FN Archimer Export Format
PT J
TI Migration of the Antarctic Polar Front over the last glacial cycle
BT 
AF Thöle, Lena
   Ai, Xuyuan
   Auderset, Alexandra
   Schmitt, Mareike
   Moretti, Simone
   Studer, Anja
   Michel, Elisabeth
   Wegmann, Martin
   Mazaud, Alain
   Bijl, Peter
   Sigman, Daniel
   Martinez-Garcia, Alfredo
   Jaccard, Samuel L.
AS 1:1,2,3;2:2,4;3:2;4:2;5:2;6:2,5;7:6;8:7;9:6;10:3;11:4;12:2;13:1,8;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;
C1 Institute of Geological Sciences and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland
   Max Planck Institute for Chemistry, Climate Geochemistry Department, Mainz, Germany
   Marine Palynology and Paleoceanography, Department of Earth Sciences, Utrecht University, The Netherlands
   Department of Geosciences, Princeton University, Princeton, NJ, USA
   Aquatic and Isotope Biogeochemistry, Department of Environmental Sciences, University of Basel, Switzerland
   Laboratoire de Sciences et de l’Environnement (LSCE), Gif-sur-Yvette, France
   Institute of Geography and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland.
   Institute of Earth Sciences, University of Lausanne, Lausanne, Switzerland
C2 UNIV BERN, SWITZERLAND
   MAX PLANCK INST CHEM, GERMANY
   UNIV UTRECHT, NETHERLANDS
   UNIV PRINCETON, USA
   UNIV BASEL, SWITZERLAND
   LSCE, FRANCE
   UNIV BERN, SWITZERLAND
   UNIV LAUSANNE, SWITZERLAND
TC 0
UR https://archimer.ifremer.fr/doc/00847/95938/103885.pdf
LA English
DT Article
CR MD 185 / INDIEN SUD 1
BO Marion Dufresne
DE ;Paleoceanography;glacial–interglacial changes;Southern Ocean;ACC;atmospheric CO2
AB The Southern Hemisphere Westerly Winds (SWW) drive upwelling south of the Antarctic Polar Front (PF) that vents CO2 to the atmosphere. During the ice ages, a northward (equatorward) shift of the PF may have reduced this CO2 venting, helping to explain the lower atmospheric CO2 concentration of those times. However, evidence of PF migration is lacking. Here, we report biomarker–based sea surface temperature (SST) reconstructions from two marine sediment cores at different latitudes in the Southern Indian Ocean across the last glacial cycle. Using a quantitative framework for the effect of the PF on meridional SST gradient, we show that the PF underwent an equatorward shift during the ice ages. The PF latitude reconstruction, when compared with other data, also suggests a role for Earth’s axial tilt in the strength and latitude range of SWW-driven upwelling, which may explain previously noted deviations in atmospheric CO2 from a simple correlation with Antarctic climate. 
PY 2022
PD MAR
SO Research Square.
PU Research Square Platform LLC
IS Version 1
DI 10.21203/rs.3.rs-1364006/v1
ID 95938
ER

EF