Colour reflectance and descriptions of seven sediment cores from the Weddell Sea

• Main Authors: Weber, Michael E, Clark, Peter U, Ricken, Werner, Mitrovica, Jerry X, Hostetler, Steven W, Kuhn, Gerhard
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 2011
• Subjects: ANT-V/4; ANT-VI/3; ANT-VIII/5; AWI_Paleo; Gravity corer (Kiel type); Halley Bay; Lyddan Island; Paleoenvironmental Reconstructions from Marine Sediments @ AWI; Polarstern; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; PS10; PS10/778; PS12; PS12/319; PS1498-2; PS1599-3; PS16; PS16/409; PS16/410; PS16/413; PS16/417; PS16/432; PS1789-1; PS1790-1; PS1791-2; PS1793-2; PS1798-1; SL; SPP1158; Weddell Sea; Antarc*; Antarctic; Ice Sheet; North Atlantic Deep Water; North Atlantic; Sea ice
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.769686; https://doi.org/10.1594/PANGAEA.769686

The timing of the last maximum extent of the Antarctic ice sheets relative to those in the Northern Hemisphere remains poorly understood. We develop a chronology for the Weddell Sea sector of the East Antarctic Ice Sheet that, combined with ages from other Antarctic ice-sheet sectors, indicates that the advance to and retreat from their maximum extent was within dating uncertainties synchronous with most sectors of Northern Hemisphere ice sheets. Surface climate forcing of Antarctic mass balance would probably cause an opposite response, whereby a warming climate would increase accumulation but not surface melting. Our new data support teleconnections involving sea-level forcing from Northern Hemisphere ice sheets and changes in North Atlantic deep-water formation and attendant heat flux to Antarctic grounding lines to synchronize the hemispheric ice sheets.