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Knudson, Karla P; Ravelo, Ana Christina (2017): Evidence for enhanced North Pacific Intermediate Water in the Bering Sea during extreme glacials over the past 1.2 Ma from records of stable isotopes analyzed at IODP Site 323-U1342 Holes A, C, and D [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.876180, Supplement to: Knudson, KP; Ravelo, AC (2015): North Pacific Intermediate Water circulation enhanced by the closure of the Bering Strait. Paleoceanography, 30(10), 1287-1304, https://doi.org/10.1002/2015PA002840

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Abstract:
The Bering Strait provides a shallow connection that allows freshwater to flow from the North Pacific into the North Atlantic, but this passage was closed during past glacials when sea level was at least 50 m lower than at present. Climate models investigating Bering Strait closure predict that this mechanism increases the salinity in the North Atlantic and reduces the salinity in the North Pacific, inducing a Pacific-Atlantic seesaw in meridional overturning circulation and poleward heat flux. However, the Pacific circulation response to Bering Strait closure, and thus the seesaw theory, has not been tested by long paleoceanographic records. We present long records of foraminiferal d18O and d13C from Integrated Ocean Drilling Program Site 323-U1342 in the Bering Sea, which provide the first evidence of enhanced North Pacific Intermediate Water when the Bering Strait was closed during each of the extreme glacials of the last 1.2 Myr. These results suggest that orbital-scale variations in North Pacific Intermediate Water are coherent and in phase with variations in upper North Atlantic Deep Water but are unrelated to changes in lower North Atlantic Deep Water. Together, these results provide evidence for systematic, orbital-scale variability in North Pacific Ocean circulation and may challenge the idea of an orbital-scale Pacific-Atlantic seesaw.
Related to:
Knudson, Karla P; Ravelo, Ana Christina (2015): Enhanced subarctic Pacific stratification and nutrient utilization during glacials over the last 1.2 Myr. Geophysical Research Letters, 42(22), 9870-9879, https://doi.org/10.1002/2015GL066317
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Median Latitude: 54.828310 * Median Longitude: 176.916882 * South-bound Latitude: 54.828300 * West-bound Longitude: 176.916712 * North-bound Latitude: 54.828362 * East-bound Longitude: 176.917053
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Knudson, KP; Ravelo, AC (2017): Age model tie points from IODP Site 323-U1342. https://doi.org/10.1594/PANGAEA.876175
  2. Knudson, KP; Ravelo, AC (2017): Carbon mass accumulation rate from different holes of IODP Site 323-U1342. https://doi.org/10.1594/PANGAEA.876178
  3. Knudson, KP; Ravelo, AC (2017): Difference calculations with isotope tracers (Delta δ¹³C) from IODP Site 138-849 and 323-U1342. https://doi.org/10.1594/PANGAEA.876173
  4. Knudson, KP; Ravelo, AC (2017): Difference calculations with isotope tracers (Delta δ¹⁸O) from IODP Site 138-849 and 323-U1342. https://doi.org/10.1594/PANGAEA.876174
  5. Knudson, KP; Ravelo, AC (2017): Isotopes of benthic foraminifera from different holes of IODP Site 323-U1342. https://doi.org/10.1594/PANGAEA.876179
  6. Knudson, KP; Ravelo, AC (2017): Carbonate-free sediment analysis different holes of IODP Site 323-U1342. https://doi.org/10.1594/PANGAEA.876177