Anthropogenic CO2 inventory of the Indian Ocean

C. L. Sabine, R. M. Key, K. M. Johnson, Frank J Millero, A. Poisson, J. L. Sarmiento, D. W R Wallace, C. D. Winn

Research output: Contribution to journalArticle

164 Citations (Scopus)

Abstract

This study presents basin-wide anthropogenic CO2 inventory estimates for the Indian Ocean based on measurements from the World Ocean Circulation Experiment/Joint Global Ocean Flux Study global survey. These estimates employed slightly modified ΔC* and time series techniques originally proposed by Gruber et al. [1996] and Wallace [1995], respectively. Together, the two methods yield the total oceanic anthropogenic CO2 and the carbon increase over the past 2 decades. The highest concentrations and the deepest penetrations of anthropogenic carbon are associated with the Subtropical Convergence at around 30°to 40°S. With both techniques, the lowest anthropogenic CO2 column inventories are observed south of 50°S. The total anthropogenic CO2 inventory north of 35°S was 13.6±2 Pg C in 1995. The inventory increase since GEOSECS (Geochemical Ocean Sections Program) was 4.1±1 Pg C for the same area. Approximately 6.7±1 Pg C are stored in the Indian sector of the Southern Ocean, giving a total Indian Ocean inventory of 20.3±3 Pg C for 1995. These estimates are compared to anthropogenic CO2 inventories estimated by the Princeton ocean biogeochemistry model. The model predicts an Indian Ocean sink north of 35°S that is only 0.61-0.68 times the results presented here; while the Southern Ocean sink is nearly 2.6 times higher than the measurement-based estimate. These results clearly identify areas in the models that need further examination and provide a good baseline for future studies of the anthropogenic inventory.

Original languageEnglish (US)
Pages (from-to)179-198
Number of pages20
JournalGlobal Biogeochemical Cycles
Volume13
Issue number1
DOIs
StatePublished - Mar 1999

Fingerprint

Carbon
Biogeochemistry
ocean
Time series
Fluxes
subtropical convergence
carbon
biogeochemistry
global ocean
Indian Ocean
Experiments
penetration
time series
basin
experiment

ASJC Scopus subject areas

  • Atmospheric Science
  • Environmental Science(all)
  • Environmental Chemistry
  • Global and Planetary Change

Cite this

Sabine, C. L., Key, R. M., Johnson, K. M., Millero, F. J., Poisson, A., Sarmiento, J. L., ... Winn, C. D. (1999). Anthropogenic CO2 inventory of the Indian Ocean. Global Biogeochemical Cycles, 13(1), 179-198. https://doi.org/10.1029/1998GB900022

Anthropogenic CO2 inventory of the Indian Ocean. / Sabine, C. L.; Key, R. M.; Johnson, K. M.; Millero, Frank J; Poisson, A.; Sarmiento, J. L.; Wallace, D. W R; Winn, C. D.

In: Global Biogeochemical Cycles, Vol. 13, No. 1, 03.1999, p. 179-198.

Research output: Contribution to journalArticle

Sabine, CL, Key, RM, Johnson, KM, Millero, FJ, Poisson, A, Sarmiento, JL, Wallace, DWR & Winn, CD 1999, 'Anthropogenic CO2 inventory of the Indian Ocean', Global Biogeochemical Cycles, vol. 13, no. 1, pp. 179-198. https://doi.org/10.1029/1998GB900022
Sabine CL, Key RM, Johnson KM, Millero FJ, Poisson A, Sarmiento JL et al. Anthropogenic CO2 inventory of the Indian Ocean. Global Biogeochemical Cycles. 1999 Mar;13(1):179-198. https://doi.org/10.1029/1998GB900022
Sabine, C. L. ; Key, R. M. ; Johnson, K. M. ; Millero, Frank J ; Poisson, A. ; Sarmiento, J. L. ; Wallace, D. W R ; Winn, C. D. / Anthropogenic CO2 inventory of the Indian Ocean. In: Global Biogeochemical Cycles. 1999 ; Vol. 13, No. 1. pp. 179-198.
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