Precise 14 C ages of the Vedde and Saksunarvatn ashes and the Younger Dryas boundaries from western Norway and their comparison with the Greenland Ice Core (GICC05) chronology

2013 ◽  
Vol 28 (5) ◽  
pp. 490-500 ◽  
Author(s):  
ØYSTEIN S. LOHNE ◽  
JAN MANGERUD ◽  
HILARY H. BIRKS
Keyword(s):  
Ice Core ◽  
Younger Dryas ◽  
Western Norway

scholarly journals Paleomagnetic correlations between Scandinavian Ice-Sheet fluctuations and Greenland Dansgaard–Oeschger events, 45,000–25,000 yr B.P.

2003 ◽  
Vol 59 (2) ◽  
pp. 213-222 ◽  
Author(s):  
Jan Mangerud ◽  
Reidar Løvlie ◽  
Steinar Gulliksen ◽  
Anne-Karin Hufthammer ◽  
Eiliv Larsen ◽  
...  
Keyword(s):  
Continental Shelf ◽  
Time Scales ◽  
Ice Core ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Mono Lake ◽  
Western Norway ◽  
Scandinavian Ice Sheet

AbstractTwo paleomagnetic excursions, the Skjong correlated with the Laschamp (about 41,000 GISP2 yr B.P.) and the Valderhaug correlated with the Mono Lake (about 34,000 GISP2 yr B.P.), have been identified in stratigraphic superposition in laminated clay deposited in ice-dammed lakes in three large caves in western Norway. During both periods the margin of the Scandinavian Ice Sheet advanced and reached the continental shelf beyond the outermost coastline. The mild, 4000-yr-long Ålesund interstade, when the coast and probably much of the hinterland were ice-free, separated the two glacial advances. The two paleomagnetic excursions have also been indirectly identified as increased fluxes of 36Cl and 10Be in the GRIP ice core, Greenland. This article presents a correlation between ice-margin fluctuations of the Scandinavian Ice Sheet and the stratigraphy of GRIP/GISP cores, using the paleomagnetic excursions and the 36Cl and 10Be peaks and thus circumventing the application of different dates or time scales. Some of the fluctuations of the Scandinavian Ice Sheet were of the “Allerød/Younger Dryas type” in the sense that its margin retreated during mild interstades on Greenland and readvanced during cold stades. However, some fluctuations were apparently not in phase with the Greenland climate.

scholarly journals A New 14C Calibration Data Set for the Last Deglaciation Based on Marine Varves

Radiocarbon ◽  
1997 ◽  
Vol 40 (1) ◽  
pp. 483-494 ◽  
Author(s):  
Konrad A. Hughen ◽  
Jonathan T. Overpeck ◽  
Scott J. Lehman ◽  
Michaele Kashgarian ◽  
John R. Southon ◽  
...  
Keyword(s):  
Global Climate ◽  
Ice Core ◽  
Younger Dryas ◽  
Core Layer ◽  
Cariaco Basin ◽  
Calibration Data ◽  
Last Deglaciation ◽  
Data Set ◽  
The Last Deglaciation ◽  
Calibration Data Set

Varved sediments of the tropical Cariaco Basin provide a new 14C calibration data set for the period of deglaciation (10,000 to 14,500 years before present: 10–14.5 cal ka bp). Independent evaluations of the Cariaco Basin calendar and 14C chronologies were based on the agreement of varve ages with the GISP2 ice core layer chronology for similar high-resolution paleoclimate records, in addition to 14C age agreement with terrestrial 14C dates, even during large climatic changes. These assessments indicate that the Cariaco Basin 14C reservoir age remained stable throughout the Younger Dryas and late Allerød climatic events and that the varve and 14C chronologies provide an accurate alternative to existing calibrations based on coral U/Th dates. The Cariaco Basin calibration generally agrees with coral-derived calibrations but is more continuous and resolves century-scale details of 14C change not seen in the coral records. 14C plateaus can be identified at 9.6, 11.4, and 11.7 14C ka bp, in addition to a large, sloping “plateau” during the Younger Dryas (∼10 to 11 14C ka bp). Accounting for features such as these is crucial to determining the relative timing and rates of change during abrupt global climate changes of the last deglaciation.

scholarly journals Tree-ring radiocarbon reveals reduced solar activity during Younger Dryas cooling

2020 ◽  
Author(s):  
Adam Sookdeo ◽  
Bernd Kromer ◽  
Florian Adolphi ◽  
Jürg Beer ◽  
Nicolas Brehm ◽  
...  
Keyword(s):  
Solar Activity ◽  
Tree Ring ◽  
North Atlantic ◽  
Little Ice Age ◽  
Ice Core ◽  
Younger Dryas ◽  
Ice Age ◽  
The North ◽  
Long Duration ◽  
Clear Sign

<p>The Younger Dryas stadial (YD) was a return to glacial-like conditions in the North Atlantic region that interrupted deglacial warming around 12900 cal BP (before 1950 AD). Terrestrial and marine records suggest this event was initiated by the interruption of deep-water formation arising from North American freshwater runoff, but the causes of the millennia-long duration remain unclear. To investigate the solar activity, a possible YD driver, we exploit the cosmic production signals of tree-ring radiocarbon (<sup>14</sup>C) and ice-core beryllium-10 (<sup>10</sup>Be). Here we present the highest temporally resolved dataset of <sup>14</sup>C measurements (n = 1558) derived from European tree rings that have been accurately extended back to 14226 cal BP (±8, 2-σ), allowing precise alignment of ice-core records across this period. We identify a substantial increase in <sup>14</sup>C and <sup>10</sup>Be production starting at 12780 cal BP is comparable in magnitude to the historic Little Ice Age, being a clear sign of grand solar minima. We hypothesize the timing of the grand solar minima provides a significant amplifying factor leading to the harsh sustained glacial-like conditions seen in the YD.</p>

scholarly journals Changes Of Atmospheric Methane Concentration Parallel To Climatic Changes

1990 ◽  
Vol 14 ◽  
pp. 359-359
Author(s):  
B. Stauffer ◽  
H. Oeschger ◽  
J. Schwander
Keyword(s):  
Climatic Change ◽  
Methane Concentration ◽  
Ice Core ◽  
Younger Dryas ◽  
Climatic Changes ◽  
Atmospheric Methane ◽  
Sources And Sinks ◽  
Core Samples ◽  
Climatic Optimum ◽  
Present Understanding

Measurements on ice-core samples showed that atmospheric methane concentration changed with the large climatic cycles during the last two glaciations (Stauffer and others, 1988; Raynaud and others, 1988). The methane concentration is lower in cold periods and higher in warm periods. In this paper we discuss the results of CH4 measurements of samples from periods of minor climatic change, like the climatic optimum 8000 years B.P. and the Younger Dryas period about 10 000 to 11 000 years B.P.. The data are interpreted in terms of the present understanding of methane sources and sinks.

scholarly journals Changes Of Atmospheric Methane Concentration Parallel To Climatic Changes

1990 ◽  
Vol 14 ◽  
pp. 359
Author(s):  
B. Stauffer ◽  
H. Oeschger ◽  
J. Schwander
Keyword(s):  
Climatic Change ◽  
Methane Concentration ◽  
Ice Core ◽  
Younger Dryas ◽  
Climatic Changes ◽  
Atmospheric Methane ◽  
Sources And Sinks ◽  
Core Samples ◽  
Climatic Optimum ◽  
Present Understanding

Measurements on ice-core samples showed that atmospheric methane concentration changed with the large climatic cycles during the last two glaciations (Stauffer and others, 1988; Raynaud and others, 1988). The methane concentration is lower in cold periods and higher in warm periods. In this paper we discuss the results of CH4 measurements of samples from periods of minor climatic change, like the climatic optimum 8000 years B.P. and the Younger Dryas period about 10 000 to 11 000 years B.P.. The data are interpreted in terms of the present understanding of methane sources and sinks.

Allerod-Younger Dryas Climatic Inferences from Cirque Glaciers and Vegetational Development in the Nordfjord Area, Western Norway

1984 ◽  
Vol 16 (2) ◽  
pp. 137 ◽  
Author(s):  
Eiliv Larsen ◽  
Froydis Eide ◽  
Oddvar Longva ◽  
Jan Mangerud
Keyword(s):  
Younger Dryas ◽  
Western Norway

scholarly journals Younger Dryas ice-margin retreat in Greenland, new evidence from Southwest Greenland

2020 ◽  
Author(s):  
Svend Funder ◽  
Anita H. L. Sørensen ◽  
Nicolaj K. Larsen ◽  
Anders Bjørk ◽  
Jason P. Briner ◽  
...  
Keyword(s):  
Ice Core ◽  
Temperature Drop ◽  
Younger Dryas ◽  
Greenland Ice Sheet ◽  
Subsurface Water ◽  
Glacier Mass Balance ◽  
Sea Ice Extent ◽  
The Rich ◽  
Temperature Records ◽  
Southwest Greenland

Abstract. Cosmogenic 10Be dates from bedrock knobs on six outlying tiny islands along a stretch of 300 km of the Southwest Greenland coast, indicate that the Greenland Ice Sheet (GrIS) margin here was retreating on the inner shelf close to the coast during the Younger Dryas (YD) cold period. A survey of recently published 10Be and 14C-dated records show that this unexpected behaviour of the ice-margin has been seen also in other parts of Greenland, but with very large variations in extent and speed of retreat even between neighbouring areas. In contrast to this, landforms appearing in high resolution bathymetry surveys on the shelf, have recently been suggested to indicate YD readvance or long-lasting ice-margin still stand on mid shelf, far from the coast. However, these features have been dated primarily by correlation with cold periods in the ice core temperature records, and therefore cannot inform about the ice-margin/climate relation. Ice-margin retreat during a YD cooling has been explained by advection of warm subsurface water melting the ice-margin, and by increased seasonality of the climate with the temperature drop mainly in winter, with high impact on sea ice extent and duration, but little effect on glacier mass balance. This study therefore adds to the complexity of the climate/ice-margin relation, where local factors may for some time overrule or mute overall temperature change. It also points to the urgent need for climate-independent dating of the rich treasure trove of information coming from the shelf in these years.

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