Abstract

Indian Ocean Deep waters (IDW) show an increase in salinity and ΣCO2 between 64°S and 16±4°N by 0.106–0.110‰ and 82–104 µM kg−1 respectively with a corresponding decrease in Δ14C by 42‰ as revealed by the GEOSECS data (1977–78). The Δ14C‐ΣCO2‐Salinity relationships show better correlation in the western sector. High biological productivity induced changes and corrosive deepwaters could account for ΣCO2 increase in the northern regions. Reoccupation of GEOSECS stations during 1985–95 do not show distinctly discernible short‐term temporal changes in Δ14C, ΣCO2 and salinity.

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