Western Arctic Ocean temperature variability during the last 8000 years
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 t...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8GT5XXT 2023-05-15T14:47:51+02:00 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. 2011 https://doi.org/10.7916/D8GT5XXT English eng https://doi.org/10.7916/D8GT5XXT Paleoclimatology Articles 2011 ftcolumbiauniv https://doi.org/10.7916/D8GT5XXT 2019-04-04T08:08:11Z 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. Article in Journal/Newspaper Arctic Arctic Ocean canada basin Foraminifera* Sea ice Columbia University: Academic Commons Arctic Arctic Ocean Canada |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Paleoclimatology |
spellingShingle |
Paleoclimatology Farmer, Jesse Robert Cronin, Thomas M. Vernal, Anne de Dwyer, Gary S. Keigwin, Lloyd D. Thunell, Robert C. Western Arctic Ocean temperature variability during the last 8000 years |
topic_facet |
Paleoclimatology |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Farmer, Jesse Robert Cronin, Thomas M. Vernal, Anne de Dwyer, Gary S. Keigwin, Lloyd D. Thunell, Robert C. |
author_facet |
Farmer, Jesse Robert Cronin, Thomas M. Vernal, Anne de Dwyer, Gary S. Keigwin, Lloyd D. Thunell, Robert C. |
author_sort |
Farmer, Jesse Robert |
title |
Western Arctic Ocean temperature variability during the last 8000 years |
title_short |
Western Arctic Ocean temperature variability during the last 8000 years |
title_full |
Western Arctic Ocean temperature variability during the last 8000 years |
title_fullStr |
Western Arctic Ocean temperature variability during the last 8000 years |
title_full_unstemmed |
Western Arctic Ocean temperature variability during the last 8000 years |
title_sort |
western arctic ocean temperature variability during the last 8000 years |
publishDate |
2011 |
url |
https://doi.org/10.7916/D8GT5XXT |
geographic |
Arctic Arctic Ocean Canada |
geographic_facet |
Arctic Arctic Ocean Canada |
genre |
Arctic Arctic Ocean canada basin Foraminifera* Sea ice |
genre_facet |
Arctic Arctic Ocean canada basin Foraminifera* Sea ice |
op_relation |
https://doi.org/10.7916/D8GT5XXT |
op_doi |
https://doi.org/10.7916/D8GT5XXT |
_version_ |
1766318957853147136 |