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Lichtschlag, Anna; Donis, Daphne; Janssen, Felix; Jessen, Gerdhard L; Holtappels, Moritz; Wenzhöfer, Frank; Mazulmyan, Sonia; Sergeeva, Nelly G; Waldmann, Christoph; Boetius, Antje (2015): High-resolution in situ oxygen microprofiles, porewater and solid phase geochemistry from the Crimean shelf (Black Sea) from Maria S. Merian cruise MSM15/1. PANGAEA, https://doi.org/10.1594/PANGAEA.844879, Supplement to: Lichtschlag, A et al. (2015): Effects of fluctuating hypoxia on benthic oxygen consumption in the Black Sea (Crimean shelf). Biogeosciences, 12, 5075-5092, https://doi.org/10.5194/bg-12-5075-2015

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Abstract:
The outer western Crimean shelf of the Black Sea is a natural laboratory to investigate effects of stable oxic versus varying hypoxic conditions on seafloor biogeochemical processes and benthic community structure. Bottom-water oxygen concentrations ranged from normoxic (175 µmol O2/L) and hypoxic (< 63 µmol O2/L) or even anoxic/sulfidic conditions within a few kilometers' distance. Variations in oxygen concentrations between 160 and 10 µmol/L even occurred within hours close to the chemocline at 134 m water depth. Total oxygen uptake, including diffusive as well as fauna-mediated oxygen consumption, decreased from 15 mmol/m**2/d on average in the oxic zone, to 7 mmol/m**2/d on average in the hypoxic zone, correlating with changes in macrobenthos composition. Benthic diffusive oxygen uptake rates, comprising respiration of microorganisms and small meiofauna, were similar in oxic and hypoxic zones (on average 4.5 mmol/m**2/d), but declined to 1.3 mmol/m**2/d in bottom waters with oxygen concentrations below 20 µmol/L. Measurements and modeling of porewater profiles indicated that reoxidation of reduced compounds played only a minor role in diffusive oxygen uptake under the different oxygen conditions, leaving the major fraction to aerobic degradation of organic carbon. Remineralization efficiency decreased from nearly 100 % in the oxic zone, to 50 % in the oxic-hypoxic zone, to 10 % in the hypoxic-anoxic zone. Overall, the faunal remineralization rate was more important, but also more influenced by fluctuating oxygen concentrations, than microbial and geochemical oxidation processes.
Funding:
Seventh Framework Programme (FP7), grant/award no. 226213: In situ monitoring of oxygen depletion in hypoxic ecosystems of coastal and open seas and land-locked water bodies
Coverage:
Median Latitude: 44.701066 * Median Longitude: 33.017388 * South-bound Latitude: 44.597333 * West-bound Longitude: 32.817167 * North-bound Latitude: 44.825000 * East-bound Longitude: 33.161167
Date/Time Start: 2010-04-26T17:13:00 * Date/Time End: 2010-05-07T03:00:00
Size:
33 datasets

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Datasets listed in this publication series

  1. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_383-1. https://doi.org/10.1594/PANGAEA.779072
  2. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_386-1. https://doi.org/10.1594/PANGAEA.779073
  3. Lichtschlag, A; Boetius, A (2015): Nutrients in pore water samples of sediment core MSM15/1_393-1. https://doi.org/10.1594/PANGAEA.779492
  4. Lichtschlag, A; Boetius, A (2015): Sulphur, iron, and manganese concentrations measured in the solid phase of sediment core MSM15/1_393-1. https://doi.org/10.1594/PANGAEA.779502
  5. Lichtschlag, A; Boetius, A (2015): Sulphate, sulphide, iron, manganese, and methane in pore water samples of sediment core MSM15/1_393-1. https://doi.org/10.1594/PANGAEA.779512
  6. Lichtschlag, A; Boetius, A (2015): Sulphate reduction rates of sediment core MSM15/1_393-1. https://doi.org/10.1594/PANGAEA.779507
  7. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_434-1, deployment 1. https://doi.org/10.1594/PANGAEA.779074
  8. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_434-1, deployment 2. https://doi.org/10.1594/PANGAEA.779075
  9. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_434-1, deployment 3. https://doi.org/10.1594/PANGAEA.779077
  10. Lichtschlag, A; Boetius, A (2015): Nutrients in pore water samples of sediment core MSM15/1_448-1. https://doi.org/10.1594/PANGAEA.779493
  11. Lichtschlag, A; Boetius, A (2015): Sulphur, iron, and manganese concentrations measured in the solid phase of sediment core MSM15/1_448-1. https://doi.org/10.1594/PANGAEA.779503
  12. Lichtschlag, A; Boetius, A (2015): Sulphate, sulphide, iron, manganese, and methane in pore water samples of sediment core MSM15/1_448-1. https://doi.org/10.1594/PANGAEA.779513
  13. Lichtschlag, A; Boetius, A (2015): Sulphate reduction rates of sediment core MSM15/1_448-1. https://doi.org/10.1594/PANGAEA.779508
  14. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_455-1. https://doi.org/10.1594/PANGAEA.779078
  15. Lichtschlag, A; Boetius, A (2015): Nutrients in pore water samples of sediment core MSM15/1_462-1. https://doi.org/10.1594/PANGAEA.779494
  16. Lichtschlag, A; Boetius, A (2015): Sulphur, iron, and manganese concentrations measured in the solid phase of sediment core MSM15/1_462-1. https://doi.org/10.1594/PANGAEA.779504
  17. Lichtschlag, A; Boetius, A (2015): Sulphate, sulphide, iron, manganese, and methane in pore water samples of sediment core MSM15/1_462-1. https://doi.org/10.1594/PANGAEA.779514
  18. Lichtschlag, A; Boetius, A (2015): Sulphate reduction rates of sediment core MSM15/1_462-1. https://doi.org/10.1594/PANGAEA.779509
  19. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofile from the Crimean shelf (Black Sea) at station MSM15/1_469-1, deployment 1. https://doi.org/10.1594/PANGAEA.779079
  20. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofile from the Crimean shelf (Black Sea) at station MSM15/1_469-1, deployment 2. https://doi.org/10.1594/PANGAEA.779080
  21. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofile from the Crimean shelf (Black Sea) at station MSM15/1_469-1, deployment 3. https://doi.org/10.1594/PANGAEA.779081
  22. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_484-1, deployment 1. https://doi.org/10.1594/PANGAEA.779024
  23. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_484-1, deployment 2. https://doi.org/10.1594/PANGAEA.779025
  24. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_484-1, deployment 3. https://doi.org/10.1594/PANGAEA.779026
  25. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_484-1, deployment 4. https://doi.org/10.1594/PANGAEA.779055
  26. Lichtschlag, A; Boetius, A (2015): Nutrients in pore water samples of sediment core MSM15/1_487-1. https://doi.org/10.1594/PANGAEA.779495
  27. Lichtschlag, A; Boetius, A (2015): Sulphur, iron, and manganese concentrations measured in the solid phase of sediment core MSM15/1_487-1. https://doi.org/10.1594/PANGAEA.779505
  28. Lichtschlag, A; Boetius, A (2015): Sulphate, sulphide, iron, manganese, and methane in pore water samples of sediment core MSM15/1_487-1. https://doi.org/10.1594/PANGAEA.779515
  29. Lichtschlag, A; Boetius, A (2015): Sulphate reduction rates of sediment core MSM15/1_487-1. https://doi.org/10.1594/PANGAEA.779510
  30. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_499-1, deployment 1. https://doi.org/10.1594/PANGAEA.779082
  31. Lichtschlag, A; Donis, D; Janssen, F et al. (2015): High-resolution in situ oxygen microprofiles from the Crimean shelf (Black Sea) at station MSM15/1_499-1, deployment 2. https://doi.org/10.1594/PANGAEA.779083
  32. Holtappels, M; Janssen, F; Lichtschlag, A et al. (2015): Physical oceanography at time series station S2-M1-CTD1. https://doi.org/10.1594/PANGAEA.780446
  33. Holtappels, M; Janssen, F; Lichtschlag, A et al. (2015): Physical oceanography at time series station S2-M2-CTD1. https://doi.org/10.1594/PANGAEA.780448