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Interhemispheric Atlantic seesaw response during the last deglaciation
New records from the South Atlantic are presented that show rapid changes during the last deglaciation that were instantaneous (within dating uncertainty) and of opposite sign to those observed in the North Atlantic.
Foraminiferal Calcification Response to Glacial-Interglacial Changes in Atmospheric CO2
The results support suggestions that higher atmospheric carbon dioxide directly affects marine calcification, an effect that may be of global importance to past and future changes in atmospheric CO2.
Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum
The Geological Record of Ocean Acidification
The geological record contains long-term evidence for a variety of global environmental perturbations, including ocean acidification plus their associated biotic responses, over the past ~300 million years of Earth’s history.
A 190‰ drop in atmosphere's Δ14C during the “Mystery Interval” (17.5 to 14.5 kyr)
Icebergs not the trigger for North Atlantic cold events
- S. Barker, James Chen, X. Gong, L. Jonkers, G. Knorr, D. Thornalley
- Environmental Science, GeographyNature
- 16 April 2015
A systematic delay between pronounced surface cooling and the arrival of ice-rafted debris at a site southwest of Iceland over the past four glacial cycles is demonstrated, implying that in general icebergs arrived too late to have triggered cooling, and is suggested thatrupt transitions to stadial conditions should be considered as a nonlinear response to more gradual cooling across the North Atlantic.
A record of bottom water temperature and seawater δ18O for the Southern Ocean over the past 440 kyr based on Mg/Ca of benthic foraminiferal Uvigerina spp
800,000 Years of Abrupt Climate Variability
An 800,000-year synthetic record of Greenland climate variability based on the thermal bipolar seesaw model provides evidence for a ubiquitous association betweenipolar seesaw oscillations and glacial terminations throughout the Middle to Late Pleistocene.
The Deglacial Evolution of North Atlantic Deep Convection
- D. Thornalley, S. Barker, W. Broecker, H. Elderfield, I. McCave
- Environmental ScienceScience
- 14 January 2011
It is suggested that, despite a strong control on Greenland temperature by northeast Atlantic convection, reduced open-ocean convection in both the northwest and northeast Atlantic is necessary to account for contemporaneous perturbations in atmospheric circulation.
Development of Middle Stone Age innovation linked to rapid climate change
- M. Ziegler, M. Simon, I. Hall, S. Barker, C. Stringer, R. Zahn
- Environmental Science, GeographyNature communications
- 21 May 2013
It is shown that the occurrence of innovation was tightly linked to abrupt climate change, which strongly implies that innovational pulses of early modern human behaviour were climatically influenced and linked to the adoption of refugia.