Western Arctic Ocean temperature variability during the last 8000 years

Jesse Robert Farmer; Thomas M. Cronin; Anne de Vernal; Gary S. Dwyer; Lloyd D. Keigwin; Robert C. Thunell

Western Arctic Ocean temperature variability during the last 8000 years
Farmer, Jesse Robert
Cronin, Thomas M.
Vernal, Anne de
Dwyer, Gary S.
Keigwin, Lloyd D.
Thunell, Robert C.
Earth and Environmental Sciences
Lamont-Doherty Earth Observatory
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Geophysical Research Letters
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.
Paleoclimate science
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Jesse Robert Farmer, Thomas M. Cronin, Anne de Vernal, Gary S. Dwyer, Lloyd D. Keigwin, Robert C. Thunell, 2011, Western Arctic Ocean temperature variability during the last 8000 years, Columbia University Academic Commons, http://hdl.handle.net/10022/AC:P:14401.

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