Abyssal upwelling in the Indian Ocean: Radiocarbon diagnostics

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ID: 308723
2000
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Abstract
The GEOSECS Indian Ocean radiocarbon and carbonate chemistry data set are used to estimate the mean upwelling transport of bottom water in the Indian Ocean north of 30S. The study uses an ‘ ‘ adjusted radiocarbon concentration’ ’ which is corrected for the effects of addition of particulate radiocarbon to the deep ocean. The cross-basin uniformity in the vertical gradients of ‘ ‘ adjusted radiocarbon’ ’ allows quantie cation of vertical transfer processes using horizontally averaged concentration and e uxes. The estimated total upwelling e ux, north of 30S, is 8.2 6 1.5 3 10 6 m 3 s 2 1 . The mean upwelling velocity and the vertical diffusivity, in the 3000‐ 4500 m depth range, are estimated as 3 3 10 6 m s 2 1 and 2.53 10 2 4 m 2 s 2 1 , respectively. The results also suggest faster upwelling in the western Indian Ocean.
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Authors Ashwanth Srinivasan, Claes Rooth, Zafer Top, Donald B. Olson
Journal journal of marine research
Year 2000
DOI
10.1357/002224000321358891
URL
https://doi.org/10.1357/002224000321358891
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