Phase relationships between millennial-scale events 64,000–24,000 years ago
TL;DR: In this paper, a core recovered on the Iberian margin off southern Portugal can be correlated with Greenland ice cores using oxygen isotope variability in planktonic foraminifera which closely matches the ice core records of temperature over Greenland.
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Abstract: A core recovered on the Iberian margin off southern Portugal can be correlated with Greenland ice cores using oxygen isotope variability in planktonic foraminifera which closely matches the ice core records of temperature over Greenland. Our age model identifies the base of every interstadial between 64,000 and 24,000 years ago and uses the Greenland Ice Core Project (GRIP) timescale. The oxygen isotope signal in benthic foraminifera (on this GRIP-based timescale) is quite different from the planktonic record and resembles the temperature record over Antarctica when this is synchronized with Greenland using the record of methane in the atmospheric air in the polar ice cores. We interpret the benthic record as indicating significant fluctuations in ice volume during millennial events, and we suggest that Antarctic temperature changed as a function of ice volume.
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Climatic and oceanographic changes in the Northeast Atlantic reflected by magnetic properties of sediments deposited on the Portuguese Margin during the last 340 ka
TL;DR: In this paper, the authors measured along two giant piston cores, MD95-2040 (40°34′N, 9°51′W) and MD95 −2042 (37°47′N and 10°09′W), collected off the Portuguese Margin, related to other proxy-climatic data, have been used to reconstruct magnetic mineralogical changes of, in relation to environmental and climatic conditions over the North Atlantic, Western Europe and Northwest Africa during the last three climatic cycles (since isotope stage 10).
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Rapid switches in subpolar North Atlantic hydrography and climate during the Last Interglacial (MIS 5e)
Nil Irvali,Ulysses S Ninnemann,Eirik Vinje Galaasen,Yair Rosenthal,Dick Kroon,Delia W Oppo,Helga F Kleiven,Kathryn Darling,Catherine Kissel +8 more
TL;DR: The authors suggest that switches in the subpolar gyre hydrography occurred during a warmer climate, involving regional changes in freshwater fluxes/balance and East Greenland Current influence in the study area.
Abrupt changes in deep Atlantic circulation during the transition to full glacial conditions
David Thornalley,David Thornalley,Stephen Barker,Julia Becker,Julia Becker,Ian Hall,Gregor Knorr +6 more
TL;DR: In this paper, silt mean grain size measurements are employed to examine changes in near bottom flow speeds, together with carbon isotopes measured in benthic foraminifera and % planktic foraminiferal fragmentation as proxies for changes in water-mass chemistry.
Climate change, not human population growth, correlates with Late Quaternary megafauna declines in North America
TL;DR: Radiocarbon-dated Event-Count (REC) Modelling is employed to test whether declines in North American megafauna species could be best explained by climate changes, increases in human population densities, or both, using the largest available database ofmegafauna and human radiocarbon dates.
Ice‐free conditions in Sweden during Marine Oxygen Isotope Stage 3?
TL;DR: Wohlfarth et al. as mentioned in this paper evaluated and evaluated 14C dates for Sweden older than the Last Glacial Maximum ice advance and found that central and northern Sweden was ice free during the early and middle part of Marine Oxygen Isotope Stage 3 and that southern Sweden remained ice-free until c. 25 cal. kyr BP.
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TL;DR: In this paper, the authors present a detailed stable isotope record for the full length of the Greenland Ice-core Project Summit ice core, extending over the past 250 kyr according to a calculated timescale, and find that climate instability was not confined to the last glaciation, but appears also have been marked during the last interglacial (as explored more fully in a companion paper), and during the previous Saale-Holstein glacial cycle.
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Oxygen isotope and palaeomagnetic stratigraphy of Equatorial Pacific core V28-238: Oxygen isotope temperatures and ice volumes on a 105 year and 106 year scale☆
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Irregular glacial interstadials recorded in a new Greenland ice core
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TL;DR: In this paper, the authors present results from a new deep ice core drilled at the summit of the Greenland ice sheet, where the depositional environ-ment and the flow pattern of the ice are close to ideal for core recovery and analysis.
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Major features and forcing of high-latitude northern hemisphere atmospheric circulation using a 110,000-year-long glaciochemical series
Paul Andrew Mayewski,L. D. Meeker,Mark S. Twickler,Sallie I. Whitlow,Qinzhao Yang,W. Berry Lyons,Michael L. Prentice +6 more
TL;DR: The Greenland Ice Sheet Project 2 glaciochemical series (sodium, potassium, ammonium, calcium, magnesium, sulfate, nitrate, and chloride) provides a unique view of the chemistry of the atmosphere and the history of atmospheric circulation over both the high latitudes and mid-low latitudes of the northern hemisphere as discussed by the authors.
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