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Gherardi, Jeanne-Marie; Labeyrie, Laurent D; Nave, Silvia Osorio; Francois, Roger; McManus, Jerry F; Cortijo, Elsa (2009): Glacial-interglacial sediment record from the North Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.831993, Supplement to: Gherardi, J-M et al. (2009): Glacial-interglacial circulation changes inferred from 231Pa/230Th sedimentary record in the North Atlantic region. Paleoceanography, 24(2), PA2204, https://doi.org/10.1029/2008PA001696

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Abstract:
Studies from the subtropical western and eastern Atlantic Ocean, using the 231Pa/230Th ratio as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of meridional overturning circulation (MOC) over the last deglaciation. In this study, we present a compilation of existing and new sedimentary 231Pa/230Th records from North Atlantic cores between 1710 and 4550 m water depth. Comparing sedimentary 231Pa/230Th from different depths provides new insights into the evolution of the geometry and rate of deep water formation in the North Atlantic during the last 20,000 years. The 231Pa/230Th ratio measured in upper Holocene sediments indicates slow water renewal above ~2500 m and rapid flushing below, consistent with our understanding of modern circulation. In contrast, during the Last Glacial Maximum (LGM), Glacial North Atlantic Intermediate Water (GNAIW) drove a rapid overturning circulation to a depth of at least ~3000 m depth. Below ~4000 m, water renewal was much slower than today. At the onset of Heinrich event 1, transport by the overturning circulation declined at all depths. GNAIW shoaled above 3000 m and significantly weakened but did not totally shut down. During the Bølling-Allerød (BA) that followed, water renewal rates further decreased above 2000 m but increased below. Our results suggest for the first time that ocean circulation during that period was quite distinct from the modern circulation mode, with a comparatively higher renewal rate above 3000 m and a lower renewal rate below in a pattern similar to the LGM but less accentuated. MOC during the Younger Dryas appears very similar to BA down to 2000 m and slightly slower below.
Project(s):
International Marine Global Change Study (IMAGES)
Coverage:
Median Latitude: 44.011104 * Median Longitude: -31.300649 * South-bound Latitude: 37.087167 * West-bound Longitude: -47.413200 * North-bound Latitude: 55.500000 * East-bound Longitude: -14.583333
Date/Time Start: 1990-01-01T00:00:00 * Date/Time End: 1995-06-30T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Gherardi, J-M; Labeyrie, LD; Nave, SO et al. (2009): (Table 2) Age determination for sediment cores CH69-K09 and MD95-2027. https://doi.org/10.1594/PANGAEA.831991
  2. Gherardi, J-M; Labeyrie, LD; Nave, SO et al. (2009): (Table 3) Age determination for sediment core MD95-2037. https://doi.org/10.1594/PANGAEA.831992
  3. Gherardi, J-M; Labeyrie, LD; Nave, SO et al. (2009): Geochemical measurements from Holocene of three cores from the North Atlantic. https://doi.org/10.1594/PANGAEA.760022
  4. Gherardi, J-M; Labeyrie, LD; Nave, SO et al. (2009): (Table 1) Age determination for sediment cores NA87-22 and SU90-44. https://doi.org/10.1594/PANGAEA.831990