, -9.4, and +6.4 µmol/kg, respectively. The WOCE/DOE and CIVA alkalinity data have an estimated accuracy of ±3 µmol/kg. Proposed adjustments for the INDIGO I and II alkalinity data to bring them in line with the WOCE/DOE data are +6.5 and +6.8 µmol/kg, respectively. These results have been published in Sabine et al. 1999. As part of this work we also evaluated the quality of GEOSECS carbon data. Our study indicates that the GEOSECS TCO₂ values are 22.6 µmol/kg high relative to the WOCE/DOE data in the deep Indian Ocean. No adjustmen was proposed for the GEOSECS alkalinity data. Detailed information on the Indian Ocean correction factors given in Table 2.

Johnson, K.M., A.G. Dickson, G. Eischeid, C. Goyet, P. Guenther, R.M. Key, F.J. Millero, D. Purkerson, C.L. Sabine, R.G. Schottle, D.R.W. Wallace, R.J. Wilke and C.D. Winn, Coulometric total carbon dioxide analysis for marine studies: Assessment of the quality of total inorganic carbon measurements made during the US Indian Ocean CO₂ Survey 1994-1996, Marine Chemistry, 63, 21-37, 1998.

Millero, F.J., A.G. Dickson, G. Eischeid, C. Goyet, P. Guenther, K.M. Johnson, K. Lee, D. Purkerson, C.L. Sabine, R.M. Key, R.G. Schottle, D.R.W. Wallace, R.J. Wilke and C.D. Winn, Total alkalinity measurements in the Indian Ocean during the WOCE Hydrographic Program CO₂ survey cruises 1994-1996, Marine Chemistry, 63, 9-20, 1998.

Sabine, C.L., R.M. Key, K.M. Johnson, F.J. Millero, A. Poisson, J.L. Sarmiento, D.W.R. Wallace and C.D. Winn, Anthropogenic CO₂ inventory of the Indian Ocean, Global Biogeochemical Cycles, 13, 179-198, 1999.

Table 1 gives details about the Indian Ocean Cruise Summary.

Table 1

Table 2 gives detailed information about Indian Ocean Correction Factors

Table 2

As a check on the internal consistency and accuracy of the data we have examined the values in areas where two cruises intersect

Crossover Study

We have provided a summary of the crossover results along with a list of recommended adjustments for an internally consistent database
Summary


	Ocean Home • Comments • Contact Us • CDIAC • ESD • ORNL • Disclaimers This site provided by the Oak Ridge National Laboratory ORNL is managed by UT-Battelle LLC. for the U.S. Department of Energy