Climate Dynamics

, Volume 34, Issue 6, pp 781–795 | Cite as

Unprecedented low twentieth century winter sea ice extent in the Western Nordic Seas since A.D. 1200

  • M. Macias Fauria
  • A. Grinsted
  • S. Helama
  • J. Moore
  • M. Timonen
  • T. Martma
  • E. Isaksson
  • M. Eronen
Article

Abstract

We reconstructed decadal to centennial variability of maximum sea ice extent in the Western Nordic Seas for A.D. 1200–1997 using a combination of a regional tree-ring chronology from the timberline area in Fennoscandia and δ18O from the Lomonosovfonna ice core in Svalbard. The reconstruction successfully explained 59% of the variance in sea ice extent based on the calibration period 1864–1997. The significance of the reconstruction statistics (reduction of error, coefficient of efficiency) is computed for the first time against a realistic noise background. The twentieth century sustained the lowest sea ice extent values since A.D. 1200: low sea ice extent also occurred before (mid-seventeenth and mid-eighteenth centuries, early fifteenth and late thirteenth centuries), but these periods were in no case as persistent as in the twentieth century. Largest sea ice extent values occurred from the seventeenth to the nineteenth centuries, during the Little Ice Age (LIA), with relatively smaller sea ice-covered area during the sixteenth century. Moderate sea ice extent occurred during thirteenth–fifteenth centuries. Reconstructed sea ice extent variability is dominated by decadal oscillations, frequently associated with decadal components of the North Atlantic Oscillation/Arctic Oscillation (NAO/AO), and multi-decadal lower frequency oscillations operating at ~50–120 year. Sea ice extent and NAO showed a non-stationary relationship during the observational period. The present low sea ice extent is unique over the last 800 years, and results from a decline started in late-nineteenth century after the LIA.

Keywords

Sea ice Paleoclimatology Nordic seas Global warming Ice core Dendroclimatology Svalbard Fennoscandia NAO AO Little Ice Age 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • M. Macias Fauria
    • 1
    • 2
    • 5
    • 10
  • A. Grinsted
    • 4
    • 3
  • S. Helama
    • 2
  • J. Moore
    • 3
    • 6
    • 7
  • M. Timonen
    • 5
  • T. Martma
    • 9
  • E. Isaksson
    • 8
  • M. Eronen
    • 2
  1. 1.Biogeoscience InstituteUniversity of CalgaryCalgaryCanada
  2. 2.Department of GeologyUniversity of HelsinkiHelsinkiFinland
  3. 3.Arctic CentreUniversity of LaplandRovaniemiFinland
  4. 4.Centre for Ice and Climate, Niels Bohr InstituteUniversity of CopenhagenCopenhagenDenmark
  5. 5.Rovaniemi Research StationFinnish Forest InstituteRovaniemiFinland
  6. 6.Thule InstituteUniversity of OuluOuluFinland
  7. 7.College of Global Change and Earth System ScienceBeijing Normal UniversityBeijingChina
  8. 8.Polar Environmental CentreNorwegian Polar InstituteTromsøNorway
  9. 9.Institute of GeologyTallinn University of TechnologyTallinnEstonia
  10. 10.Department of Ecology, Faculty of BiologyUniversity of BarcelonaBarcelonaSpain

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