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Western Arctic Ocean temperature variability during the last 8000 years

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dc.contributor.author Farmer, Jesse R.
dc.contributor.author Cronin, Thomas M.
dc.contributor.author de Vernal, Anne
dc.contributor.author Dwyer, Gary S.
dc.contributor.author Keigwin, Lloyd D.
dc.contributor.author Thunell, Robert C.
dc.date.accessioned 2012-01-23T19:55:54Z
dc.date.issued 2011-12-17
dc.identifier.citation Geophysical Research Letters 38 (2011): L24602 en_US
dc.identifier.uri http://hdl.handle.net/1912/4989
dc.description Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 38 (2011): L24602, doi:10.1029/2011GL049714. en_US
dc.description.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. en_US
dc.description.sponsorship J.R.F., T.M.C., and R.C.T. thank support by USGS Global Change Program, G.S.D. thanks support from the USGS Global Change Program and the NSF Office of Polar Programs, A.d.V. thanks support by Fond québécois de la recherché sur la nature et les technologies (FQRNT) and the Ministere du Développement économique, innovation et exportation (MDEIE) of Quebec. en_US
dc.format.mimetype application/postscript
dc.format.mimetype text/plain
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2011GL049714
dc.subject Arctic Ocean en_US
dc.subject Atlantic Layer en_US
dc.subject Temperature en_US
dc.subject Variability en_US
dc.title Western Arctic Ocean temperature variability during the last 8000 years en_US
dc.type Article en_US
dc.description.embargo 2012-06-17
dc.identifier.doi 10.1029/2011GL049714


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