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Anderson, Robert F; Rowe, Gilbert T; Kemp, P F; Trumbore, S; Biscaye, Pierre Eginton (1994): Carbon and Lead chemistry of sediments from the Middle Atlantic Bight [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.730406, Supplement to: Anderson, RF et al. (1994): Carbon budget for the mid-slope depocenter of the Middle Atlantic Bight. Deep Sea Research Part II: Topical Studies in Oceanography, 41(2-3), 669-703, https://doi.org/10.1016/0967-0645(94)90040-X

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Abstract:
A mass budget was constructed for organic carbon on the upper slope of the Middle Atlantic Bight, a region thought to serve as a depocenter for fine-grained material exported from the adjacent shelf. Various components of the budget are internally consistent, and observed differences can be attributed to natural spatial variability or to the different time scales over which measurements were made. The flux of organic carbon to the sediments in the core of the depocenter zone, at a water depth of 1000 m, was measured with sediment traps to be 65 mg C m**-2 day**-1, of which 6-24 mg C m**-2 day**-1 is buried. Oxygen fluxes into the sediments, measured with incubation chambers attached to a free vehicle lander, correspond to total carbon remineralization rates of 49-70 mg C m**-2 day**-1. Carbon remineralization rates estimated from gradients of Corg within the mixed layer, and from gradients of dissolved ammonia and phosphate in pore waters, sum to only 4-6 mg C m**-2 day**-1. Most of the Corg remineralization in slope sediments is mediated by bacteria and takes place within a few mm of the sediment-water interface.
Most of the Corg deposited on the upper slope sediments is supplied by lateral transport from other regions, but even if all of this material were derived from the adjacent shelf, it represents <2% of the mean annual shelf productivity. This value is further lowered by recognizing that as much as half of the Corg deposited on the slope is refractory, having originated by reworking from older deposits. Refractory Corg arrives at the sea bed with an average 14C age 600-900 years older than the pre-bomb 14C age of DIC in seawater, and has a mean life in the sediments with respect to biological remineralization of at least 1000 years. Labile carbon supplied to the slope, on the other hand, is rapidly and (virtually) completely remineralized, with a mean life of < 1 year. Carbon-14 ages of fine-grained carbonate and organic carbon present within the interstices of shelf sands are consistent with this material acting as a source for the old carbon supplied to the slope. Winnowing and export of reworked carbon may contribute to the often-described relationship between organic carbon preservation and accumulation rate of marine sediments.
Project(s):
Atlantic Data Base for Exchange Processes at the Deep Sea Floor (ADEPD)
Funding:
Fourth Framework Programme (FP4), grant/award no. MAS3970126: Atlantic Data Base for Exchange Processes at the Deep Sea Floor
Coverage:
Median Latitude: 37.402333 * Median Longitude: -74.236556 * South-bound Latitude: 36.866667 * West-bound Longitude: -74.613333 * North-bound Latitude: 37.640000 * East-bound Longitude: -73.823333
Date/Time Start: 1988-06-16T00:00:00 * Date/Time End: 1988-10-29T00:00:00
Event(s):
A_EN179-BC1 * Latitude: 37.633333 * Longitude: -74.215000 * Date/Time: 1988-06-16T00:00:00 * Elevation: -417.0 m * Campaign: ADEPDCruises * Method/Device: Box corer (BC) * Comment: Box Corer
A_EN179-BC2 * Latitude: 37.625000 * Longitude: -74.166667 * Date/Time: 1988-06-17T00:00:00 * Elevation: -892.0 m * Campaign: ADEPDCruises * Method/Device: Box corer (BC) * Comment: Box Corer
A_EN179-BC3 * Latitude: 37.640000 * Longitude: -74.143333 * Date/Time: 1988-06-17T00:00:00 * Elevation: -1031.0 m * Campaign: ADEPDCruises * Method/Device: Box corer (BC) * Comment: Box Corer
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
15 datasets

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Datasets listed in this publication series

  1. Anderson, RF; Rowe, GT; Kemp, PF et al. (2005): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN179-BC1. https://doi.org/10.1594/PANGAEA.53382
  2. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN179-BC2. https://doi.org/10.1594/PANGAEA.609886
  3. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN179-BC3. https://doi.org/10.1594/PANGAEA.609887
  4. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN179-BC4. https://doi.org/10.1594/PANGAEA.609888
  5. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN179-BC5. https://doi.org/10.1594/PANGAEA.609890
  6. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN179-BC7. https://doi.org/10.1594/PANGAEA.609891
  7. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC1. https://doi.org/10.1594/PANGAEA.609894
  8. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC3. https://doi.org/10.1594/PANGAEA.609895
  9. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC4. https://doi.org/10.1594/PANGAEA.609896
  10. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC5. https://doi.org/10.1594/PANGAEA.609897
  11. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC6. https://doi.org/10.1594/PANGAEA.609898
  12. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC8. https://doi.org/10.1594/PANGAEA.609899
  13. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC9. https://doi.org/10.1594/PANGAEA.609900
  14. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC10. https://doi.org/10.1594/PANGAEA.609892
  15. Anderson, RF; Rowe, GT; Kemp, PF et al. (2007): TOC, CaCO3, porosity, Lead 210 of sediment core A_EN187-BC11. https://doi.org/10.1594/PANGAEA.609893