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

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....

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Bibliographic Details
Published in:Scientific reports 2021-10, Vol.11 (1), p.20473
Main Authors: Ronge, Thomas A, Lippold, Jörg, Geibert, Walter, Jaccard, Samuel L, Mieruch-Schnülle, Sebastian, Süfke, Finn, Tiedemann, Ralf
Format: Article
Language:English
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Summary: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 Pa/ Th-proxy in the Pacific. Here, we present five sedimentary down-core profiles of Pa/ Th-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.
ISSN:2045-2322
DOI:10.1038/s41598-021-00111-1