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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.
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):
10BC35-2 * Latitude: 2.132500 * Longitude: -19.664850 * Date/Time: 1989-11-01T00:00:00 * Elevation: -5036.0 m * Method/Device: Box corer (BC)
11.5BC46-2 * Latitude: 0.936570 * Longitude: -22.893070 * Date/Time: 1989-11-01T00:00:00 * Elevation: -4419.0 m * Method/Device: Box corer (BC)
11BC39 * Latitude: 1.954850 * Longitude: -22.783050 * Date/Time: 1989-11-01T00:00:00 * Elevation: -4210.0 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 10BC35-2. https://doi.org/10.1594/PANGAEA.140267
  2. 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
  3. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 11BC39. https://doi.org/10.1594/PANGAEA.140268
  4. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 11H43. https://doi.org/10.1594/PANGAEA.140281
  5. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 12BC47-2. https://doi.org/10.1594/PANGAEA.140270
  6. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 12BC48-1. https://doi.org/10.1594/PANGAEA.140282
  7. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 12H50. https://doi.org/10.1594/PANGAEA.140283
  8. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 1BC1-2. https://doi.org/10.1594/PANGAEA.140265
  9. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 1BC4-4. https://doi.org/10.1594/PANGAEA.140485
  10. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 2BC5-1. https://doi.org/10.1594/PANGAEA.140486
  11. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 4BC14-2. https://doi.org/10.1594/PANGAEA.140487
  12. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 4H10. https://doi.org/10.1594/PANGAEA.140489
  13. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 6BC20-2. https://doi.org/10.1594/PANGAEA.140488
  14. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 7BC26-1. https://doi.org/10.1594/PANGAEA.140276
  15. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Nutrients in porewater of sediment profile 8BC27-3. https://doi.org/10.1594/PANGAEA.140266
  16. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 13BCP56. https://doi.org/10.1594/PANGAEA.140278
  17. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 14BC62. https://doi.org/10.1594/PANGAEA.140286
  18. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 15BC64. https://doi.org/10.1594/PANGAEA.140271
  19. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 4IMP11. https://doi.org/10.1594/PANGAEA.140284
  20. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 6BCP24. https://doi.org/10.1594/PANGAEA.140285
  21. Jahnke, RA; Emerson, SR; Reimers, C et al. (1989): Oxygen in porewater of sediment profile 7BC25. https://doi.org/10.1594/PANGAEA.140277