Glacial-interglacial Nd isotope variability of North Atlantic Deep Water modulated by North American ice sheet
Oppo, Delia W.
Howe, Jacob N. W.
Blusztajn, Jerzy S.
Keigwin, Lloyd D.
MetadataShow full item record
The Nd isotope composition of seawater has been used to reconstruct past changes in the contribution of different water masses to the deep ocean. In the absence of contrary information, the Nd isotope compositions of endmember water masses are usually assumed constant during the Quaternary. Here we show that the Nd isotope composition of North Atlantic Deep Water (NADW), a major component of the global overturning ocean circulation, was significantly more radiogenic than modern during the Last Glacial Maximum (LGM), and shifted towards modern values during the deglaciation. We propose that weathering contributions of unradiogenic Nd modulated by the North American Ice Sheet dominated the evolution of the NADW Nd isotope endmember. If water mass mixing dominated the distribution of deep glacial Atlantic Nd isotopes, our results would imply a larger fraction of NADW in the deep Atlantic during the LGM and deglaciation than reconstructed with a constant northern endmember.
© The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Zhao, N., Oppo, D. W., Huang, K., Howe, J. N. W., Blusztajn, J., & Keigwin, L. D. Glacial-interglacial Nd isotope variability of North Atlantic Deep Water modulated by North American ice sheet. Nature Communications, 10, (2019): 5773, doi: 10.1038/s41467-019-13707-z.
Suggested CitationZhao, N., Oppo, D. W., Huang, K., Howe, J. N. W., Blusztajn, J., & Keigwin, L. D. (2019). Glacial-interglacial Nd isotope variability of North Atlantic Deep Water modulated by North American ice sheet. Nature Communications, 10, 5773.
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
Changes in the North Atlantic Oscillation influence CO2 uptake in the North Atlantic over the past 2 decades Thomas, Helmuth; Prowe, A. E. Friederike; Lima, Ivan D.; Doney, Scott C.; Wanninkhof, Rik; Greatbatch, Richard J.; Schuster, Ute; Corbiere, Antoine (American Geophysical Union, 2008-12-31)Observational studies report a rapid decline of ocean CO2 uptake in the temperate North Atlantic during the last decade. We analyze these findings using ocean physical-biological numerical simulations forced with interannually ...
Keigwin, Lloyd D.; Cook, Mea S. (American Geophysical Union, 2007-07-11)A simple ocean/atmosphere feedback may reduce the amplitude of climate variability in around the North Atlantic during interglacial compared to glacial states. When climate is warm in the North Atlantic region, the ...
The metabolic response of thecosome pteropods from the North Atlantic and North Pacific oceans to high CO2 and low O2 Maas, Amy E.; Lawson, Gareth L.; Wang, Zhaohui Aleck (Copernicus Publications on behalf of the European Geosciences Union, 2016-11-17)As anthropogenic activities directly and indirectly increase carbon dioxide (CO2) and decrease oxygen (O2) concentrations in the ocean system, it becomes important to understand how different populations of marine animals ...