North Atlantic ocean circulation and abrupt climate change during the last glaciation.
L. G. Henry,Jerry F. McManus,William B Curry,William B Curry,Natalie L Roberts,Alexander M Piotrowski,Lloyd D Keigwin +6 more
TL;DR: Climate and ocean circulation proxies are examined at high resolution in a deep North Atlantic sediment core, suggesting reduced Atlantic overturning circulation during every cool northern stadial, with the greatest reductions during episodic Hudson Strait iceberg discharges, while sharp northern warming followed reinvigorated overturning.
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Abstract: The most recent ice age was characterized by rapid and hemispherically asynchronous climate oscillations, whose origin remains unresolved. Variations in oceanic meridional heat transport may contribute to these repeated climate changes, which were most pronounced during marine isotope stage 3, the glacial interval 25 thousand to 60 thousand years ago. We examined climate and ocean circulation proxies throughout this interval at high resolution in a deep North Atlantic sediment core, combining the kinematic tracer protactinium/thorium (Pa/Th) with the deep water-mass tracer, epibenthic δ13C. These indicators suggest reduced Atlantic overturning circulation during every cool northern stadial, with the greatest reductions during episodic Hudson Strait iceberg discharges, while sharp northern warming followed reinvigorated overturning. These results provide direct evidence for the ocean’s persistent, central role in abrupt glacial climate change.
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Francesco Muschitiello
- 07 Nov 2023
TL;DR: The new transfer function quantifies the age difference between GICC05 and U-Th timescale during the last glacial period and significantly reduces dating uncertainty.
Deeper and stronger North Atlantic Gyre during the Last Glacial Maximum
Jack Wharton,Martin Renoult,Geoffrey Gebbie,Lloyd D Keigwin,Thomas M. Marchitto,Mark Maslin,Delia W Oppo,David Thornalley +7 more
TL;DR: During the Last Glacial Maximum, the North Atlantic Gyre strengthened and deepened due to increased wind stress curl and surface buoyancy forcing, influencing global ocean circulation and climate patterns.
A Highly Resolved Speleothem δ13C Record from Central China and Its Manifestation on Multiple Time Scales during the Last Glacial
Qingmin Chen,Xin-Rong Cheng,Kaikai He,Wenshuo Zhang,Gang Xue,Zeke Zhang,Le Ma,Gaohong Wang,Hai Cheng,R. Edwards +9 more
TL;DR: Speleothem δ13C records from central China reflect local hydroclimatic changes and are controlled by regional hydrological conditions.
A new approach for simulating the paleo evolution of the Northern Hemisphere ice sheets
Rubén Banderas,Jorge Alvarez-Solas,Alexander Robinson,Marisa Montoya +3 more
TL;DR: Researchers develop a new approach to simulate Northern Hemisphere ice sheet evolution, improving representation of orbital and millennial-scale climate variability, and reducing overestimation of temperature variability, resulting in more realistic ice sheet configurations.
References
Evidence for general instability of past climate from a 250-kyr ice-core record
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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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High-resolution record of Northern Hemisphere climate extending into the last interglacial period.
Katrine Krogh Andersen,Nobuhiko Azuma,Jean-Marc Barnola,M. Bigler,Pierre E. Biscaye,Nicolas Caillon,Jérôme Chappellaz,H. B. Clausen,Dorthe Dahl-Jensen,Hubertus Fischer,Jacqueline Flückiger,Diedrich Fritzsche,Yoshiyuki Fujii,Kumiko Goto-Azuma,Karl Grönvold,Niels S. Gundestrup,Margareta Hansson,Christof Huber,Christine S. Hvidberg,Sigfus J Johnsen,Ulf Jonsell,Jean Jouzel,S. Kipfstuhl,Amaelle Landais,Markus Leuenberger,Regi D. Lorrain,Valérie Masson-Delmotte,Heinrich Miller,Hideaki Motoyama,Hideki Narita,Trevor Popp,Sune Olander Rasmussen,Dominique Raynaud,R. Röthlisberger,U. Ruth,Denis Samyn,Jakob Schwander,Hitoshi Shoji,M. L. Siggard-Andersen,Jørgen Peder Steffensen,Thomas F. Stocker,A. E. Sveinbjörnsdottir,Anders Svensson,Morimasa Takata,Jean-Louis Tison,T. Thorsteinsson,Okitsugu Watanabe,Frank Wilhelms,James W. C. White +48 more
TL;DR: 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.
Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes
TL;DR: It is found that the meridional overturning was nearly, or completely, eliminated during the coldest deglacial interval in the North Atlantic region, beginning with the catastrophic iceberg discharge Heinrich event H1, 17,500’yr ago, and declined sharply but briefly into the Younger Dryas cold event, about 12,700 yr ago.
Heinrich events: Massive late Pleistocene detritus layers of the North Atlantic and their global climate imprint
TL;DR: In this paper, the Heinrich detritus appears to have been derived from the region around Hudson Strait and was deposited over approximately 500 ± 250 years, and several mechanisms have been proposed for the origin of the layers: binge-purge cycle of the Laurentide ice sheet, jokulhlaup activity from Hudson Bay lake, and an ice shelf buildup/collapse fed by Hudson Strait.
1.4K
One-to-one coupling of glacial climate variability in Greenland and Antarctica.
Carlo Barbante,J. M. Barnola,J. M. Barnola,Silvia Becagli,J. Beer,J. Beer,M. Bigler,Claude F. Boutron,Claude F. Boutron,Thomas Blunier,E. Castellano,Olivier Cattani,Jérôme Chappellaz,Jérôme Chappellaz,Dorthe Dahl-Jensen,Maxime Debret,Barbara Delmonte,D. Dick,S. Falourd,Sérgio H. Faria,Urs Federer,Hubertus Fischer,Johannes Freitag,Andreas Frenzel,Diedrich Fritzsche,Felix Fundel,Paolo Gabrielli,Vania Gaspari,Rainer Gersonde,Wolfgang Graf,D. Grigoriev,Ilka Hamann,Margareta Hansson,George R. Hoffmann,Hutterli,Philippe Huybrechts,Elisabeth Isaksson,Sigfus J Johnsen,Jean Jouzel,M. Kaczmarska,Torbjörn Karlin,Patrik R Kaufmann,S. Kipfstuhl,Mika Kohno,Fabrice Lambert,Astrid Lambrecht,Amaelle Landais,Gunther Lawer,Markus Leuenberger,Geneviève C Littot,L. Loulergue,Dieter Lüthi,Valter Maggi,F. Marino,Valérie Masson-Delmotte,Hanno Meyer,Heinrich Miller,Robert Mulvaney,Biancamaria Narcisi,Johannes Oerlemans,H. Oerter,Frédéric Parrenin,J. R. Petit,Grant M. Raisbeck,Dominique Raynaud,Regine Röthlisberger,U. Ruth,Oleg Rybak,Mirko Severi,Jochen Schmitt,Jakob Schwander,Urs Siegenthaler,M.-L. Siggaard-Andersen,Renato Spahni,Jørgen Peder Steffensen,Barbara Stenni,Thomas F. Stocker,Jean-Louis Tison,Rita Traversi,Roberto Udisti,Fernando Valero-Delgado,M. R. van den Broeke,R. S. W. van de Wal,Dietmar Wagenbach,Anna Wegner,K. Weiler,Frank Wilhelms,Jan-Gunnar Winther,Eric W. Wolff +88 more
TL;DR: In this paper, a glacial climate record derived from an ice core from Dronning Maud Land, Antarctica, which represents South Atlantic climate at a resolution comparable with the Greenland ice core records was presented.
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