Publication Date:
2022-05-25
Description:
© The Author(s), 2015. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Palaeogeography, Palaeoclimatology, Palaeoecology 440 (2015): 561-563, doi:10.1016/j.palaeo.2015.09.042.
Description:
Benthic foraminiferal stable isotopic records from a transect of sediment cores south
of the Iceland-Scotland Ridge reveal that the penetration depth of Iceland-Scotland Overflow
Water (ISOW) varied on orbital timescales with precessional pacing over the past ~ 200 kyr.
Similar, higher benthic foraminiferal δ13 C values (~ 1.0 ‰) were recorded at all transect sites
downstream of the Iceland-Scotland Ridge during interglacial periods (Marine Isotope
Chrons 5 and 1), indicating a deeply penetrating ISOW. During glacial periods (Marine
Isotope Chrons 6, 4, and 2), benthic foraminiferal δ13C values from the deeper (2700-3300
m), southern sites within this transect were significantly lower (~ 0.5 ‰) than values from the
northern (shallower) portion of the transect (~ 1.0 ‰), reflecting a shoaling of ISOW and
greater influence of glacial Southern Component Water (SCW) in the deep Northeast
Atlantic. Particularly during intermediate climate states, ISOW strength is driven by
precesional cycles, superimposed on the large-scale glacial-interglacial ISOW variability.
Millennial-scale variability in the penetration of ISOW, likely caused by high-frequency
Heinrich and Dansgaard-Oeschger Events, is most pronounced during intermediate climate
states.
Description:
This research was supported by
National Science Foundation grant OCE-0095219 to J.D. Wright
Description:
2016-10-03
Repository Name:
Woods Hole Open Access Server
Type:
Preprint
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