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

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

Content Provider	Springer Nature Link
Author	Macias Fauria, M. Grinsted, A. Helama, S. Moore, J. Timonen, M. Martma, T. Isaksson, E. Eronen, M.
Copyright Year	2009
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.
Starting Page	781
Ending Page	795
Page Count	15
File Format	PDF
ISSN	09307575
Journal	Climate Dynamics
Volume Number	34
Issue Number	6
e-ISSN	14320894
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-06-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sea ice Paleoclimatology Nordic seas Global warming Ice core Dendroclimatology Svalbard Fennoscandia NAO AO Little Ice Age Oceanography Meteorology/Climatology Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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

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