Journal ArticleDOI
A regional 8200 cal. yr BP cooling event in northwest Europe, induced by final stages of the Laurentide ice-sheet deglaciation?
Dorthe Klitgaard-Kristensen,Hans Petter Sejrup,Haflidi Haflidason,Sigfus J Johnsen,Marco Spurk +4 more
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TLDR
The most notable change in δ18O in Greenland ice cores during the Holocene occurs at 8200 cal. yr BP as mentioned in this paper, and the synchronous timing of the cooling event in the Greenland ice-cores, marine record and tree-ring data from northwest Europe reflects a regional influence on the North Atlantic ocean-atmospheric system, suggesting a prominent role of the NorthAtlantic thermohaline circulation.Abstract:
The most notable change in δ18O in Greenland ice cores during the Holocene occurs at 8200 cal. yr BP. Here we present a new high-resolution marine record from the northern North Sea, along with tree-ring data from Germany, which contain evidence of a pronounced temperature drop (>2°C) contemporaneous with that of the Greenland ice-core records. The synchronous timing of the cooling event in the Greenland ice-cores, marine record and tree-ring data from northwest Europe reflects a regional influence on the North Atlantic ocean–atmospheric system, suggesting a prominent role of the North Atlantic thermohaline circulation. The operation of the North Atlantic ocean circulation is sensitive to variation in the freshwater budget, implying that any change in freshwater flux is capable of altering the North Atlantic circulation system. We hypothesise minor but long-term freshwater fluxes in the final stages of the deglaciation of the Laurentide ice-sheet as a forcing mechanism. © 1998 John Wiley & Sons, Ltd.read more
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Journal ArticleDOI
Forcing of the cold event of 8,200 years ago by catastrophic drainage of Laurentide lakes
Donald C. Barber,Arthur S. Dyke,Claude Hillaire-Marcel,Anne E. Jennings,John T. Andrews,M. W. Kerwin,G Bilodeau,Roger McNeely,John R. Southon,Mark D. Morehead,Jean-Marc Gagnon +10 more
TL;DR: In this article, the authors argue that this cooling event was forced by a massive outflow of fresh water from the Hudson Strait, based on the estimates of the marine 14C reservoir for Hudson Bay which, in combination with other regional data, indicate that the glacial lakes Agassiz and Ojibway (originally dammed by a remnant of the Laurentide ice sheet) drained catastrophically ∼8,470 calendar years ago; this would have released >1014 m3 of freshwater into the Labrador Sea.
Journal ArticleDOI
The 8k event: cause and consequences of a major Holocene abrupt climate change
TL;DR: A prominent, abrupt climate event about 8200 years ago brought generally cold and dry conditions to broad northern-hemisphere regions especially in wintertime, in response to a very large outburst flood that freshened the North Atlantic.
Journal ArticleDOI
A mid-european decadal isotope-climate record from 15,500 to 5000 years B.P
TL;DR: Oxygen-isotope ratios of precipitation inferred from deep-lake ostracods from the Ammersee provide a climate record with decadal resolution that indicates that climate gradients between Europe and Greenland changed systematically, reflecting a gradual rearrangement of North Atlantic circulation during deglaciation.
Journal ArticleDOI
Centennial-Scale Holocene Climate Variability Revealed by a High-Resolution Speleothem δ18O Record from SW Ireland
TL;DR: Evidence for previously undetected early Holocene cooling events is presented, but mid- to late-Holocene ice rafting in the North Atlantic appears to have had little impact on δ18O at this ocean margin site.
Journal ArticleDOI
Paleohydraulics of the last outburst flood from glacial Lake Agassiz and the 8200 BP cold event
TL;DR: This article used the Spring-Hutter theory to simulate flood hydrographs for floods that originate in subglacial drainage conduits and found that flood magnitude and duration are ∼5 Sv and ∼0.5 yr.
References
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Journal ArticleDOI
Evidence for general instability of past climate from a 250-kyr ice-core record
Willi Dansgaard,Sigfus J Johnsen,Sigfus J Johnsen,Henrik Clausen,Dorthe Dahl-Jensen,Niels S. Gundestrup,Claus U. Hammer,Christine S. Hvidberg,Jørgen Peder Steffensen,Arny E. Sveinbjörnsdottir,Jean Jouzel,Gerard C. Bond +11 more
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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Correlations between climate records from North Atlantic sediments and Greenland ice
Gerard C. Bond,Wallace S. Broecker,Sigfus J Johnsen,Sigfus J Johnsen,Jerry F. McManus,Laurent Labeyrie,Jean Jouzel,Jean Jouzel,Georges Bonani +8 more
TL;DR: In this article, the authors present records of sea surface temperature from North Atlantic sediments spanning the past 90 kyr which contain a series of rapid temperature oscillations closely matching those in the ice-core record, confirming predictions that the ocean must bear the imprint of the Dansgaard-Oeschger events.
Journal ArticleDOI
Holocene climatic instability: A prominent, widespread event 8200 yr ago
Richard B. Alley,Paul Andrew Mayewski,Todd Sowers,Minze Stuiver,Kendrick C. Taylor,Peter U. Clark +5 more
TL;DR: The most prominent Holocene climatic event in Greenland ice-core proxies, with approximately half the amplitude of the Younger Dryas, occurred ∼8000 to 8400 yr ago.
Journal ArticleDOI
The Great Ocean Conveyor
TL;DR: The ocean's conveyor appears to be driven by the salt left behind as the result of water-vapor transport through the atmosphere from the Atlantic to the Pacific basin this paper.
Journal ArticleDOI
Modeling Atmospheric 14C Influences and 14C Ages of Marine Samples to 10,000 BC
TL;DR: The detailed radiocarbon age vs. calibrated (cal) age studies of tree rings reported in this article provide a unique data set for precise 14C age calibration of materials formed in isotopic equilibrium with atmospheric CO2.