The pattern and cause of upper‐water temperature (UWT) variations on millennial timescales in the Southern Ocean (SO) and the mechanism of their interaction with high‐latitude Northern Hemisphere climate remain unclear. Here, we reconstructed millennial‐scale subsurface temperature (subST) records from the Weddell Sea during the Last Glacial and Deglacial, combining them with subST and surface temperature records from the Antarctic and Subantarctic zones. UWTs in the SO underwent rapid changes that have covaried with Antarctic atmospheric temperatures since the Last Glacial. Rapid changes in SO UWTs were controlled by a shift of the Southern Hemisphere Westerlies through modulation of the strength of the upper‐ocean heat reservoir and upwelling of Circumpolar Deep Water. In addition to the Atlantic Meridional Overturning Circulation, the upper SO heat reservoir also played an important role in the “bipolar thermal seesaw.” Our study highlights the significance of the SO in abrupt climate changes and their interhemispheric teleconnections.
Today, the Southern Ocean (SO) is the primary sink of anthropogenic heat and carbon, yet anthropogenic warming and ozone depletion have altered its circulation and stratification, creating uncertainty about the persistence of this sink. Evidence from the last glacial period and deglaciation shows that the SO played a c...
L. Menviel, C. Buizert, Z. Chase et al.· Annual Review of Marine Scie...· 0 citations
As a gateway between the Arctic and subtropics, the subpolar North Atlantic plays a key role in large‐scale climate variability. In recent decades, the region has experienced pronounced freshening. While much attention has been paid to the expected long‐term weakening of the Atlantic Meridional Overturning Circulation,...
Holly C. Ayres, M. Oltmanns· Geophysical Research Letters· 0 citations
Sea Surface Temperature reconstructions derived from alkenone biomarker (SST-alk) reveal a cooling trend in the North Atlantic during the late Holocene (the last 5000 years), contrary to the warming simulated by transient climate models driven by 20 ppm increase in greenhouse gas concentrations. In this study, we prese...
Wei-Min Si, T. Herbert, John R. Toggweiler· Climate of the Past· 0 citations
Reconstructing past interactions between the West Antarctic Ice Sheet (WAIS) and changing environmental conditions in the Ross Sea region can help determine long‐term WAIS stability. Existing sedimentary records reveal changes to oceanography, sea ice and ice sheet extent over the glacial‐interglacial cycles of the l...
J. Marschalek, T. van de Flierdt, M. Patterson et al.· Paleoceanography and Paleocl...· 0 citations
Understanding how global climate forcing shapes regional hydroclimate on decadal to millennial timescales is critical for predicting the response of continental ice sheets to future warming. Because instrumental observations capture only a short interval, longer-term perspectives require proxy records. Here we present...
J. Faust, Yang Zhang, Andreas Born et al.· Nature Communications· 1 citation
Hydroclimate in Portugal is influenced by the North Atlantic subtropical high‐pressure system (the Azores High) and by internal climate modes, most prominently the North Atlantic Oscillation, which may shift in position and/or intensity due to anthropogenic climate change. The development of high‐resolution paleocl...
Alaina G. Chormann, A. Wanamaker, D. Thatcher et al.· Journal of Quaternary Scienc...· 0 citations
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