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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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Oxygen isotope and palaeotemperature records from six Greenland ice‐core stations: Camp Century, Dye‐3, GRIP, GISP2, Renland and NorthGRIP
Sigfus J Johnsen,Sigfus J Johnsen,Dorthe Dahl-Jensen,Niels S. Gundestrup,Jørgen Peder Steffensen,Henrik Clausen,Heinz Miller,Valérie Masson-Delmotte,Arny E. Sveinbjörnsdottir,James W. C. White +9 more
TL;DR: In this article, a new record of Holocene isotope variations obtained from the NorthGRIP ice-core matches the GRIP short-term isotope record, and also shows similar long-term trends to the Dye-3 and GRIP inverted temperature data.
Journal ArticleDOI
Past Temperatures Directly from the Greenland Ice Sheet
Dorthe Dahl-Jensen,Klaus Mosegaard,Niels S. Gundestrup,Gary D. Clow,Sigfus J Johnsen,A. W. Hansen,Niels Balling +6 more
TL;DR: A Monte Carlo inverse method has been used on the temperature profiles measured down through the Greenland Ice Core Project (GRIP) borehole, at the summit of the Greenland ice Sheet, and the Dye 3 borehole 865 kilometers farther south, resulting in a 50, 000-year-long temperature history at GRIP and a 7000-year history at Dye3.
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A 60 000 year Greenland stratigraphic ice core chronology
Anders Svensson,Katrine Krogh Andersen,Matthias Bigler,Henrik Clausen,Dorthe Dahl-Jensen,Siwan M. Davies,Sigfus J Johnsen,Raimund Muscheler,Frédéric Parrenin,Sune Olander Rasmussen,Regine Röthlisberger,Inger K Seierstad,Jørgen Peder Steffensen,Bo Møllesøe Vinther,Bo Møllesøe Vinther +14 more
TL;DR: The Greenland Ice Core Chronology 2005 (GICC05) as discussed by the authors is a time scale based on annual layer counting of high-resolution records from Greenland ice cores, which continuously covers the past 60 ka.
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An event stratigraphy for the Last Termination in the North Atlantic region based on the Greenland ice-core record: a proposal by the INTIMATE group
Svante Björck,Michael Walker,Les C. Cwynar,Sigfus J Johnsen,Karen Luise Knudsen,J. John Lowe,Barbara Wohlfarth +6 more
TL;DR: Based on the oxygen isotope signal in the GRIP Greenland ice core, a new event stratigraphy spanning the time interval from ca. 22.0 to 11.5 k GRIP yr BP (ca. 19.0-10.0 k 14 C yr BP) is proposed for the North Atlantic region as mentioned in this paper.
Journal ArticleDOI
Asynchrony of Antarctic and Greenland climate change during the last glacial period
Thomas Blunier,Jérôme Chappellaz,Jakob Schwander,A. Dällenbach,Bernhard Stauffer,Thomas F. Stocker,Dominique Raynaud,Jean Jouzel,Henrik Clausen,Claus U. Hammer,Sigfus J Johnsen,Sigfus J Johnsen +11 more
TL;DR: A comparison of the global atmospheric concentration of methane as recorded in ice cores from Antarctica and Greenland permits a determination of the phase relationship (in leads or lags) of these temperature variations as mentioned in this paper.