North Atlantic Climatic Oscillations Revealed by Deep Greenland Ice Cores

  1. James E. Hansen and
  2. Taro Takahashi
  1. W. Dansgaard1,
  2. S.J. Johnsen1,
  3. H.B. Clausen1,
  4. D. Dahl-Jensen1,
  5. N. Gundestrup1,
  6. C.U. Hammer1 and
  7. H. Oeschger2

Published Online: 19 MAR 2013

DOI: 10.1029/GM029p0288

Climate Processes and Climate Sensitivity

Climate Processes and Climate Sensitivity

How to Cite

Dansgaard, W., Johnsen, S.J., Clausen, H.B., Dahl-Jensen, D., Gundestrup, N., Hammer, C.U. and Oeschger, H. (1984) North Atlantic Climatic Oscillations Revealed by Deep Greenland Ice Cores, in Climate Processes and Climate Sensitivity (eds J. E. Hansen and T. Takahashi), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM029p0288

Author Information

  1. 1

    Geophysical Isotope Laboratory, University of Copenhagen, Haraldsgade 6 Dk-22000 Copenhagen, Denmark

  2. 2

    Physikalisches Institut, Universitat Bern, Sidlerstrasse 5, Ch-3012 Bern, Switzerland

Publication History

  1. Published Online: 19 MAR 2013
  2. Published Print: 1 JAN 1984

ISBN Information

Print ISBN: 9780875904047

Online ISBN: 9781118666036

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Keywords:

  • Climatology—Congresses;
  • Geophysics—Congresses;
  • Ocean-atmosphere interaction—Congresses

Summary

Five long-term oxygen isotope (δ) records along ice cores are discussed, in particular two from the Greenland ice sheet that exhibit persistent δ oscillations with a quasi-periodicity of ca. 2550 years. A detailed study of the δ cycles in the Wisconsin glaciation show that they cannot be ascribed to discontinuities in the cores, nor to ice-dynamic instabilities in the ice sheet. In the Holocene, the δ cycles are less pronounced, but they are concurrent with the fluctuating glacier extention elsewhere, which substantiates their climatic significance. An anti-correlation with 14C concentration in atmospheric CO2, and with 10Be deposition rates on the ice sheets, suggests a connection between climate and solar processes, but a conclusion on this point must await clarification of the terrestrial circulation and mixing processes, and the relationship between the solar outputs of radiation and particulate matter.