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Study Finds 6⁰C Cooling on Land during the Last Ice Age, With Implications about Future Global Warming Ancient groundwater flows from a well in the North China plain during a field campaign in 2004 to measure noble gases to reconstruct past temperature. (Photo credit: Werner Aeschbach) Newswise Woods Hole, Mass. (May 12, 2021) Low-to-mid latitude land surfaces at low elevation cooled on average by 5.8 ± 0.6⁰C during the Last Glacial Maximum (LGM), based on an analysis of noble gases dissolved in groundwater, according to a new study published in Temperature estimates in the study are substantially lower than indicated by some notable marine and low-elevation terrestrial studies that have relied on various proxies to reconstruct past temperatures during the LGM, a period about 20,000 years ago that represents the most recent extended period of globally stable climate that was substantially cooler than present.

New yorkUnited statesBaden wübergWoods holeCape codAlanm seltzerJeffrey severinghausAlan seltzerWerner aeschbachJeffreyp severinghausMartin stuteJustint kulongoskiRolf kipferSwiss federal institute technologyInstitute of biogeochemistryDepartment water resources