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Paytan, Adina; Kaster, M (1996): Barium concentration in sediments of the central Equatorial Pacific. PANGAEA, https://doi.org/10.1594/PANGAEA.736799, Supplement to: Paytan, A; Kaster, M (1996): Benthic Ba fluxes in the central Equatorial Pacific, implications for the ocean Ba cycle. Earth and Planetary Science Letters, 142(3-4), 439-450, https://doi.org/10.1016/0012-821X(96)00120-3

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Abstract:
High resolution pore-water dissolved Ba concentration-depth profiles were determined at seven sites across an Equatorial Pacific productivity gradient from 12°S to 9°N, at 140°W. These data are important for understanding the physical, chemical, and biological controls on Ba recycling in the ocean, and for evaluating the paleo-oceanographic significance of Ba content in central Equatorial Pacific sediments.
Pore-water Ba concentrations at all sites are higher than in the overlying bottom water, leading to a diffusive flux of Ba into the ocean. A pronounced subsurface concentration maximum exceeding barite solubility characterizes the dissolved Ba pore-water profiles, suggesting that the Ba regenerated in the upper few millimeters of sediment is not controlled by barite solubility. A few centimeters down-core Ba concentrations reach a relatively constant value of approximately barite saturation.
The benthic Ba flux shows a clear zonal trend, with a maximum between 2°S and 2°N, most probably due to higher productivity at the equatorial divergence zone, and with lowest values at the southern and northern extremes of the transect. The dissolved Ba flux between 2°S and 2°N is ~30 nmol/cm**2 yr and drops to 6 nmol/cm**2 yr at 12°S. Even the lowest fluxes are significantly higher than those previously reported for the open ocean. In the Equatorial Pacific the calculated Ba recycling efficiency is about 70%. Thus, ~30% of the particulate Ba flux to the deep ocean is preserved in the sediments, compared with less than 1% for organic carbon and ~5% for biogenic silica.
Mass balance calculation of the oceanic Ba cycle, using a two-box model, implies benthic Ba fluxes similar to those reported here for a steady-state ocean.
Related to:
Paytan, Adina (2003): Barium concentrations in sediment core pore water. United States JGOFS Process Study Data 1989-1998; CD-ROM volume 1, version 2, Woods Hole Oceanographic Institution, USA: U.S. JGOFS Data Management Office
Project(s):
Coverage:
Median Latitude: -0.428571 * Median Longitude: -140.000000 * South-bound Latitude: -12.000000 * West-bound Longitude: -140.000000 * North-bound Latitude: 9.000000 * East-bound Longitude: -140.000000
Event(s):
TT013_12S_A * Latitude: -12.000000 * Longitude: -140.000000 * Location: Equatorial Pacific * Campaign: TT013 * Basis: Thomas G. Thompson * Method/Device: Gravity corer (GC)
TT013_12S_B * Latitude: -12.000000 * Longitude: -140.000000 * Location: Equatorial Pacific * Campaign: TT013 * Basis: Thomas G. Thompson * Method/Device: Gravity corer (GC)
TT013_2N_A * Latitude: 2.000000 * Longitude: -140.000000 * Location: Equatorial Pacific * Campaign: TT013 * Basis: Thomas G. Thompson * Method/Device: Gravity corer (GC)
Size:
14 datasets

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Datasets listed in this publication series

  1. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_12S_A. https://doi.org/10.1594/PANGAEA.124944
  2. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_12S_B. https://doi.org/10.1594/PANGAEA.124945
  3. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_2N_A. https://doi.org/10.1594/PANGAEA.124946
  4. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_2N_B. https://doi.org/10.1594/PANGAEA.124947
  5. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_2S_A. https://doi.org/10.1594/PANGAEA.124948
  6. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_2S_B. https://doi.org/10.1594/PANGAEA.124949
  7. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_5N_A. https://doi.org/10.1594/PANGAEA.124950
  8. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_5N_B. https://doi.org/10.1594/PANGAEA.124951
  9. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_5S_A. https://doi.org/10.1594/PANGAEA.124952
  10. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_5S_B. https://doi.org/10.1594/PANGAEA.124953
  11. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_9N_A. https://doi.org/10.1594/PANGAEA.124954
  12. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_9N_B. https://doi.org/10.1594/PANGAEA.124955
  13. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_EQ_A. https://doi.org/10.1594/PANGAEA.124956
  14. Paytan, A; Kaster, M (1996): Barium concentration in pore water of sediment core TT013_EQ_B. https://doi.org/10.1594/PANGAEA.124957