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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What can morphology and isozymes tell us about the history of the Dryas integrifolia–octopetala complex?
M. Philipp,Hans R. Siegismund +1 more
TL;DR: The purpose of this study was to investigate the population structure of the Dryas integrifolia–octopetala complex using a combination of morphological and genetic characters and concluded that populations in east Greenland immigrated postglacially from Svalbard.
Journal ArticleDOI
Resolution of ice streams and outlet glaciers in large-scale simulations of the Greenland ice sheet
TL;DR: In this paper, the authors applied the SICOPOLIS model to the Greenland ice sheet with three different grid spacings, namely 20, 10 and 5 km, and compared the simulated and observed present-day surface velocities with different accuracies.
Journal ArticleDOI
Twentieth-century warming revives the world’s northernmost lake
Bianca B. Perren,Alexander P. Wolfe,Colin A. Cooke,Kurt H. Kjær,David Mazzucchi,Eric J. Steig +5 more
TL;DR: In this paper, a 3500-yr paleolimnological record from the world's northernmost lake was used to explore whether recent ecological changes are more strongly associated with climate warming or the deposition of reactive nitrogen (Nr) from anthropogenic sources.
Sierra Nevada forests: Where did they come from? Where are they going? What does it mean?
TL;DR: In the recent past, climates have changed at similar rates and magnitudes to predicted anthropogenic changes, catalyzing significant natural changes in terrestrial ecosystems as discussed by the authors, and the implications of climate change to conservation and management planning are great.
The Global Heat Flow Database: Release 2021
Sven Fuchs,Ben Norden,Irina Artemieva,Paolo Chiozzi,Petr Dedecek,Dmitry Demezhko,Andrea Förster,Gianluca Gola,Will Gosnold,Valiya Hamza,Robert N. Harris,Lijuan He,Shaopeng Huang,Thomas Kohl,Youngmin Lee,Shaowen Liu,Nagaraju Podugu,Raquel Negrete-Aranda,Jeffrey Poort,Sukanta Roy,Akiko Tanaka,Guzel Vakhitova,Massimo Verdoya +22 more
TL;DR: The IHFC Global Heat Flow Data Assessment Project (GFDAP) as mentioned in this paper provides a dataset of global heat-flow data generated between 1939 and 2021 and constitutes an updated and extended version of the 2012 International Heat Flow Commission (IHFC) database release.
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.