Dwyer Gary S.

No Thumbnail Available
Last Name
Dwyer
First Name
Gary S.
ORCID

Filters

2011 1
1
Reset filters

Settings
Type: Article × Subject: Atlantic Layer ×

Search Results

Now showing 1 - 1 of 1
  • Article
    Western Arctic Ocean temperature variability during the last 8000 years
    (American Geophysical Union, 2011-12-17) Farmer, Jesse R. ; Cronin, Thomas M. ; de Vernal, Anne ; Dwyer, Gary S. ; Keigwin, Lloyd D. ; Thunell, Robert C.
    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.