noaa-icecore-19015 Combined NGRIP-Cariaco Basin 56,000 Year d18O Record Cooper, A.; Turney, C.S.M.; Hughen, K.A.; Brook, B.W.; McDonald, H.G.; Bradshaw, C.J.A. Combined NGRIP-Cariaco Basin 56,000 Year d18O Record 2015-07-23 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/19015 Investigator A. Cooper Investigator C.S.M. Turney Investigator K.A. Hughen Investigator B.W. Brook Investigator H.G. McDonald Investigator C.J.A. Bradshaw earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil VSMOW,null,ice cores,null,null,N,null earth science paleoclimate ice cores ice age,null,null,calendar year before present,null,ice cores,null,null,N,null earth science paleoclimate ice core oxygen isotopes geoscientificInformation 56050 cal yr BP -30 cal yr BP Complete 75.1 75.1 -42.33 -42.33 2917 2917 Continent North America Greenland NGRIP>LATITUDE 75.1>LONGITUDE -42.33 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Alan Cooper, Chris Turney, Konrad A. Hughen, Barry W. Brook, H. Gregory McDonald, Corey J. A. Bradshaw 2015 Science 10.1126/science.aac4315 http://www.sciencemag.org/content/early/2015/07/22/science.aac4315.abstract

The mechanisms of Late Pleistocene megafauna extinctions remain fiercely contested, with human impact or climate change cited as principal drivers. Here, we compare ancient DNA and radiocarbon data from 31 detailed time series of regional megafaunal extinctions/replacements over the past 56,000 years with standard and new combined records of Northern Hemisphere climate in the Late Pleistocene. Unexpectedly, rapid climate changes associated with interstadial warming events are strongly associated with the regional replacement/extinction of major genetic clades or species of megafauna. The presence of many cryptic biotic transitions prior to the Pleistocene/Holocene boundary revealed by ancient DNA confirms the importance of climate change in megafaunal population extinctions and suggests that metapopulation structures necessary to survive such repeated and rapid climatic shifts were susceptible to human impacts. STUDY NOTES: North Greenland Ice Sheet Project (NGRIP) oxygen isotope (d18O) data at 20-year resolution, combined with the Cariaco Basin chronology.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/isotopes/ngrip2015d18o.txt Data File; NGRIP d18O Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11