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… 

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 Atlantic

Intra-interglacial cold events: an Eemian-Holocene comparison

Abstract Rapid oscillations between warm and cold climates have been found in the oxygen isotope record of the Greenland Ice-core Project (GRIP) ice core during the Eemian/Marine oxygen Isotope Stage

Ice-core evidence for widespread Arctic glacier retreat in the Last Interglacial and the early Holocene

Abstract An early study of the various components of the Greenland, Antarctic and Canadian Arctic ice-cap cores (Koerner, 1989) suggested that during the last interglacial period, the Greenland ice

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 the

Contrasting atmospheric and climate dynamics of the last-glacial and Holocene periods

OUR present climate is relatively stable compared to that of the Last Glacial Maximum about 20,000 years ago. Palaeoclimate records obtained from ice cores1,2 and deep-sea sediment cores3 for the

Abrupt Holocene climate change: Evidence from a new suite of ice cores from Nevado Coropuna, southwestern Peru and recently exposed vegetation from the Quelccaya Ice Cap, southeastern Peru

  • A. Buffen
  • Environmental Science, Geography
  • 2008
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 seemingly

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 indications2,3



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 ratio

A Detailed Analysis of the Rapid Changes in Ice-Core Parameters During the last Ice Age

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 the

Late Glacial Climate History from Ice Cores

Ice cores contain information on climatic variations and their causes. Recent results obtained on the new deep ice core drilled in 1981 at Dye 3, South Greenland, in the frame of the US-Danish-Swiss

The ‘flickering switch’ of late Pleistocene climate change

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)

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 cold

Start of a glacial

Interglacial-glacial transitions.- How accurate are the U-Th ages obtained by mass spectrometry on coral terraces?.- Transitions from interglacial to glacial in the pollen record from Valle Di

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.

Abrupt Color Changes in Isotope Stage 5 in North Atlantic Deep Sea Cores: Implications for Rapid Change of Climate-Driven Events

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.

Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust

Abstract The available methods for dating of ice cores are based on radioactive decay, ice-flow calculations, or stratigraphic observations. The two former categories are broadly outlined, and