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
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TLDR
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.Abstract:
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. The result is a 50, 000-year-long temperature history at GRIP and a 7000-year history at Dye 3. The Last Glacial Maximum, the Climatic Optimum, the Medieval Warmth, the Little Ice Age, and a warm period at 1930 A.D. are resolved from the GRIP reconstruction with the amplitudes -23 kelvin, +2.5 kelvin, +1 kelvin, -1 kelvin, and +0.5 kelvin, respectively. The Dye 3 temperature is similar to the GRIP history but has an amplitude 1.5 times larger, indicating higher climatic variability there. The calculated terrestrial heat flow density from the GRIP inversion is 51.3 milliwatts per square meter.read more
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Paleoclimatic evolution of the Galician continental shelf (NW of Spain) during the last 3000 years: from a storm regime to present conditions
Raquel González-Álvarez,Patricia Bernárdez,Leopoldo D. Pena,Guillermo Francés,Ricardo Prego,Paula Diz,Federico Vilas +6 more
TL;DR: In this paper, a multiproxy study of the sedimentary record carried out on gravity core CGPL00-1 retrieved from the outer Galician continental shelf (NW of Spain) has allowed us to establish the main climate fluctuations affecting the region during the Upper Holocene.
Journal ArticleDOI
Palynofacies analysis and organic-walled dinoflagellate cysts in late-Holocene sediments from Igaliku Fjord, South Greenland:
Lucia Roncaglia,Antoon Kuijpers +1 more
TL;DR: In this article, the late-Holocene (past 3300 years) variations in organic matter deposition in the outer part of Igaliku Fjord, South Greenland, and uses this information to assess palaeohydrographic conditions.
Journal ArticleDOI
Greenland ice sheet contribution to sea level rise during the last interglacial period: a modelling study driven and constrained by ice core data
TL;DR: In this paper, the authors performed long-term simulations of the Greenland ice sheet (GIS) using an improved ice sheet model and suggested a relatively low contribution to LIG sea level rise from Greenland melting, ranging from 0.7 to 1.5 m of sea level equivalent.
Journal ArticleDOI
Holocene recolonization and extinction of the pond turtle, Emys orbicularis (L., 1758), in Europe
TL;DR: In this article, the authors reconstruct the Holocene range fluctuations of the European pond turtle (Emys orbicularis) for northern and Central Europe based on 529 subfossil records and radiocarbon dating of critical finds.
Journal Article
Celestial Climate Driver: A Perspective from Four Billion Years of the Carbon Cycle
TL;DR: In this article, an alternative model that the sun is the principal driver of climate change was revived by a host of empirical observations, which can serve as indirect proxies for solar activity and can be measured e.g., in ancient sediments, trees, and shells.
References
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Journal ArticleDOI
Decadal Trends in the North Atlantic Oscillation: Regional Temperatures and Precipitation
TL;DR: An evaluation of the atmospheric moisture budget reveals coherent large-scale changes since 1980 that are linked to recent dry conditions over southern Europe and the Mediterranean, whereas northern Europe and parts of Scandinavia have generally experienced wetter than normal conditions.
Journal ArticleDOI
Heat flow from the Earth's interior: Analysis of the global data set
TL;DR: In this paper, a new estimate of the Earth's heat loss based on a new global compilation of heat flow measurements comprising 24,774 observations at 20,201 sites is presented, which when areally weighted yield a global mean of 87 mW m -2 and a global heat loss of 44.2 x 10 2 W, an increase of some 4-8% over earlier estimates.
Journal ArticleDOI
Monte Carlo sampling of solutions to inverse problems
Klaus Mosegaard,Albert Tarantola +1 more
TL;DR: In inverse problems, obtaining a maximum likelihood model is usually not sucient, as the theory linking data with model parameters is nonlinear and the a posteriori probability in the model space may not be easy to describe.
Journal ArticleDOI
Arctic Environmental Change of the Last Four Centuries
Jonathan T. Overpeck,Konrad A Hughen,D. Hardy,Raymond S. Bradley,R. Case,M. A. Douglas,Bruce P. Finney,K. Gajewski,Gordon C. Jacoby,Anne E. Jennings,Scott F. Lamoureux,A. Lasca,Glen M. MacDonald,J.J. Moore,Michael Retelle,S. Smith,Alexander P. Wolfe,G. Zielinski +17 more
TL;DR: A compilation of paleoclimate records from lake sediments, trees, glaciers, and marine sediments provides a view of circum-Arctic environmental variability over the last 400 years.
Journal ArticleDOI
Climate instability during the last interglacial period recorded in the GRIP ice core
TL;DR: Isotope and chemical analyses of the GRIP ice core from Summit, central Greenland reveal that climate in Greenland during the last interglacial period was characterized by a series of severe cold periods, which began extremely rapidly and lasted from decades to centuries.