Spatial variations in euphotic zone nitrate utilization based on δ15N in surface sediments |
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| Authors: | M E Holmes P J Müller R R Schneider M Segl G Wefer |
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| Institution: | (1) Department of Geosciences, University of Bremen, Postfach 330440, 28334 Bremen, Germany, DE |
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| Abstract: | Bulk δ15N values in surface sediment samples off the southwestern coast of Africa were measured to investigate the biogeochemical
processes occurring in the water column. Nitrate concentrations and the degree of utilization of the nitrate pool are the
predominant controls on sedimentary δ15N in the Benguela Current region. Denitrification does not appear to have had an important effect on the δ15N signal of these sediments and, based on δ15N and δ13C, there is little terrestrial input.
Received: 9 May 1996 / Revision received: 27 May 1997 |
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