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In the high reaches of the Canadian Arctic, conducting climate research for UMass Amherst, postdoctoral researcher Francois Lapointe and his Inuit guide were chased by a muskox. Eluding the huge creature, Lapointe returned to UMass with important evidence of unprecedented warming of the Atlantic Ocean. A team led by Lapointe and University Distinguished Professor Raymond Bradley in the Climate System Research Center of the University of Massachusetts Amherst and Pierre Francus at University of Québec-INRS analyzed sediments gathered from the bottom of Sawtooth Lake on remote Ellesmere Island. The sediments provide a record of the Atlantic temperatures there as long as 2,900 years ago and show that the warmest interval over this period has been in the past 10 years.

Resolute bayAtlantic oceanFrancois lapointePierre francus at university of quUniversity of massachusetts amherstClimate system research centerMorrill science centerPolar continental shelf programProceedings of the national academy sciencesDepartment of geosciencesUniversity distinguished professor raymond bradleyMassachusetts amherstPierre francusSawtooth lakeHigh arcticCanadian arctic