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Rutgers van der Loeff, Michiel M; Berger, Gijs W (1993): Radionuclides in the water column at stations near the Antarctic Polar Front in the South Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.730453, Supplement to: Rutgers van der Loeff, MM; Berger, GW (1993): Scavenging of 230Th and 231Pa near the antarctic polar front in the South Atlantic. Deep Sea Research Part I: Oceanographic Research Papers, 40(2), 339-357, https://doi.org/10.1016/0967-0637(93)90007-P

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Abstract:
Vertical profiles of dissolved and particulate 230Th and 231Pa were obtained across the Antarctic Circumpolar Current (ACC) in the southern Atlantic. North of the Polar Front, dissolved and total 230Th increase with depth in conformity with published scavenging models. There is no depletion of 230Th or 231Pa in the water column south of the Polar Front, thought to be an area of enhanced biological productivity. 230Th concentrations increase three-fold to the Weddell Sea across the ACC. Dissolved and total 231Pa concentrations are relatively constant below 500 m depth at about 0.3 dpm m**-3, and change little with depth or latitude. The results from the Weddell Gyre are explained by a mixing-scavenging model that takes into account the input of lower Circumpolar Deep Water through upwelling, which is the main source of water in the Weddell Gyre and is enriched in 230Th but not in 231Pa. 230Th accumulates in the Weddell Gyre as a result of a reduction in the scavenging rate and by ingrowth from 234U. Ingrowth is more significant for 230Th than for 231Pa because the residence time of water in the gyre (about 35 years) is similar to the scavenging residence time of Th in the south Atlantic (29 years) but shorter than that of Pa (120 years). It is argued that changes in 230Th accumulation in the past may reflect changes in water residence time and in the formation rate of Weddell Sea Deep Water.
Project(s):
Marine Geochemistry @ AWI (AWI_MarGeoChem)
Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)
Coverage:
Median Latitude: -52.182574 * Median Longitude: -2.736704 * South-bound Latitude: -60.663000 * West-bound Longitude: -27.843333 * North-bound Latitude: -44.477000 * East-bound Longitude: 10.452000
Date/Time Start: 1989-11-05T05:00:00 * Date/Time End: 1991-03-20T00:00:00
Event(s):
PS18/227 (PS2072) * Latitude: -60.663000 * Longitude: 3.942000 * Date/Time: 1991-03-20T00:00:00 * Elevation: -5083.0 m * Location: Maud Rise * Campaign: ANT-IX/3 (PS18) * Basis: Polarstern * Method/Device: Multiple investigations (MULT)
PS1751-8 (PS16/267) * Latitude: -44.477000 * Longitude: 10.452000 * Date/Time: 1989-11-05T05:00:00 * Elevation: -4835.0 m * Location: Agulhas Basin * Campaign: ANT-VIII/3 (PS16) * Basis: Polarstern * Method/Device: Water sample (WS)
PS1755-2 (PS16/281) * Latitude: -47.792000 * Longitude: 7.112167 * Date/Time: 1989-11-07T03:54:00 * Elevation: -4369.0 m * Location: Meteor Rise * Campaign: ANT-VIII/3 (PS16) * Basis: Polarstern * Method/Device: Water sample (WS)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
9 datasets

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Datasets listed in this publication series

  1. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS18/227. https://doi.org/10.1594/PANGAEA.131651
  2. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS1751-8. https://doi.org/10.1594/PANGAEA.131643
  3. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS1755-2. https://doi.org/10.1594/PANGAEA.131644
  4. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS1759-5. https://doi.org/10.1594/PANGAEA.131645
  5. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS1768-2. https://doi.org/10.1594/PANGAEA.131646
  6. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS1772-2. https://doi.org/10.1594/PANGAEA.131647
  7. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS1777-8. https://doi.org/10.1594/PANGAEA.131648
  8. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS1782-7. https://doi.org/10.1594/PANGAEA.131649
  9. Rutgers van der Loeff, MM; Berger, GW (1993): (Table 1) Radionuclides in the water column at station PS1785-1. https://doi.org/10.1594/PANGAEA.131650