Open AccessDeglacial variability of Antarctic Intermediate Water penetration into the North Atlantic from authigenic neodymium isotope ratios
Author(s) -
Xie Ruifang C.,
Marcantonio Franco,
Schmidt Matthew W.
Publication year - 2012
Publication title -
paleoceanography
Language(s) - English
Resource type - Journals
eISSN - 1944-9186
pISSN - 0883-8305
DOI - 10.1029/2012pa002337
Subject(s) - authigenic , geology , oceanography , north atlantic deep water , younger dryas , antarctic intermediate water , thermohaline circulation , ice core , abrupt climate change , climatology , climate change , paleontology , sedimentary rock , global warming , effects of global warming
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 δ 18 O record, the Cariaco Basin atmosphere Δ 14 C 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.