@article {2825,
	title = {Glacial{\textendash}interglacial Nd isotope variability of North Atlantic Deep Water modulated by North American ice sheet},
	journal = {Nature Communications},
	volume = {10},
	year = {2019},
	month = {Jan-12-2019},
	abstract = {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.},
	doi = {10.1038/s41467-019-13707-z},
	url = {http://www.nature.com/articles/s41467-019-13707-z},
	author = {Zhao, Ning and Oppo, Delia W. and Huang, Kuo-Fang and Howe, Jacob N. W. and Blusztajn, Jerzy and Keigwin, Lloyd D.}
}
@article {2588,
	title = {Decreased influence of Antarctic intermediate water in the tropical Atlantic during North Atlantic cold events},
	journal = {Earth and Planetary Science Letters},
	volume = {389},
	year = {2014},
	month = {Jan-03-2014},
	pages = {200 - 208},
	abstract = {Antarctic Intermediate Water (AAIW) is a key player in the global ocean circulation, contributing to the upper limb of the Atlantic Meridional Overturning Circulation (AMOC), and influencing interhemispheric heat exchange and the distribution of salinity, nutrients and carbon. However, the deglacial history of AAIW flow into the North Atlantic is controversial. Here we present a multicore-top neodymium isotope calibration, which confirms the ability of unclean foraminifera to faithfully record bottom water neodymium isotopic composition () values in their authigenic coatings. We then present the first foraminifera-based reconstruction of from three sediment cores retrieved from within modern AAIW, in the western tropical North Atlantic. Our records reveal similar glacial and interglacial contributions of AAIW, and a pronounced decrease in the AAIW fraction during North Atlantic deglacial cold episodes, Heinrich Stadial 1 (HS1) and Younger Dryas (YD). Our results suggest two separate phases of reduced fraction of AAIW in the tropical Atlantic during HS1, with a greater reduction during early HS1. If a reduction in AAIW fraction also reflects reduced AMOC strength, this finding may explain why, in many regions, there are two phases of hydrologic change within HS1, and why atmospheric CO2 rose more rapidly during early than late HS1. Our result suggesting less flow of AAIW into the Atlantic during North Atlantic cold events contrasts with evidence from the Pacific, where intermediate-depth records may indicate increased flow of AAIW into the Pacific during the these same events. Antiphased behavior between intermediate depths of the North Atlantic and Pacific implies that the flow of AAIW into Atlantic and Pacific seesawed during the last deglaciation.},
	keywords = {antarctic intermediate water, Atlantic meridional overturning circulation, deglacial variability, Nd isotopes, North Atlantic cold events},
	issn = {0012821X},
	doi = {10.1016/j.epsl.2013.12.037},
	url = {https://doi.org/10.1016/j.epsl.2013.12.037},
	author = {Huang, Kuo-Fang and Oppo, Delia W. and Curry, William B.}
}
