Evidence for general instability of past climate from a 250-kyr ice-core record

  title={Evidence for general instability of past climate from a 250-kyr ice-core record},
  author={Willi Dansgaard and Sigfús J. Johnsen and H. B. Clausen and Dorthe Dahl-Jensen and Niels S. Gundestrup and Claus U. Hammer and Christine S. Hvidberg and J{\o}rgen Peder Steffensen and Árný E. Sveinbjörnsdóttir and Jean Jouzel and Gerard C. Bond},
RECENT results1,2 from two ice cores drilled in central Greenland have revealed large, abrupt climate changes of at least regional extent during the late stages of the last glaciation, suggesting that climate in the North Atlantic region is able to reorganize itself rapidly, perhaps even within a few decades. Here we 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… Expand
High-resolution record of Northern Hemisphere climate extending into the last interglacial period
An undisturbed climate record from a North Greenland ice core, which extends back to 123,000 years before the present, within the last interglacial period, shows a slow decline in temperatures that marked the initiation of the last glacial period. Expand
High-resolution climate records from the North Atlantic during the last interglacial
THE two deep ice cores recovered by the GRIP1 and GISP22 projects at Summit, Greenland, agree in detail over the past 100,000 years3 and demonstrate dramatic climate variability in the North AtlanticExpand
Intra-interglacial cold events: an Eemian-Holocene comparison
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Ice-core evidence for widespread Arctic glacier retreat in the Last Interglacial and the early Holocene
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Variability of the North Atlantic thermohaline circulation during the last interglacial period
Studies of natural climate variability are essential for evaluating its future evolution. Greenland ice cores suggest that the modern warm period (the Holocene) has been relatively stable for theExpand
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Three ice cores drilled to bedrock atop Nevado Coropuna, southwestern Peru reflect Holocene and late glacial stage climate variability. Two cores measure <34 m in length yet provide seeminglyExpand
The role of the deep ocean in North Atlantic climate change between 70 and 130 kyr ago
THE suggestion1 that changes in North Atlantic Deep Water (NADW) production are linked through surface heat flux to the atmospheric temperature over Greenland is supported by earlier indications2,3Expand


Irregular glacial interstadials recorded in a new Greenland ice core
THE Greenland ice sheet offers the most favourable conditions in the Northern Hemisphere for obtaining high-resolution continuous time series of climate-related parameters. Profiles of 18O/<16O ratioExpand
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Results from deep Greenland ice cores show rapid changes in several parameters in the deepest part. The most probable explanation for these variations is a fast-changing climate during part of theExpand
Late Glacial Climate History from Ice Cores
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We analyze five high-resolution time series spanning the last 1.65 m.y.: benthic foraminiferal δ18O and δ13O, percent CaCO3, and estimated sea surface temperature (SST) at North Atlantic Deep SeaExpand
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POLAR ice contains a unique record of past climate variations; previous Greenland ice cores have documented relatively warm ‘interstadial’ periods during the last glaciation and short (centuryscale)Expand
Climate instability during the last interglacial period recorded in the GRIP ice core
Isotope and chemical analyses of the GRIP ice core from Summit, central Greenland, reveal that climate in Greenland during the last interglacial period was characterized by a series of severe coldExpand
Start of a glacial
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Abstract Planktonic foraminiferal assemblages in Norwegian Sea sediments show that during the past 450,000 years a glacial regime, characterized by permanent sea-ice cover and the absence of theExpand
Continuous 500,000-Year Climate Record from Vein Calcite in Devils Hole, Nevada
Observations are inconsistent with the Milankovitch hypothesis for the origin of the Pleistocene glacial cycles but they are consistent with the thesis that these cycles originated from internal nonlinear feedbacks within the atmosphere-ice sheet-ocean system. Expand
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Digitized records of optical density in many North Atlantic cores exhibit rapid changes from lighter to darker extremes, typically within less than 200 years, at the 5d/5e, 5b/5c and 4/5 boundaries.Expand