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Rutgers van der Loeff, Michiel M; Cai, Pinghe; Stimac, Ingrid; Bracher, Astrid; Middag, Rob; Klunder, Maarten B; van Heuven, Steven (2011): Radionuclides measured on 27 water bottle profiles during POLARSTERN cruise ANT-XXIV/3. PANGAEA, https://doi.org/10.1594/PANGAEA.745479, Supplement to: Rutgers van der Loeff, MM et al. (2011): 234Th in surface waters: distribution of particle export flux across the Antarctic Circumpolar Current and in the Weddell Sea during the GEOTRACES expedition ZERO and DRAKE. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2749-2766, https://doi.org/10.1016/j.dsr2.2011.02.004

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Abstract:
As part of the GEOTRACES Polarstern expedition ANT XXIV/3 (ZERO and DRAKE) we have measured the vertical distribution of 234Th on sections through the Antarctic Circumpolar Current along the zero meridian and in Drake Passage and on an EW section through the Weddell Sea. Steady state export fluxes of 234Th from the upper 100m, derived from the depletion of 234Th with respect to its parent 238U, ranged from 621±105 dpm/m**2/d to 1773±90 dpm/m**2/d. This 234Th flux was converted into an export flux of organic carbon ranging from 3.1-13.2 mmolC/m**2/d (2.1-9.0 mmolC/m**2/d) using POC/234Th ratio of bulk (respectively >50 µm) suspended particles at the export depth (100 m). Non-steady state fluxes assuming zero flux under ice cover were up to 23% higher. In addition, particulate and dissolved 234Th were measured underway in high resolution in the surface water with a semi-automated procedure. Particulate 234Th in surface waters is inversely correlated with light transmission and pCO2 and positively with fluorescence and optical backscatter and is interpreted as a proxy for algal biomass. High resolution underway mapping of particulate and dissolved 234Th in surface water shows clearly where trace elements are absorbed by plankton and where they are exported to depth. Quantitative determination of the export flux requires the full 234Th profile since surface depletion and export flux become decoupled through changes in wind mixed layer depth and in contribution to export from subsurface layers.
In a zone of very low algal abundance (54-58 °S at the zero meridian), confirmed by satellite Chl-a data, the lowest carbon export of the ACC was observed, allowing Fe and Mn to maintain their highest surface concentrations (Klunder et al., this issue, Middag et al., this issue).
An ice-edge bloom that had developed in Dec/Jan in the zone 60-65 °S as studied during the previous leg (Strass et al., in prep) had caused a high export flux at 64.5 °S when we visited the area two months later (Feb/March). The ice-edge bloom had then shifted south to 65-69 °S evident from uptake of CO2 and dissolved Fe, Mn and 234Th, without causing export yet. In this way, the parallel analysis of 234Th can help to explain the scavenging behaviour of other trace elements.
Coverage:
Median Latitude: -60.044493 * Median Longitude: -22.207607 * South-bound Latitude: -69.400100 * West-bound Longitude: -64.443300 * North-bound Latitude: -42.332800 * East-bound Longitude: 8.999500
Date/Time Start: 2008-02-13T15:41:00 * Date/Time End: 2008-04-11T14:14:00
Event(s):
PS71/101-1 * Latitude: -42.332800 * Longitude: 8.999500 * Date/Time: 2008-02-13T15:41:00 * Elevation: -4527.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Device: CTD/Rosette (CTD-RO)
PS71/102-2 * Latitude: -44.660400 * Longitude: 7.097100 * Date/Time: 2008-02-15T07:55:00 * Elevation: -4619.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Device: CTD/Rosette (CTD-RO) * Comment: INST.:AWI; CTD-SN:T1373-C2470
PS71/104-1 * Latitude: -47.656000 * Longitude: 4.274700 * Date/Time: 2008-02-16T22:21:00 * Elevation: -4547.0 m * Location: South Atlantic Ocean * Campaign: ANT-XXIV/3 (PS71) * Basis: Polarstern * Device: CTD/Rosette (CTD-RO) * Comment: INST.:AWI; CTD-SN:T1373-C2470
Size:
27 datasets

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Datasets listed in this publication series

  1. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/101-1. https://doi.org/10.1594/PANGAEA.745451
  2. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/102-2. https://doi.org/10.1594/PANGAEA.745452
  3. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/104-1. https://doi.org/10.1594/PANGAEA.745453
  4. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/108-1. https://doi.org/10.1594/PANGAEA.745454
  5. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/113-7. https://doi.org/10.1594/PANGAEA.745455
  6. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/118-2. https://doi.org/10.1594/PANGAEA.745456
  7. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/125-1. https://doi.org/10.1594/PANGAEA.745457
  8. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/131-1. https://doi.org/10.1594/PANGAEA.745458
  9. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/140-1. https://doi.org/10.1594/PANGAEA.745459
  10. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/149-1. https://doi.org/10.1594/PANGAEA.745460
  11. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/157-1. https://doi.org/10.1594/PANGAEA.745461
  12. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/169-1. https://doi.org/10.1594/PANGAEA.745462
  13. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/178-1. https://doi.org/10.1594/PANGAEA.745463
  14. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/184-1. https://doi.org/10.1594/PANGAEA.745464
  15. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/186-1. https://doi.org/10.1594/PANGAEA.745465
  16. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/192-1. https://doi.org/10.1594/PANGAEA.745466
  17. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/196-1. https://doi.org/10.1594/PANGAEA.745467
  18. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/201-1. https://doi.org/10.1594/PANGAEA.745468
  19. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/204-1. https://doi.org/10.1594/PANGAEA.745469
  20. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/210-2. https://doi.org/10.1594/PANGAEA.745470
  21. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/220-2. https://doi.org/10.1594/PANGAEA.745471
  22. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/222-1. https://doi.org/10.1594/PANGAEA.745472
  23. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/230-2. https://doi.org/10.1594/PANGAEA.745473
  24. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/236-1. https://doi.org/10.1594/PANGAEA.745474
  25. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/241-1. https://doi.org/10.1594/PANGAEA.745475
  26. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/244-6. https://doi.org/10.1594/PANGAEA.745476
  27. Rutgers van der Loeff, MM; Cai, P; Stimac, I et al. (2011): Radionuclides measured on water bottle samples at station PS71/250-5. https://doi.org/10.1594/PANGAEA.745477