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Ng, Hong Chin; Robinson, Laura F; McManus, Jerry F (2018): Atlantic Pa/Th composite, new tropical Atlantic sedimentary Pa/Th data and age models [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.890942, Supplement to: Ng, Hong Chin; Robinson, Laura F; McManus, Jerry F; Mohamed, Kais J; Jacobel, Allison W; Ivanovic, Ruza F; Gregoire, Lauren J; Chen, Tianyu (2018): Coherent deglacial changes in western Atlantic Ocean circulation. Nature Communications, 9(1), https://doi.org/10.1038/s41467-018-05312-3

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Abstract:
Abrupt climate changes in the past have been attributed to variations in Atlantic Meridional Overturning Circulation (AMOC) strength. However, the exact timing and magnitude of past AMOC shifts remain elusive, which continues to limit our understanding of the driving mechanisms of such climate variability. Here we show a remarkably consistent signal of the 231Pa/230Th proxy that reveals a spatially coherent picture of western Atlantic circulation changes over the last deglaciation, during abrupt millennial-scale climate transitions. At the onset of deglaciation, we observe an early slowdown of circulation in the western Atlantic from around 19 to 16.5 thousand years ago (ka), consistent with the timing of accelerated Eurasian ice melting. The subsequent weakened AMOC state persists for over a millennium (~16.5-15 ka), during which time there is substantial ice rafting from the Laurentide ice sheet. This timing indicates a role for melting ice in driving a two-step AMOC slowdown, with a positive feedback sustaining continued iceberg calving and climate change during Heinrich Stadial 1.
Coverage:
Median Latitude: 8.529750 * Median Longitude: -40.310825 * South-bound Latitude: 5.313300 * West-bound Longitude: -50.992000 * North-bound Latitude: 15.464000 * East-bound Longitude: -21.796300
Date/Time Start: 2013-10-28T16:13:00 * Date/Time End: 2013-11-26T19:43:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
13 datasets

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Datasets listed in this publication series

  1. Ng, HC; Robinson, LF; McManus, JF (2018): Age model of EW9209-1JPC sediment core. https://doi.org/10.1594/PANGAEA.890932
  2. Ng, HC; Robinson, LF; McManus, JF (2018): Chronological tie-points in EW9209-1JPC sediment core. https://doi.org/10.1594/PANGAEA.890936
  3. Ng, HC; Robinson, LF; McManus, JF (2018): Uranium, thorium and protactinium activity concentrations and isotopic ratios and opal content in EW9209-1JPC sediment core. https://doi.org/10.1594/PANGAEA.890927
  4. Ng, HC; Robinson, LF; McManus, JF (2018): Age model of EW9209-3JPC sediment core. https://doi.org/10.1594/PANGAEA.890933
  5. Ng, HC; Robinson, LF; McManus, JF (2018): Chronological tie-points in EW9209-3JPC sediment core. https://doi.org/10.1594/PANGAEA.890937
  6. Ng, HC; Robinson, LF; McManus, JF (2018): Uranium, thorium and protactinium activity concentrations and isotopic ratios and opal content in EW9209-3JPC sediment core. https://doi.org/10.1594/PANGAEA.890928
  7. Ng, HC; Robinson, LF; McManus, JF (2018): Composite protactinium/thorium record in sediment cores from North Atlantic Ocean. https://doi.org/10.1594/PANGAEA.890941
  8. Ng, HC; Robinson, LF; McManus, JF (2018): Age model of JC094-GVY01 sediment core. https://doi.org/10.1594/PANGAEA.890934
  9. Ng, HC; Robinson, LF; McManus, JF (2018): Chronological tie-points in JC094-GVY01 sediment core. https://doi.org/10.1594/PANGAEA.890938
  10. Ng, HC; Robinson, LF; McManus, JF (2018): Uranium, thorium and protactinium activity concentrations and isotopic ratios and opal content in JC094-GVY01 sediment core. https://doi.org/10.1594/PANGAEA.890929
  11. Ng, HC; Robinson, LF; McManus, JF (2018): Age model of JC094-GVY14 sediment core. https://doi.org/10.1594/PANGAEA.890935
  12. Ng, HC; Robinson, LF; McManus, JF (2018): Chronological tie-points in JC094-GVY14 sediment core. https://doi.org/10.1594/PANGAEA.890939
  13. Ng, HC; Robinson, LF; McManus, JF (2018): Uranium, thorium and protactinium activity concentrations and isotopic ratios and opal content in JC094-GVY14 sediment core. https://doi.org/10.1594/PANGAEA.890930