01357nas a2200205   4500000000100000008004100001260000700042100002100049700001800070700001600088700001700104700001600121700001400137245007000151856003700221300001200258490000700270520086000277022001401137       2023                            d  c031 aDanielle LeBlanc1 aJeremy Shakun1 aLee Corbett1 aPaul Bierman1 aMarc Caffee1 aAlan Hidy00aLaurentide Ice Sheet persistence during Pleistocene interglacials  uhttps://doi.org/10.1130/G50820.1  a496-4990 v513 a<p>While there are no ice sheets in the Northern Hemisphere outside of Greenland today, it is uncertain whether this was also the case during most other Quaternary interglacials. We show, using in situ cosmogenic nuclides in ice-rafted debris, that the Laurentide Ice Sheet was likely more persistent during Quaternary interglacials than often thought. Low 26Al/10Be ratios (indicative of burial of the source area) in marine core sediment suggest sediment source areas experienced only brief (on the order of thousands of years) and/or infrequent ice-free interglacials over the past million years. These results imply that complete Laurentide deglaciation may have only occurred when climate forcings reached levels comparable to those of the early Holocene, making our current interglacial unusual relative to others of the mid-to-late Pleistocene.</p>  a0091-7613