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Monien, Patrick; Lettmann, Karsten Alexander; Monien, Donata; Asendorf, Sanja; Wölfl, Anne-Cathrin; Lim, Chai Heng; Thal, Janis; Schnetger, Bernhard; Brumsack, Hans-Jürgen (2014): Sediment and pore water geochemistry of sediment cores, Potter Cove, King George Island. PANGAEA, https://doi.org/10.1594/PANGAEA.832335, Supplement to: Monien, P et al. (2014): Redox conditions and trace metal cycling in coastal sediments from the maritime Antarctic. Geochimica et Cosmochimica Acta, 141, 26-44, https://doi.org/10.1016/j.gca.2014.06.003

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Abstract:
Redox-sensitive trace metals (Mn, Fe, U, Mo, Re), nutrients and terminal metabolic products (NO3-, NH4+, PO43-, total alkalinity) were for the first time investigated in pore waters of Antarctic coastal sediments. The results of this study reveal a high spatial variability in redox conditions in surface sediments from Potter Cove, King George Island, western Antarctic Peninsula. Particularly in the shallower areas of the bay the significant correlation between sulphate depletion and total alkalinity, the inorganic product of terminal metabolism, indicates sulphate reduction to be the major pathway of organic matter mineralisation. In contrast, dissimilatory metal oxide reduction seems to be prevailing in the newly ice-free areas and the deeper troughs, where concentrations of dissolved iron of up to 700 µM were found. We suggest that the increased accumulation of fine-grained material with high amounts of reducible metal oxides in combination with the reduced availability of metabolisable organic matter and enhanced physical and biological disturbance by bottom water currents, ice scouring and burrowing organisms favours metal oxide reduction over sulphate reduction in these areas. Based on modelled iron fluxes we calculate the contribution of the Antarctic shelf to the pool of potentially bioavailable iron (Feb) to be 6.9x10**3 to 790x10**3 t/yr. Consequently, these shelf sediments would provide an Feb flux of 0.35-39.5/mg/m**2/yr (median: 3.8 mg/m**2/yr) to the Southern Ocean. This contribution is in the same order of magnitude as the flux provided by icebergs and significantly higher than the input by aeolian dust. For this reason suboxic shelf sediments form a key source of iron for the high nutrient-low chlorophyll (HNLC) areas of the Southern Ocean. This source may become even more important in the future due to rising temperatures at the WAP accompanied by enhanced glacier retreat and the accumulation of melt water derived iron-rich material on the shelf.
Coverage:
Median Latitude: -62.230540 * Median Longitude: -58.664655 * South-bound Latitude: -62.245529 * West-bound Longitude: -58.702625 * North-bound Latitude: -62.221619 * East-bound Longitude: -58.639113
Date/Time Start: 2010-01-21T18:00:00 * Date/Time End: 2011-02-10T15:30:00
Size:
60 datasets

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Datasets listed in this publication series

  1. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Geochemistry of sediment core PC-K17, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.809892
  2. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Geochemistry of sediment core PC-K21, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805808
  3. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Geochemistry of sediment core PC-K29, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805815
  4. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Geochemistry of sediment core PC-K42, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805875
  5. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Geochemistry of sediment core PC-K48, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805880
  6. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Geochemistry of sediment core PC-KX4, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805919
  7. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-K17, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832274
  8. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-K48, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832277
  9. Monien, P; Asendorf, S; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-KX4, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832279
  10. Monien, P; Monien, D; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-P01a, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832280
  11. Monien, P; Monien, D; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-P02a, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832281
  12. Monien, P; Monien, D; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-P03, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832282
  13. Monien, P; Monien, D; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-P04a, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832283
  14. Monien, P; Monien, D; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-P05a, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832284
  15. Monien, P; Monien, D; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-P06a, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832285
  16. Monien, P; Monien, D; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-P07a, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832286
  17. Monien, P; Monien, D; Schnetger, B et al. (2014): Pore water geochemistry of sediment core PC-P08a, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832287
  18. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K09, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805408
  19. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K10, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805406
  20. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K12, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805401
  21. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K14, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805396
  22. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K15, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805807
  23. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K18, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.809894
  24. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K19, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805914
  25. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K22, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805809
  26. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K23, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805810
  27. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K24, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805811
  28. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K25, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805812
  29. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K26, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805813
  30. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K28, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805814
  31. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K30, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805816
  32. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K31, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805866
  33. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K32, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805867
  34. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K33, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805869
  35. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K34, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805870
  36. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K38, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805917
  37. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K39, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805871
  38. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K40, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805872
  39. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K41, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805874
  40. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K43, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805876
  41. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K44, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805877
  42. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K45, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805878
  43. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K46, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805879
  44. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-K49, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805882
  45. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-KX1, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805884
  46. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-KX2, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805885
  47. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-KX3, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805886
  48. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P01b, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805935
  49. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P02b, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805936
  50. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P03, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805937
  51. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P04b, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805938
  52. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P05b, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805939
  53. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P06b, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805940
  54. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P07b, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805942
  55. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P08b, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805941
  56. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P09b, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805943
  57. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P10, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805944
  58. Monien, P; Schnetger, B; Brumsack, H-J (2014): Geochemistry of sediment core PC-P11, Potter Cove, King George Island. https://doi.org/10.1594/PANGAEA.805945
  59. Monien, P; Schnetger, B; Brumsack, H-J (2014): Pore water geochemistry of sediment core PC-K23, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832276
  60. Monien, P; Schnetger, B; Brumsack, H-J (2014): Pore water geochemistry of sediment core PC-KX1, Potter Cove, King Georg Island. https://doi.org/10.1594/PANGAEA.832278