Chemistry of eastern tropical Atlantic porewater, supplement to: Jahnke, Richard A; Emerson, Steven R; Reimers, Clare; Schuffert, Jeffrey D; Ruttenberg, K; Archer, David E (1989): Benthic recycling of biogenic debris in the eastern tropical Atlantic Ocean. Geochimica et Cosmochimica Acta, 53(11), 2947-2960

Distributions of pore water O2, NO-2, NO-3, NH+4, Si(OH)4, PO[3-]4, Mn[2+], F-, and T.A. were determined at 15 stations in the eastern equatorial Atlantic. While overall profile characteristics are consistent with previous models of organic matter diagenesis, profile shapes suggest that a deep react...

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Bibliographic Details
Main Authors: Jahnke, Richard A, Emerson, Steven R, Reimers, Clare, Schuffert, Jeffrey D, Ruttenberg, K, Archer, David E
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 1989
Subjects:
Box corer
Punch core
In situ oxygen microprofiler
Box corer with microelectrode
Silicon Cycling in the World Ocean SINOPS
Archer
Emerson
Pacific
North Atlantic
Online Access:https://dx.doi.org/10.1594/pangaea.730527
https://doi.pangaea.de/10.1594/PANGAEA.730527
Description
Summary:Distributions of pore water O2, NO-2, NO-3, NH+4, Si(OH)4, PO[3-]4, Mn[2+], F-, and T.A. were determined at 15 stations in the eastern equatorial Atlantic. While overall profile characteristics are consistent with previous models of organic matter diagenesis, profile shapes suggest that a deep reaction layer, rich in organic C, is also present at many sites. While it is unlikely that the oxidation of organic C in this layer has had a major effect on the ocean C cycle, pore water profile shapes are significantly altered. Despite exposure to seawater SO[2-]4 concentrations for > 1000 years, decomposition of the organic matter in the layer appears to be restricted to oxic and suboxic processes. These results suggest major differences in organic carbon decomposition and preservation under oxic/suboxic and anoxic conditions.Present-day benthic fluxes are largest adjacent to the eastern boundary coastal upwelling region and similar in magnitude to values reported for the eastern Pacific. Preliminary estimates suggest that the benthic respiration in the eastern 1/3 of the North Atlantic south of 20°N may alone account for >20% of the total deep North Atlantic respiration. Combining these results with estimates of organic C burial and deep water-column decomposition suggests that this region is a major location of organic C input into the deep sea.

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