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Jahnke, Richard A; Emerson, Steven R; Reimers, Clare; Schuffert, Jeffrey D; Ruttenberg, K; Archer, David E (1989): Chemistry of eastern tropical Atlantic porewater. PANGAEA, https://doi.org/10.1594/PANGAEA.730527, Supplement to: Jahnke, RA et al. (1989): Benthic recycling of biogenic debris in the eastern tropical Atlantic Ocean. Geochimica et Cosmochimica Acta, 53(11), 2947-2960, https://doi.org/10.1016/0016-7037(89)90171-3

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Abstract:
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.
Funding:
Fourth Framework Programme (FP4), grant/award no. MAS3970141: Silicon Cycling in the World Ocean
Coverage:
Median Latitude: 4.773141 * Median Longitude: -20.244601 * South-bound Latitude: -7.970000 * West-bound Longitude: -23.005000 * North-bound Latitude: 14.687980 * East-bound Longitude: -16.995000
Date/Time Start: 1989-11-01T00:00:00 * Date/Time End: 1989-11-01T00:00:00
Event(s):
1BC1-2 * Latitude: 14.667310 * Longitude: -17.834570 * Elevation: -1445.0 m * Method/Device: Box corer (BC)
1BC4-4 * Latitude: 14.671417 * Longitude: -17.833433 * Elevation: -1332.0 m * Method/Device: Box corer (BC)
2BC5-1 * Latitude: 14.687980 * Longitude: -19.965420 * Elevation: -1520.0 m * Method/Device: Box corer (BC)
Size:
21 datasets

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Datasets listed in this publication series

  1. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 1BC1-2. https://doi.org/10.1594/PANGAEA.140265
  2. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 1BC4-4. https://doi.org/10.1594/PANGAEA.140485
  3. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 2BC5-1. https://doi.org/10.1594/PANGAEA.140486
  4. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 4BC14-2. https://doi.org/10.1594/PANGAEA.140487
  5. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 4H10. https://doi.org/10.1594/PANGAEA.140489
  6. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 4IMP11. https://doi.org/10.1594/PANGAEA.140284
  7. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 6BC20-2. https://doi.org/10.1594/PANGAEA.140488
  8. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 6BCP24. https://doi.org/10.1594/PANGAEA.140285
  9. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 7BC25. https://doi.org/10.1594/PANGAEA.140277
  10. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 7BC26-1. https://doi.org/10.1594/PANGAEA.140276
  11. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 8BC27-3. https://doi.org/10.1594/PANGAEA.140266
  12. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 10BC35-2. https://doi.org/10.1594/PANGAEA.140267
  13. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 11.5BC46-2. https://doi.org/10.1594/PANGAEA.140269
  14. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 11BC39. https://doi.org/10.1594/PANGAEA.140268
  15. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 11H43. https://doi.org/10.1594/PANGAEA.140281
  16. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 12BC47-2. https://doi.org/10.1594/PANGAEA.140270
  17. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 12BC48-1. https://doi.org/10.1594/PANGAEA.140282
  18. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 12H50. https://doi.org/10.1594/PANGAEA.140283
  19. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 13BCP56. https://doi.org/10.1594/PANGAEA.140278
  20. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 14BC62. https://doi.org/10.1594/PANGAEA.140286
  21. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 15BC64. https://doi.org/10.1594/PANGAEA.140271