noaa-icecore-17840 GRIP Ice Core Basal Ice Stable Isotope Data Souchez, R. GRIP Ice Core Basal Ice Stable Isotope Data 1997-11-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17840 Investigator R. Souchez earth science paleoclimate ice cores particles,bulk ice,null,fraction,null,ice cores,null,null,N,material left after ice was melted; basal debris earth science paleoclimate ice cores delta 2H,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,null earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,null earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,null earth science paleoclimate ice core mineralogy earth science paleoclimate ice core oxygen isotopes earth science paleoclimate ice core hydrogen isotopes geoscientificInformation 2400000 cal yr BP 2300000 cal yr BP Complete 72.58 72.58 -37.63 -37.63 Continent North America Greenland GRIP>LATITUDE 72.58>LONGITUDE -37.63 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 R. Souchez 1997 Journal of Geophysical Research: Oceans 102 C12 26317-26323 10.1029/96JC01558 http://onlinelibrary.wiley.com/enhanced/doi/10.1029/96JC01558/

A study of the isotopic and gas composition of the basal silty ice recovered by the Greenland Ice Core Project (GRIP) core indicates that local ice formed in the absence of the Greenland Ice Sheet is still preserved at Summit. Such ice developed most probably within a peat deposit in a permafrost environment. This local ice was subsequently intimately mixed with glacier ice from an advancing ice sheet progressing on the site. This is in agreement with the "highland origin and windward growth" hypothesis for ice sheet development, not for an in situ or regional growth from snowbanks. The basal ice from the GRIP core possibly dates back to the original buildup of the Greenland Ice Sheet 2.4 million years ago. STUDY NOTES: Deuterium and oxygen isotope data, plus debris content, from the GRIP basal ice.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/physical/debris.txt Data File; GRIP Basal Ice Debris Content GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/isotopes/isobas.txt Data File; GRIP Basal Ice Stable Isotope Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11