Abstract
The 228Ra 226Ra activity ratios (henceforth denoted as [ 228 226 ] have been measured both at the surface and at 300 m depth as a function of distance from the Western Continental margins of India to the open Arabian Sea (between 15°N and 21°N). A two-dimensional eddy diffusion model is used to fit the measured [ 228 226 ] profiles to deduce horizontal eddy diffusivities in both zonal (towards open ocean) and meridional (towards the equator) directions. These range between 1.3 × 10 6 and 3.1 × 10 6 cm 2 s −1. Assuming that the organic-rich and deeply anoxic continental margin sediments at 300 m depth can be a source of organic C to the core of the denitrification layer and that the deficit flux in the carbon budget can be covered by this supply, the required gradient d C/ dZ in DOC content of waters from coast to open Arabian Sea is computed using the K x value. The required gradient is computed to be 4 μmol dm −3 100 km −1, which is within the error associated with DOC measurements.
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