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Ragueneau, Olivier; Gallinari, Morgane; Corrin, Lydie; Grandel, Sibylle; Hall, Per; Hauvespre, Anne; Lampitt, Richard Stephen; Rickert, Dirk; Ståhl, Henrik; Tengberg, Anders; Witbaard, Rob (2001): Biogenic silica and silicic acid benthic fluxes of a North-eastern Atlantic Abyssal Locality. PANGAEA, https://doi.org/10.1594/PANGAEA.722835, Supplement to: Ragueneau, O et al. (2001): The benthic silica cycle in the Northeast Atlantic: annual mass balance, seasonality, and importance of non-steady-state processes for the early diagenesis of biogenic opal in deep-sea sediments. Progress in Oceanography, 50(1-4), 171-200, https://doi.org/10.1016/S0079-6611(01)00053-2

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Abstract:
Within the framework of the EU-funded BENGAL programme, the effects of seasonality on biogenic silica early diagenesis have been studied at the Porcupine Abyssal Plain (PAP), an abyssal locality located in the northeast Atlantic Ocean. Nine cruises were carried out between August 1996 and August 1998. Silicic acid (DSi) increased downward from 46.2 to 213 µM (mean of 27 profiles). Biogenic silica (BSi) decreased from ca. 2% near the sediment-water interface to <1% at depth. Benthic silicic acid fluxes as measured from benthic chambers were close to those estimated from non-linear DSi porewater gradients. Some 90% of the dissolution occurred within the top 5.5 cm of the sediment column, rather than at the sediment-water interface and the annual DSi efflux was close to 0.057 mol Si/m**2/yr. Biogenic silica accumulation was close to 0.008 mol Si/m**2/yr and the annual opal delivery reconstructed from sedimentary fluxes, assuming steady state, was 0.065 mol Si/m**2/yr. This is in good agreement with the mean annual opal flux determined from sediment trap samples, averaged over the last decade (0.062 mol Si/m**2/yr). Thus ca. 12% of the opal flux delivered to the seafloor get preserved in the sediments. A simple comparison between the sedimentation rate and the dissolution rate in the uppermost 5.5 cm of the sediment column suggests that there should be no accumulation of opal in PAP sediments. However, by combining the BENGAL high sampling frequency with our experimental results on BSi dissolution, we conclude that non-steady state processes associated with the seasonal deposition of fresh biogenic particles may well play a fundamental role in the preservation of BSi in these sediments. This comes about though the way seasonal variability affects the quality of the biogenic matter reaching the seafloor. Hence it influences the intrinsic dissolution properties of the opal at the seafloor and also the part played by non-local mixing events by ensuring the rapid transport of BSi particles deep into the sediment to where saturation is reached.
Coverage:
Median Latitude: 48.849870 * Median Longitude: -16.503048 * South-bound Latitude: 47.601000 * West-bound Longitude: -19.859000 * North-bound Latitude: 48.992300 * East-bound Longitude: -16.271000
Date/Time Start: 1996-08-14T16:50:00 * Date/Time End: 1998-08-30T22:47:00
Event(s):
12925-008 * Latitude Start: 47.601200 * Longitude Start: -19.859000 * Latitude End: 47.601000 * Longitude End: -19.859000 * Date/Time Start: 1996-08-14T16:50:00 * Date/Time End: 1996-08-16T14:29:00 * Elevation: -4529.0 m * Campaign: D222/1 * Basis: Discovery (1962) * Method/Device: Göteborg lander (GBGL) * Comment: OMEX Site
12926-002 * Latitude Start: 48.833000 * Longitude Start: -16.271000 * Latitude End: 48.833000 * Longitude End: -16.271000 * Date/Time Start: 1996-08-17T17:06:00 * Date/Time End: 1996-08-20T10:56:00 * Elevation: -4802.0 m * Campaign: D222/1 * Basis: Discovery (1962) * Method/Device: Göteborg lander (GBGL) * Comment: All four chambers worked perfectly.
12930-040 * Latitude Start: 48.833000 * Longitude Start: -16.295000 * Latitude End: 48.830002 * Longitude End: -16.299000 * Date/Time Start: 1996-09-07T14:00:00 * Date/Time End: 1996-09-10T07:13:00 * Elevation: -4840.0 m * Campaign: D222/2 * Basis: Discovery (1962) * Method/Device: MultiCorer Barnett pattern (12-57) (MCB57) * Comment: ETA bottom 1200. Recovered 10/09 (07:13).
Size:
33 datasets

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Datasets listed in this publication series

  1. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): (Table 2) Silicic acid flux measured on landers. https://doi.org/10.1594/PANGAEA.58607
  2. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 12930-082. https://doi.org/10.1594/PANGAEA.58636
  3. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 12930-087. https://doi.org/10.1594/PANGAEA.722502
  4. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 13077-018. https://doi.org/10.1594/PANGAEA.722503
  5. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 13077-021. https://doi.org/10.1594/PANGAEA.722504
  6. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 13077-057. https://doi.org/10.1594/PANGAEA.722505
  7. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 13200-012. https://doi.org/10.1594/PANGAEA.722506
  8. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 13200-024. https://doi.org/10.1594/PANGAEA.722507
  9. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 13200-032. https://doi.org/10.1594/PANGAEA.722508
  10. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 54301-002. https://doi.org/10.1594/PANGAEA.722509
  11. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 54301-010. https://doi.org/10.1594/PANGAEA.722510
  12. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Biogenic silica content of sediment core 54301-023. https://doi.org/10.1594/PANGAEA.722511
  13. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 12930-040. https://doi.org/10.1594/PANGAEA.722512
  14. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 12930-045. https://doi.org/10.1594/PANGAEA.722513
  15. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 12930-075. https://doi.org/10.1594/PANGAEA.722514
  16. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 12930-087. https://doi.org/10.1594/PANGAEA.722515
  17. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 13077-018. https://doi.org/10.1594/PANGAEA.722516
  18. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 13077-021. https://doi.org/10.1594/PANGAEA.722517
  19. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 13077-057. https://doi.org/10.1594/PANGAEA.722518
  20. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 13200-024. https://doi.org/10.1594/PANGAEA.722519
  21. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 13200-032. https://doi.org/10.1594/PANGAEA.722520
  22. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 13201-005. https://doi.org/10.1594/PANGAEA.722521
  23. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core 13368-040. https://doi.org/10.1594/PANGAEA.722522
  24. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core DI236_11-1. https://doi.org/10.1594/PANGAEA.722523
  25. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M36/6_MC33. https://doi.org/10.1594/PANGAEA.722524
  26. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M42/2_367, chamber 2. https://doi.org/10.1594/PANGAEA.722535
  27. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M42/2_MC2. https://doi.org/10.1594/PANGAEA.722527
  28. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M42/2_MC28. https://doi.org/10.1594/PANGAEA.722528
  29. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M42/2_MC30. https://doi.org/10.1594/PANGAEA.722529
  30. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M42/2_MC32. https://doi.org/10.1594/PANGAEA.722530
  31. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M42/2_MC34. https://doi.org/10.1594/PANGAEA.722531
  32. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M42/2_MC5. https://doi.org/10.1594/PANGAEA.58640
  33. Ragueneau, O; Gallinari, M; Corrin, L et al. (2001): Silicic acid concentration of sediment core M42/2_MC9. https://doi.org/10.1594/PANGAEA.722534