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Martin, William R; Bender, Michael L; Leinen, Margaret W; Orchardo, J (1991): Nutrients of pore water in sediments of the central equatorial Pacific. PANGAEA, https://doi.org/10.1594/PANGAEA.735139, Supplement to: Martin, WR et al. (1991): Benthic organic carbon degradation and biogenic silica dissolution in the central equatorial Pacific. Deep-Sea Research Part A. Oceanographic Research Papers, 38(12), 1481-1516, https://doi.org/10.1016/0198-0149(91)90086-U

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Abstract:
Shipboard whole-core squeezing was used to measure pore water concentration vs depth profiles of [NO3]-, O2 and SiO2 at 12 stations in the equatorial Pacific along a transect from 15°S to 11°N at 135°W. The [NO3]- and SiO2 profiles were combined with fine-scale resistivity and porosity measurements to calculate benthic fluxes. After using O2 profiles, coupled with the [NO3]- profiles, to constrain the C:N of the degrading organic matter, the [NO3]- fluxes were converted to benthic organic carbon degradation rates. The range in benthic organic carbon degradation rates is 7-30 ?mol cm**-2 y**-1, with maximum values at the equator and minimum values at the southern end of the transect. The zonal trend of benthic degradation rates, with its equatorial maximum and with elevated values skewed to the north of the equator, is similar to the pattern of primary production observed in the region. Benthic organic carbon degradation is 1-2% of primary production. The range of benthic biogenic silica dissolution rates is 6.9-20 µmol cm**-2 y**-1, representing 2.5-5% of silicon fixation in the surface ocean of the region. Its zonal pattern is distinctly different from that of organic carbon degradation: the range in the ratio of silica dissolution to carbon degradation along the transect is 0.44-1.7 mol Si mol C**-1, with maximum values occurring between 12°S and 2°S, and with fairly constant values of 0.5-0.7 north of the equator. A box model calculation of the average lifetime of the organic carbon in the upper 1 cm of the sediments, where 80 +/- 11% of benthic organic carbon degradation occurs, indicates that it is short: from 3.1 years at high flux stations to 11 years at low flux stations. The reactive component of the organic matter must have a shorter lifetime than this average value. In contrast, the average lifetime of biogenic silica in the upper centimeter of these sediments is 55 +/- 28 years, and shows no systematic variations with benthic flux.
Project(s):
Department of Geology, Oregon State University (OSU)
Coverage:
Median Latitude: 0.210625 * Median Longitude: -135.366250 * South-bound Latitude: -14.900000 * West-bound Longitude: -143.970000 * North-bound Latitude: 11.080000 * East-bound Longitude: -132.900000
Event(s):
W8803B-T-12 * Latitude: -12.150000 * Longitude: -134.350000 * Elevation: -4255.0 m * Campaign: W8803B * Basis: Wecoma * Device: Gravity corer (GC)
W8803B-T-16 * Latitude: -8.980000 * Longitude: -143.970000 * Elevation: -4465.0 m * Campaign: W8803B * Basis: Wecoma * Device: Gravity corer (GC)
W8803B-T-23 * Latitude: -5.980000 * Longitude: -135.000000 * Elevation: -4590.0 m * Campaign: W8803B * Basis: Wecoma * Device: Gravity corer (GC) * Comment: Tetrahedron cores
Size:
16 datasets

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Datasets listed in this publication series

  1. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-12. https://doi.org/10.1594/PANGAEA.76297
  2. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-16. https://doi.org/10.1594/PANGAEA.76298
  3. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-23. https://doi.org/10.1594/PANGAEA.76299
  4. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-31. https://doi.org/10.1594/PANGAEA.76300
  5. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-36. https://doi.org/10.1594/PANGAEA.76303
  6. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-42. https://doi.org/10.1594/PANGAEA.76304
  7. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-47. https://doi.org/10.1594/PANGAEA.76305
  8. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-57. https://doi.org/10.1594/PANGAEA.76306
  9. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-62. https://doi.org/10.1594/PANGAEA.76307
  10. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-68. https://doi.org/10.1594/PANGAEA.76308
  11. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-69. https://doi.org/10.1594/PANGAEA.76309
  12. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-74. https://doi.org/10.1594/PANGAEA.76310
  13. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-89. https://doi.org/10.1594/PANGAEA.76311
  14. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-9. https://doi.org/10.1594/PANGAEA.76302
  15. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Nutrients in pore water in sediment core W8803B-T-92. https://doi.org/10.1594/PANGAEA.76312
  16. Martin, WR; Bender, ML; Leinen, MW et al. (1991): Silica in pore water at sediment surface sample W8803B-T-52. https://doi.org/10.1594/PANGAEA.76301