Journal ArticleDOI
Changes in Atmospheric Circulation and Ocean Ice Cover over the North Atlantic During the Last 41,000 Years
Paul Andrew Mayewski,L. D. Meeker,Sallie I. Whitlow,Mark S. Twickler,Michael C. Morrison,Peter Bloomfield,Gerard C. Bond,Richard B. Alley,Anthony J. Gow,D. A. Meese,Pieter Meiert Grootes,Michael Ram,Kendrick C. Taylor,W. Wumkes +13 more
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TLDR
High-resolution, continuous multivariate chemical records from a central Greenland ice core provide a sensitive measure of climate change and chemical composition of the atmosphere over the last 41,000 years.Abstract:
High-resolution, continuous multivariate chemical records from a central Greenland ice core provide a sensitive measure of climate change and chemical composition of the atmosphere over the last 41,000 years. These chemical series reveal a record of change in the relative size and intensity of the circulation system that transported air masses to Greenland [defined here as the polar circulation index (PCI)] and in the extent of ocean ice cover. Massive iceberg discharge events previously defined from the marine record are correlated with notable expansions of ocean ice cover and increases in PCI. During stadials without discharge events, ocean ice cover appears to reach some common maximum level. The massive aerosol loadings and dramatic variations in ocean ice cover documented in ice cores should be included in climate modeling.read more
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Journal ArticleDOI
A Pervasive Millennial-Scale Cycle in North Atlantic Holocene and Glacial Climates
Gerard C. Bond,William J. Showers,Maziet Cheseby,Rusty Lotti,Peter Almasi,Peter B deMenocal,Paul Priore,Heidi Cullen,Irka Hajdas,Georges Bonani +9 more
TL;DR: In this paper, the North Atlantic deep sea cores reveal that abrupt shifts punctuated what is conventionally thought to have been a relatively stable Holocene climate, and they make up a series of climate shifts with a cyclicity close to 1470 ± 500 years, which is the most recent manifestation of a pervasive millennial-scale climate cycle operating independently of the glacial-interglacial climate state.
Journal ArticleDOI
Hydrological changes in the African tropics since the Last Glacial Maximum
TL;DR: Paleohydrological data from the African tropics and subtropics, including lake, groundwater and speleothem records, are reviewed to show how environments and climates from both hemispheres are inter-related.
Journal ArticleDOI
Iceberg discharges into the north atlantic on millennial time scales during the last glaciation.
Gerard C. Bond,Rusty Lotti +1 more
TL;DR: In this paper, high-resolution studies of North Atlantic deep sea cores demonstrate that prominent increases in iceberg calving recurred at intervals of 2000 to 3000 years, much more frequently than the 7000-to 10,000-year pacing of massive ice discharges associated with Heinrich events.
Journal ArticleDOI
Complexity of Holocene Climate as Reconstructed from a Greenland Ice Core
S. R. O'Brien,Paul Andrew Mayewski,L. D. Meeker,D. A. Meese,Mark S. Twickler,Sallie I. Whitlow +5 more
TL;DR: In this paper, the chemical composition of the atmosphere was dynamic during the Holocene epoch and concentrations of sea salt and terrestrial dusts increased in Summit snow during the periods 0 to 600, 2400 to 3100, 5000 to 6100, 7800 to 8800, and more than 11,300 years ago.
Journal ArticleDOI
Major features and forcing of high-latitude northern hemisphere atmospheric circulation using a 110,000-year-long glaciochemical series
Paul Andrew Mayewski,L. D. Meeker,Mark S. Twickler,Sallie I. Whitlow,Qinzhao Yang,W. Berry Lyons,Michael L. Prentice +6 more
TL;DR: The Greenland Ice Sheet Project 2 glaciochemical series (sodium, potassium, ammonium, calcium, magnesium, sulfate, nitrate, and chloride) provides a unique view of the chemistry of the atmosphere and the history of atmospheric circulation over both the high latitudes and mid-low latitudes of the northern hemisphere as discussed by the authors.
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
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.
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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
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.