Past temperatures directly from the Greenland Ice Sheet

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...

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Bibliographic Details
Published in:Science
Main Authors: Dahl-Jensen, D., Mosegaard, K., Gundestrup, N., Clow, G. D., Johnsen, S. J., Hansen, A. W., Balling, N.
Format: Article in Journal/Newspaper
Language:English
Published: 1998
Subjects:
Greenland
Dye 3
Dye-3
Greenland ice core
Greenland Ice core Project
GRIP
ice core
Ice Sheet
Online Access:https://pure.au.dk/portal/en/publications/b2d0974a-42de-4c2e-89dd-351c8f6c2888
https://doi.org/10.1126/science.282.5387.268
http://www.scopus.com/inward/record.url?scp=0032500873&partnerID=8YFLogxK
Description
Summary: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 heart flow density from the GRIP inversion is 51.3 milliwatts per square meter.

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