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The Neodymium Isotope Fingerprint of Adélie Coast Bottom Water
Author(s) -
Lambelet M.,
Flierdt T.,
Butler E. C. V.,
Bowie A. R.,
Rintoul S. R.,
Watson R. J.,
Remenyi T.,
Lannuzel D.,
Warner M.,
Robinson L. F.,
Bostock H. C.,
Bradtmiller L. I.
Publication year - 2018
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl080074
Subject(s) - antarctic bottom water , geology , bottom water , oceanography , circumpolar deep water , water mass , abyssal zone , isotopic signature , ice shelf , geochemistry , isotope , thermohaline circulation , north atlantic deep water , sea ice , cryosphere , physics , quantum mechanics
Adélie Land Bottom Water (ALBW), a variety of Antarctic Bottom Water formed off the Adélie Land coast of East Antarctica, ventilates the abyssal layers of the Australian sector of the Southern Ocean as well as the eastern Indian and Pacific Oceans. We present the first dissolved neodymium (Nd) isotope and concentration measurements for ALBW. The summertime signature of ALBW is characterized by ε Nd = −8.9, distinct from Ross Sea Bottom Water, and similar to Weddell Sea Bottom Water. Adélie Land Shelf Water, the precursor water mass for wintertime ALBW, features the least radiogenic Nd fingerprint observed around Antarctica to date (ε Nd = −9.9). Local geology around Antarctica is important in setting the chemical signature of individual varieties of Antarctic Bottom Water, evident from the shelf water signature, which should be considered in the absence of direct wintertime observations.