S
Sigfus J Johnsen
Researcher at University of Copenhagen
Publications - 209
Citations - 50997
Sigfus J Johnsen is an academic researcher from University of Copenhagen. The author has contributed to research in topics: Ice core & Ice sheet. The author has an hindex of 94, co-authored 209 publications receiving 47832 citations. Previous affiliations of Sigfus J Johnsen include Niels Bohr Institute & Denver Federal Center.
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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
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.
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
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.
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Eight glacial cycles from an Antarctic ice core
Laurent Augustin,Carlo Barbante,Piers R. F. Barnes,J. M. Barnola,Matthias Bigler,Emiliano Castellano,Olivier Cattani,Jérôme Chappellaz,Dorthe Dahl-Jensen,Barbara Delmonte,Gabrielle Dreyfus,Gaël Durand,S. Falourd,Hubertus Fischer,Jacqueline Flückiger,Margareta Hansson,Philippe Huybrechts,Gérard Jugie,Sigfus J Johnsen,Jean Jouzel,Patrik R Kaufmann,Josef Kipfstuhl,Fabrice Lambert,Vladimir Ya. Lipenkov,Geneviève C Littot,Antonio Longinelli,Reginald Lorrain,Valter Maggi,Valérie Masson-Delmotte,Heinz Miller,Robert Mulvaney,Johannes Oerlemans,Hans Oerter,Giuseppe Orombelli,Frédéric Parrenin,David A. Peel,J. R. Petit,Dominique Raynaud,Catherine Ritz,Urs Ruth,Jakob Schwander,Urs Siegenthaler,Roland Souchez,Bernhard Stauffer,Jørgen Peder Steffensen,Barbara Stenni,Thomas F. Stocker,Ignazio Tabacco,Roberto Udisti,Roderik S. W. van de Wal,Michiel R. van den Broeke,Jérôme Weiss,Frank Wilhelms,Jan-Gunnar Winther,Eric W. Wolff,Mario Zucchelli +55 more
TL;DR: The recovery of a deep ice core from Dome C, Antarctica, that provides a climate record for the past 740,000 years is reported, suggesting that without human intervention, a climate similar to the present one would extend well into the future.
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.