Glacial to deglacial reservoir ages of surface waters in the southern South Pacific
| Type | Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Date | 2020-08-11 | ||||||||
| Language | English | ||||||||
| Author(s) | Küssner Kevin1, Sarnthein Michael 2, Lamy Frank1, Michel Elisabeth3, Mollenhauer Gesine1, Ronge Thomas Alexander1, Siani Giuseppe4, Tiedemann Ralf1 |
||||||||
| Affiliation(s) | 1 : Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Department for Marine Geology, 27570 Bremerhaven, Germany 2 : Institute of Geosciences, University of Kiel, Olshausenstr. 40, 24098 Kiel, Germany 3 : LSCE-IPSL, CNRS-CEA-UVSQ Bât 714, L'Orme des Merisiers, 91191 Gif-sur-Yvette Cedex, France 4 : Laboratoire GEOPS UMR 8148, CNRS-Université Paris Saclay, Département des Sciences de la Terre, Bât. 504 (RdC), 91405 ORSAY Cedex, France |
||||||||
| Source | ESS Open Archive (Wiley), 2020-08-11 , P. 54p. | ||||||||
| DOI | 10.1002/essoar.10503934.1 | ||||||||
| Note | This is a preprint and has not been peer reviewed. Data may be preliminary. | ||||||||
| Keyword(s) | hydrology, oceanography, surface waters | ||||||||
| Abstract | Ocean sediment records document abrupt changes in glacial-to-deglacial circulation and mixing of the ocean, recorded as changes in 14C reservoir ages of surface waters. Here we present 14C-based high-resolution age records of four sediment cores derived by means of 14C plateau tuning. This provides a detailed and precise stratigraphic correlation between the western and eastern South Pacific and paleoclimate records of Antarctic ice cores as well as 14C reservoir ages. The accuracy and precision of plateau tuning are confirmed in two sediment cores off Chile; in one core by independent land-based age control of four tephra layers, in a second core by a suite of glacial sediment varves. During glacial times, high reservoir ages reaching up to ~1500 yr may reflect seasonal sea ice and/or a melt water lid at high latitudes both east of New Zealand and off southern Chile and may be linked to northward advection of upwelled old subsurface waters from the Polar Frontal Zone. Our results support the model of a bipolar seesaw at the onset of rapid deglacial Antarctic warming, moreover, they show that the Antarctic Cold Reversal immediately preceded the onset of the Younger Dryas cold spell. |
||||||||
| Full Text |
|