Western Arctic Ocean temperature variability during the last 8000 years
Article first published online: 17 DEC 2011
Copyright 2011 by the American Geophysical Union.
Geophysical Research Letters
Volume 38, Issue 24, December 2011
How to Cite
2011), Western Arctic Ocean temperature variability during the last 8000 years, Geophys. Res. Lett., 38, L24602, doi:10.1029/2011GL049714., , , , , and (
- Issue published online: 17 DEC 2011
- Article first published online: 17 DEC 2011
- Manuscript Accepted: 9 NOV 2011
- Manuscript Revised: 8 NOV 2011
- Manuscript Received: 22 SEP 2011
- Arctic Ocean;
- Atlantic Layer;
 We reconstructed subsurface (∼200–400 m) ocean temperature and sea-ice cover in the Canada Basin, western Arctic Ocean from foraminiferal δ18O, ostracode Mg/Ca ratios, and dinocyst assemblages from two sediment core records covering the last 8000 years. Results show mean temperature varied from −1 to 0.5°C and −0.5 to 1.5°C at 203 and 369 m water depths, respectively. Centennial-scale warm periods in subsurface temperature records correspond to reductions in summer sea-ice cover inferred from dinocyst assemblages around 6.5 ka, 3.5 ka, 1.8 ka and during the 15th century Common Era. These changes may reflect centennial changes in the temperature and/or strength of inflowing Atlantic Layer water originating in the eastern Arctic Ocean. By comparison, the 0.5 to 0.7°C warm temperature anomaly identified in oceanographic records from the Atlantic Layer of the Canada Basin exceeded reconstructed Atlantic Layer temperatures for the last 1200 years by about 0.5°C.