Deglacial patterns of South Pacific overturning inferred from 231Pa and 230Th

Ronge, Thomas A.; Lippold, Jörg; Geibert, Walter; Jaccard, Samuel L.; Mieruch-Schnülle, Sebastian; Süfke, Finn; Tiedemann, Ralf (2021). Deglacial patterns of South Pacific overturning inferred from 231Pa and 230Th. Scientific reports, 11(1), p. 20473. Springer Nature 10.1038/s41598-021-00111-1

Preview

Text Ronge_et_al.__21.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (3MB) | Preview

The millennial‐scale variability of the Atlantic Meridional Overturning Circulation (AMOC) is well documented for the last glacial termination and beyond. Despite its importance for the climate system, the evolution of the South Pacific overturning circulation (SPOC) is by far less well understood. A recently published study highlights the potential applicability of the 231Pa/230Th‐proxy in the Pacific. Here, we present five sedimentary down‐core profiles of 231Pa/230Th‐ratios measured on a depth transect from the Pacific sector of the Southern Ocean to test this hypothesis using downcore records. Our data are consistent with an increase in SPOC as early as 20 ka that peaked during Heinrich Stadial 1. The timing indicates that the SPOC did not simply react to AMOC changes via the bipolar seesaw but were triggered via Southern Hemisphere processes.

Interest & Impact

Downloads

42 since deposited on 25 Oct 2021
22 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item