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McGee, David; deMenocal, Peter B; Winckler, Gisela; Stuut, Jan-Berend W; Bradtmiller, Louisa I (2013): Reconstructions of eolian dust accumulation in northwest African margin sediments. PANGAEA, https://doi.org/10.1594/PANGAEA.836112, Supplement to: McGee, D et al. (2013): The magnitude, timing and abruptness of changes in North African dust deposition over the last 20,000yr. Earth and Planetary Science Letters, 371-372, 163-176, https://doi.org/10.1016/j.epsl.2013.03.054

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Abstract:
Reconstructions of eolian dust accumulation in northwest African margin sediments provide important continuous records of past changes in atmospheric circulation and aridity in the region. Existing records indicate dramatic changes in North African dust emissions over the last 20 ka, but the limited spatial extent of these records and the lack of high-resolution flux data do not allow us to determine whether changes in dust deposition occurred with similar timing, magnitude and abruptness throughout northwest Africa. Here we present new records from a meridional transect of cores stretching from 31°N to 19°N along the northwest African margin. By combining grain size endmember modeling with 230Th-normalized fluxes for the first time, we are able to document spatial and temporal changes in dust deposition under the North African dust plume throughout the last 20 ka. Our results provide quantitative estimates of the magnitude of dust flux changes associated with Heinrich Stadial 1, the Younger Dryas, and the African Humid Period (AHP; ~11.7-5 ka), offering robust targets for model-based estimates of the climatic and biogeochemical impacts of past changes in North African dust emissions. Our data suggest that dust fluxes between 8 and 6 ka were a factor of ~5 lower than average fluxes during the last 2 ka. Using a simple model to estimate the effects of bioturbation on dust input signals, we find that our data are consistent with abrupt, synchronous changes in dust fluxes in all cores at the beginning and end of the AHP. The mean ages of these transitions are 11.8±0.2 ka (1Sigma) and 4.9±0.2 ka, respectively.
Coverage:
Median Latitude: 24.060213 * Median Longitude: -15.727272 * South-bound Latitude: 18.647000 * West-bound Longitude: -18.590000 * North-bound Latitude: 30.880000 * East-bound Longitude: -10.630000
Size:
46 datasets

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Datasets listed in this publication series

  1. McGee, D; deMenocal, PB; Winckler, G et al. (2013): (Table 1) Core locations, depths and distances from modern and LGM shorelines. https://doi.org/10.1594/PANGAEA.835971
  2. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Age model of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.835981
  3. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Age model of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.835994
  4. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Age model of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.835983
  5. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Age model of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.835984
  6. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Age model of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836001
  7. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Best-fit Weibull distributions of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.836045
  8. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Best-fit Weibull distributions of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.836046
  9. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Best-fit Weibull distributions of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.836047
  10. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Best-fit Weibull distributions of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.836048
  11. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Best-fit Weibull distributions of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836049
  12. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Calcium carbonatel of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.835995
  13. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Calcium carbonatel of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.835996
  14. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Calcium carbonatel of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.835997
  15. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Calcium carbonatel of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.835998
  16. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Calcium carbonatel of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836003
  17. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Dust fluxes of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.836079
  18. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Dust fluxes of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.836080
  19. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Dust fluxes of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.836081
  20. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Dust fluxes of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.836082
  21. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Dust fluxes of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836083
  22. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size endmember modeling of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.836035
  23. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size endmember modeling of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.836036
  24. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size endmember modeling of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.836037
  25. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size endmember modeling of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.836038
  26. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size endmember modeling of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836039
  27. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size measurements of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.836054
  28. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size measurements of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.836055
  29. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size measurements of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.836056
  30. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size measurements of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.836057
  31. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Grain size measurements of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836053
  32. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Radiocarbon measurements of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.836028
  33. McGee, D; deMenocal, PB; Winckler, G et al. (2014): Radiocarbon measurements of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.836029
  34. McGee, D; deMenocal, PB; Winckler, G et al. (2014): Radiocarbon measurements of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.836030
  35. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Radiocarbon measurements of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.836031
  36. McGee, D; deMenocal, PB; Winckler, G et al. (2014): Radiocarbon measurements of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836032
  37. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Raw 14C data of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.836016
  38. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Raw 14C data of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.836017
  39. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Raw 14C data of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.836018
  40. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Raw 14C data of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.836019
  41. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Raw 14C data of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836020
  42. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Uranium and Thorium isotope measurements of sediment core OC437-07_GC27. https://doi.org/10.1594/PANGAEA.836008
  43. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Uranium and Thorium isotope measurements of sediment core OC437-07_GC37. https://doi.org/10.1594/PANGAEA.836009
  44. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Uranium and Thorium isotope measurements of sediment core OC437-07_GC49. https://doi.org/10.1594/PANGAEA.836010
  45. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Uranium and Thorium isotope measurements of sediment core OC437-07_GC66. https://doi.org/10.1594/PANGAEA.836011
  46. McGee, D; deMenocal, PB; Winckler, G et al. (2013): Uranium and Thorium isotope measurements of sediment core OC437-07_GC68. https://doi.org/10.1594/PANGAEA.836012