Journal ArticleDOI
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
TLDR
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.Abstract:
OXYGEN isotope measurements in Greenland ice demonstrate that a series of rapid warm-cold oscillations—called Dansgaard–Oeschger events—punctuated the last glaciation1. Here we 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 events2,3. Moreover, we show that between 20 and 80 kyr ago, the shifts in ocean-atmosphere temperature are bundled into cooling cycles, lasting on average 10 to 15 kyr, with asymmetrical saw-tooth shapes. Each cycle culminated in an enormous discharge of icebergs into the North Atlantic (a 'Hein-rich event'4,5), followed by an abrupt shift to a warmer climate. These cycles document a previously unrecognized link between ice sheet behaviour and ocean–atmosphere temperature changes. An important question that remains to be resolved is whether the cycles are driven by external factors, such as orbital forcing, or by inter-nal ice-sheet dynamics.read more
Citations
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Journal ArticleDOI
Some genetic consequences of ice ages, and their role in divergence and speciation
TL;DR: The genetic effects of pleistocene ice ages are approached by deduction from paleoenvironmental information, by induction from the genetic structure of populations and species, and by their combination to infer likely consequences.
Journal ArticleDOI
Comparative phylogeography and postglacial colonization routes in Europe
TL;DR: A Brooks parsimony analysis produced an unrooted area phylogram, showing that: (i) the northern regions were colonized generally from the Iberic and Balkanic refugia; and (ii) the Italian lineages were often isolated due to the presence of the Alpine barrier.
Journal ArticleDOI
A High-Resolution Absolute-Dated Late Pleistocene Monsoon Record from Hulu Cave, China
Yongjin Wang,Yongjin Wang,Hai Cheng,Richard Lawrence Edwards,Zhisheng An,Jiangying Wu,Chuan-Chou Shen,Jeffrey A. Dorale +7 more
TL;DR: The record links North Atlantic climate with the meridional transport of heat and moisture from the warmest part of the ocean where the summer East Asian Monsoon originates and generally agrees with the timing of temperature changes from the Greenland Ice Sheet Project Two (GISP2).
Journal ArticleDOI
Comparison of oxygen isotope records from the GISP2 and GRIP Greenland ice cores
Pieter Meiert Grootes,Minze Stuiver,James W. C. White,Sigfus J Johnsen,Sigfus J Johnsen,Jean Jouzel +5 more
TL;DR: In this article, the authors present the complete oxygen isotope record for the Greenland Ice Sheet Project 2 (GISP2) core, drilled 28 km west of the GRIP core, and observe large, rapid climate fluctuations throughout the last glacial period.
Journal ArticleDOI
A new Greenland ice core chronology for the last glacial termination
Sune Olander Rasmussen,Katrine Krogh Andersen,Anders Svensson,Jørgen Peder Steffensen,Bo Møllesøe Vinther,Henrik Clausen,Marie-Louise Siggaard-Andersen,Marie-Louise Siggaard-Andersen,Sigfus J Johnsen,L. B. Larsen,Dorthe Dahl-Jensen,M. Bigler,M. Bigler,Regine Röthlisberger,Regine Röthlisberger,Hubertus Fischer,Kumiko Goto-Azuma,Margareta Hansson,Urs Ruth +18 more
TL;DR: In this paper, a new common stratigraphic timescale for the North Greenland Ice Core Project (NGRIP) and GRIP ice cores is presented, which covers the period 7.9-14.8 kyr before present and includes the Bolling, Allerod, Younger Dryas, and early Holocene periods.
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.
Journal ArticleDOI
Age dating and the orbital theory of the ice ages: Development of a high-resolution 0 to 300,000-year chronostratigraphy
Douglas G. Martinson,Nicklas G Pisias,James D. Hays,John Imbrie,Theodore C. Moore,Nicholas J Shackleton +5 more
TL;DR: Using the concept of "orbital tuning", a continuous, high-resolution deep-sea chronostratigraphy has been developed spanning the last 300,000 yr as mentioned in this paper.
Journal ArticleDOI
Origin and consequences of cyclic ice rafting in the Northeast Atlantic Ocean during the past 130,000 years
TL;DR: In this paper, the influence of Earth's orbital parameters on major ice rafting was examined using deep-sea sediment cores recovered from the Northeast Atlantic Ocean in order to elucidate the influence.
Journal ArticleDOI
Evidence for massive discharges of icebergs into the North Atlantic ocean during the last glacial period
Gerard C. Bond,Hartmut Heinrich,Wallace S. Broecker,Laurent Labeyrie,Jerry F. McManus,John T. Andrews,Sylvain Huon,Ruediger Jantschik,Silke Clasen,Christine Simet,Kathy Tedesco,Mieczyslawa Klas,Georges Bonani,Susan Ivy +13 more
TL;DR: In this article, the authors present evidence that the most recent six Heinrich layers, deposited between 14,000 and 70,000 years ago, record marked decreases in sea surface temperature and salinity, decreases in the flux of planktonic foraminifera to the sediments, and short-lived, massive discharges of icebergs originating in eastern Canada.
Journal ArticleDOI
Irregular glacial interstadials recorded in a new Greenland ice core
Sigfus J Johnsen,Sigfus J Johnsen,Henrik Clausen,Willi Dansgaard,K. Fuhrer,Niels S. Gundestrup,Claus U. Hammer,Peter Iversen,Jean Jouzel,Bernhard Stauffer,Jørgen Peder Steffensen +10 more
TL;DR: In this paper, the authors present results from a new deep ice core drilled at the summit of the Greenland ice sheet, where the depositional environ-ment and the flow pattern of the ice are close to ideal for core recovery and analysis.