Deglacial variability of Antarctic Intermediate Water penetration into the North Atlantic from authigenic neodymium isotope ratios

Type Article
Date 2012-08
Language English
Author(s) Xie Ruifang C.1, Marcantonio Franco1, Schmidt Matthew W.2
Affiliation(s) 1 : Texas A&M Univ, Dept Geol & Geophys, College Stn, TX 77843 USA.
2 : Texas A&M Univ, Dept Oceanog, College Stn, TX 77843 USA.
Source Paleoceanography (0883-8305) (Amer Geophysical Union), 2012-08 , Vol. 27 , N. PA3221 , P. 1-12
DOI 10.1029/2012PA002337
WOS© Times Cited 36
Abstract Understanding intermediate water circulation across the last deglacial is critical in assessing the role of oceanic heat transport associated with Atlantic Meridional Overturning Circulation variability across abrupt climate events. However, the links between intermediate water circulation and abrupt climate events such as the Younger Dryas (YD) and Heinrich Event 1 (H1) are still poorly constrained. Here, we reconstruct changes in Antarctic Intermediate Water (AAIW) circulation in the subtropical North Atlantic over the past 25 kyr by measuring authigenic neodymium isotope ratios in sediments from two sites in the Florida Straits. Our authigenic Nd isotope records suggest that there was little to no penetration of AAIW into the subtropical North Atlantic during the YD and H1. Variations in the northward penetration of AAIW into the Florida Straits documented in our authigenic Nd isotope record are synchronous with multiple climatic archives, including the Greenland ice core delta O-18 record, the Cariaco Basin atmosphere Delta C-14 reconstruction, the Bermuda Rise sedimentary Pa/Th record, and nutrient and stable isotope data from the tropical North Atlantic. The synchroneity of our Nd records with multiple climatic archives suggests a tight connection between AAIW variability and high-latitude North Atlantic climate change.
Full Text
File Pages Size Access
Publisher's official version 12 927 KB Open access
Top of the page