Western Arctic Ocean temperature variability during the last 8000 years
Geophysical Research Letters
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Abstract
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.
Suggested Citation
Farmer, J.R., Cronin, T.M., De Vernal, A., Dwyer, G., Keigwin, L.D., and Thunell, R.C., 2011, Western Arctic Ocean temperature variability during the last 8000 years: Geophysical Research Letters, v. 38, no. 24, https://doi.org/10.1029/2011GL049714.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Western Arctic Ocean temperature variability during the last 8000 years |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2011GL049714 |
| Volume | 38 |
| Issue | 24 |
| Publication Date | December 17, 2011 |
| Year Published | 2011 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |