GRIP Ice Core Basal Ice Stable Isotope Data Souchez, R. Souchez, R. 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 earth science/paleoclimate/ice core earth science/paleoclimate/ice core (GRIP>LATITUDE 72.58>LONGITUDE -37.63) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Souchez, R. 1997-11-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17840 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/physical/debris.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/isotopes/isobas.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/physical/debris.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/isotopes/isobas.txt English https://www.ncdc.noaa.gov/paleo/study/17840 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/physical/debris.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/isotopes/isobas.txt R. Souchez1997The buildup of the ice sheet in central GreenlandJournal of Geophysical Research: Oceans102C1226317-26323 10.1029/96JC01558http://onlinelibrary.wiley.com/enhanced/doi/10.1029/96JC01558/ START YEAR: 2400000 cal yr BP * END YEAR: 2300000 cal yr BP -37.63 72.58 -37.63 72.58