Deglacial patterns of South Pacific overturning inferred from 231Pa and 230Th
| Type | Article | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Date | 2021-10 | ||||||||||||
| Language | English | ||||||||||||
| Author(s) | Ronge Thomas A.1, Lippold Jörg2, Geibert Walter1, Jaccard Samuel L.4, 5, Mieruch-Schnülle Sebastian1, Süfke Finn2, Tiedemann Ralf1, 3 | ||||||||||||
| Affiliation(s) | 1 : Department of Marine Geology, Alfred-Wegener-Institut Helmholtz Zentrum für Polar-und Meeresforschung, PO Box 120161, 27515, Bremerhaven, Germany 2 : Institut für Geowissenschaften, Universität Heidelberg, 69120, Heidelberg, Germany 3 : MARUM Center for Marine Environmental Sciences, Universität Bremen, 28334, Bremen, Germany 4 : Institut für Geologie & Oeschger Center for Climate Change Research, Universität Bern, 3012, Bern, Switzerland 5 : Institute of Earth Sciences, University of Lausanne, 1015, Lausanne, Switzerland |
||||||||||||
| Source | Scientific Reports (2045-2322) (Springer Science and Business Media LLC), 2021-10 , Vol. 11 , N. 1 , P. 20473 (11p.) | ||||||||||||
| DOI | 10.1038/s41598-021-00111-1 | ||||||||||||
| WOS© Times Cited | 4 | ||||||||||||
| Abstract | 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. |
||||||||||||
| Full Text |
|