Particulate aluminium fluxes in the eastern Atlantic |
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Authors: | R Chester |
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Institution: | Department of Oceanography, The University, Liverpool L69 3BX Gt. Britain |
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Abstract: | The atmospheric, primary down-column and sedimentary fluxes of particulate aluminium (Alp) have been calculated for a number of regions in the Atlantic Ocean.The vertical down-column flux of Alp from Atlantic surface waters exhibits a strong geographical variation, and its magnitude is influenced by supply mechanisms, which control the surface Alp concentrations, and primary production, which affects the rate of down-column transport. Overall, the down-column transport of Alp is greatest in the marginal regions of the Atlantic. In the eastern margins the highest surface water concentrations are found in the region lying between ~30°N and ~10°N, i.e. under the general path of the northeast trades. In this region there is excellent agreement between the dry (i.e. 1 cm?1 s?1 deposition velocity) atmospheric flux (~80 000 ng Alp cm?2 y?1), the primary vertical down-column flux () and the sediment flux (~90 000 ng Alp cm?2 y?1). In the regions to the north (i.e. ~40°N to ~30°N) and to the south (i.e. ~10°N to ~5°S) the primary down-column Alp flux decreases to an average of ~19 000 μg cm?2 y?1, which makes a direct maximum contribution of ~20% of the sediment Alp requirement. In the open-ocean South Atlantic the primary down-column flux of Alp is ~3300 μg cm?2 y?1, this is similar to the dry (i.e. 1 cm?1 s?1 deposition velocity) atmospheric flux, and contributes ~20% of the Alp required by the underlying deep-sea sediment. |
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