Extent and variability of the meridional Atlantic circulation in the eastern Nordic seas during Marine Isotope Stage 5 and its influence on the inception of the last glacial

2005 ◽  
pp. 323-339 ◽  
Author(s):  
Bjørg Risebrobakken ◽  
Trond Dokken ◽  
Eystein Jansen
Keyword(s):  
Marine Isotope Stage ◽  
Nordic Seas ◽  
Last Glacial ◽  
Marine Isotope Stage 5 ◽  
The Last Glacial

scholarly journals Tephra horizons identified in the western North Atlantic and Nordic Seas during the Last Glacial Period: Extending the marine tephra framework

2020 ◽  
Vol 240 ◽  
pp. 106247
Author(s):  
Sunniva Rutledal ◽  
Sarah M.P. Berben ◽  
Trond M. Dokken ◽  
Willem G.M. van der Bilt ◽  
Jan Magne Cederstrøm ◽  
...  
Keyword(s):  
North Atlantic ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Nordic Seas ◽  
Last Glacial ◽  
The Last Glacial

Geomorphological, chronological, and paleoenvironmental context of the Mousterian site at Roca San Miguel (Arén, Huesca, Spain) from the penultimate to the last glacial cycle

2021 ◽  
pp. 1-20
Author(s):  
José Luis Peña-Monné ◽  
Lourdes Montes Ramírez ◽  
María Marta Sampietro-Vattuone ◽  
Rafael Domingo Martínez ◽  
Alicia Medialdea ◽  
...  
Keyword(s):  
Evolutionary Model ◽  
Archaeological Site ◽  
Optically Stimulated Luminescence ◽  
Marine Isotope Stage ◽  
Paleoenvironmental Reconstruction ◽  
Glacial Period ◽  
Glacial Cycle ◽  
Last Glacial ◽  
The Last Glacial

Abstract The Roca San Miguel (RSM) archaeological site was occupied during Mousterian times. Here we present a geoarchaeological and paleoenvironmental reconstruction of the site. Five stratigraphic units (A to E) formed by different archaeological levels are identified. Three optically stimulated luminescence (OSL) ages show that Unit A dates to between 169.6 ± 9.1 and 151.9 ± 11.1 ka, during the penultimate glacial period (PGP), and contains numerous signs of recurring hearths. Unit B is unexcavated. Unit C dates to between 118.9 ± 11.5 and 103.4 ± 6.9 ka (late Eemian–marine isotope stage (MIS) 5d) and shows an abundance of lithic remains as well as some faunal elements. Unit C is covered by Unit D, which incorporates materials moved downslope, and is dated at 81.2 ± 4.7 ka. These OSL ages concur with U/Th ages (129.3 ± 1.5 and 123.6 ± 0.6 ka) derived from a flowstone covered by both -C and D- post-flowstone units. Finally, Unit E covers the archaeological site, which was partially eroded during MIS2. The robust and well-constrained chronology of the RSM site and surroundings enables the establishment of its evolutionary model from the PGP to the last glacial cycle. The RSM site is the oldest Neanderthal occupation accurately dated in the Pre-Pyrenean region.

scholarly journals Causes and consequences of Arctic freshwater routing into the Nordic Seas during late Marine Isotope Stage 5

2018 ◽  
Vol 33 (8) ◽  
pp. 977-977
Author(s):  
Maciej M. Telesiński ◽  
Henning A. Bauch ◽  
Robert F. Spielhagen
Keyword(s):  
Marine Isotope Stage ◽  
Nordic Seas ◽  
Marine Isotope Stage 5

scholarly journals Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3) – New evidence from Rauer Group

2016 ◽  
Vol 153 ◽  
pp. 1-10 ◽  
Author(s):  
Sonja Berg ◽  
Duanne A. White ◽  
Ole Bennike ◽  
Réka-H. Fülöp ◽  
David Fink ◽  
...  
Keyword(s):  
East Antarctica ◽  
Marine Isotope Stage ◽  
Last Glacial ◽  
Marine Isotope Stage 3 ◽  
New Evidence ◽  
The Last Glacial

A Heuristic Model of Dansgaard–Oeschger Cycles. Part I: Description, Results, and Sensitivity Studies

2014 ◽  
Vol 27 (12) ◽  
pp. 4337-4358 ◽  
Author(s):  
Hansi A. Singh ◽  
David S. Battisti ◽  
Cecilia M. Bitz
Keyword(s):  
Sea Ice ◽  
Large Scale ◽  
Oscillatory Behavior ◽  
Meridional Overturning Circulation ◽  
Heuristic Model ◽  
Overturning Circulation ◽  
Nordic Seas ◽  
Last Glacial ◽  
Sensitivity Studies ◽  
The Last Glacial

Abstract A simple model for studying the Dansgaard–Oeschger (D-O) cycles of the last glacial period is presented, based on the T. Dokken et al. hypothesis for D-O cycles. The model is a column model representing the Nordic seas and is composed of ocean boxes stacked below a one-layer sea ice model with an energy-balance atmosphere; no changes in the large-scale ocean overturning circulation are invoked. Parameterizations are included for latent heat polynyas and sea ice export from the column. The resulting heuristic model was found to cycle between stadial and interstadial states at times scales similar to those seen in the proxy observational data, with the presence or absence of perennial sea ice in the Nordic seas being the defining characteristic for each of these states. The major discrepancy between the modeled oscillations and the proxy record is in the length of the interstadial phase, which is shorter than that observed. The modeled oscillations were found to be robust to parameter changes, including those related to the ocean heat flux convergence (OHFC) into the column. Production of polynya ice was found to be an essential ingredient for such sustained oscillatory behavior. A simple parameterization of natural variability in the OHFC enhances the robustness of the modeled oscillations. The authors conclude by discussing the implications of such a hypothesis for the state of the Nordic seas today and its state during the Last Glacial Maximum and contrasting the model to other hypotheses that invoke large-scale changes in the Atlantic meridional overturning circulation for explaining millennial-scale variability in the climate system. An extensive time-scale analysis will be presented in the future.

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