Radiogenic isotope fingerprint of Wilkes Land - Adelie Coast Bottom Water in the circum-Antarctic Ocean

Publication Type  Journal Article
Year of Publication  2006
Authors  van de Flierdt, T.; Hemming, S. R.; Goldstein, S. L.; Abouchami, W.
Journal Title  Geophysical Research Letters
Volume  33
Issue  12
Pages  -
Journal Date  Jun 24
ISBN Number  0094-8276
Accession Number  ISI:000238597800002
Key Words  manganese nodules; circulation; neodymium; southern; seawater; hafnium

Wilkes Land - Adelie Coast Bottom Water encompasses the bottom waters formed around the coast of East Antarctica in the area east of Prydz Bay and west of the Ross Sea ( 90 degrees E - 150 degrees E). Here we show that these bottom waters have not only characteristic physical properties, but also carry a distinct radiogenic isotope signal that traces their dispersal. The Nd, Hf and Pb isotopic compositions of Circum-Antarctic ferromanganese nodules record the isotopic composition of ambient seawater. Those with the lowest Nd and Hf isotopic ratios and the highest Pb isotopic ratios are from the deep Australian- Antarctic Basin, and they fingerprint Wilkes Land - Adelie Coast Bottom Water. The data illustrate the potential value of these isotope systems as tracers of present and past deep and bottom waters in the Circum-Antarctic realm and elsewhere.


057LRTimes Cited:0Cited References Count:20

URL  <Go to ISI>://000238597800002
DOI  Doi 10.1029/2006gl026020