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Thomson, John; Colley, S; Anderson, Robert F; Cook, G T; MacKenzie, Angus; Harkness, Douglas D (1993): Thorium and radiocarbon measurements on sediment cores from the Northseast Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.734066, Supplement to: Thomson, J et al. (1993): Holocene sediment fluxes in the northeast Atlantic from 230Th excess and radiocarbon measurements. Paleoceanography, 8(5), 631-650, https://doi.org/10.1029/93PA01366

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Abstract:
Radiocarbon and 230Thexcess data from six NE Atlantic box cores are considered. The cores form a transect from the Porcupine Abyssal Plain over the East Thulean Rise to the southern end of Feni Drift. The chronology for the cores is established from bulk sediment carbonate radiocarbon data and reveals that sections exhibiting constant accumulation rates can be identified in all the cores, with rates of 3.0-3.5 cm/kyr on the plain through the Holocene and late Holocene rates of 4.3-6.6 cm/kyr elsewhere. Five out of the six cores show accumulations of more 230Thexcess than is produced in the overlying water column, with the greatest inventories (up to 225% of production) in the cores from the rise and drift. A size fraction comparison between two cores from the plain and rise reveals that the higher overall accumulation rates and 230Thexcess inventories in the off-plain cores are due to an increased fine (<5 µm) component fraction, whereas the flux of coarser material is similar to that received on the plain. This suggests that the higher fluxes of materials observed are physically (rather than biogeochemically) driven and also that drift formation has been continuously active in the late Holocene. Sections of all the cores where regular accumulation is defined by the radiocarbon data are modeled first by a linear radiocarbon age/depth model and second by a constant rain (230Thexcess)0 model prorated for the observed core inventories. These modeling approaches yield historical mass accumulation rate estimates which are generally in reasonable agreement (±30%), but the differences observed appear to be well organized in time rather than random.
Project(s):
Biogeochemical Ocean Flux Study (BOFS)
Joint Global Ocean Flux Study (JGOFS)
Coverage:
Median Latitude: 50.949168 * Median Longitude: -21.399984 * South-bound Latitude: 47.773700 * West-bound Longitude: -22.592000 * North-bound Latitude: 53.703500 * East-bound Longitude: -19.710700
Date/Time Start: 1989-07-22T00:00:00 * Date/Time End: 1989-07-31T00:00:00
Event(s):
BOFS3C (BOFS11880#5) * Latitude: 47.773700 * Longitude: -19.710700 * Date/Time: 1989-07-22T00:00:00 * Elevation: -4540.0 m * Location: Northeast Atlantic * Campaign: D184 * Basis: Discovery (1962) * Method/Device: Box corer (BC) * Comment: BOFS-ID 5135
BOFS4C (BOFS11881#4) * Latitude: 49.792500 * Longitude: -21.242300 * Date/Time: 1989-07-25T00:00:00 * Elevation: -4067.0 m * Location: Northeast Atlantic * Campaign: D184 * Basis: Discovery (1962) * Method/Device: Box corer (BC) * Comment: BOFS-ID 5263
BOFS5C (BOFS11882#3) * Latitude: 50.678600 * Longitude: -21.862400 * Date/Time: 1989-07-26T00:00:00 * Elevation: -3547.0 m * Location: Northeast Atlantic * Campaign: D184 * Basis: Discovery (1962) * Method/Device: Box corer (BC) * Comment: BOFS-ID 5324
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
7 datasets

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Datasets listed in this publication series

  1. Thomson, J; Colley, S; Anderson, RF et al. (1993): (Table 2) Age determination and sedimentation rates from surface sediments. https://doi.org/10.1594/PANGAEA.199552
  2. Thomson, J; Colley, S; Anderson, RF et al. (1993): (Table 1) Geochemistry of sediment core BOFS3C. https://doi.org/10.1594/PANGAEA.734058
  3. Thomson, J; Colley, S; Anderson, RF et al. (1993): (Table 1) Geochemistry of sediment core BOFS4C. https://doi.org/10.1594/PANGAEA.734059
  4. Thomson, J; Colley, S; Anderson, RF et al. (1993): (Table 1) Geochemistry of sediment core BOFS5C. https://doi.org/10.1594/PANGAEA.734060
  5. Thomson, J; Colley, S; Anderson, RF et al. (1993): (Table 1) Geochemistry of sediment core BOFS7C. https://doi.org/10.1594/PANGAEA.734061
  6. Thomson, J; Colley, S; Anderson, RF et al. (1993): (Table 1) Geochemistry of sediment core BOFS8C. https://doi.org/10.1594/PANGAEA.734062
  7. Thomson, J; Colley, S; Anderson, RF et al. (1993): (Table 1) Geochemistry of sediment core BOFS9C. https://doi.org/10.1594/PANGAEA.734063