GRIP Ice Core Basal Ice Gas Concentrations Souchez, R.; Lemmens, M.; Chappellaz, J.A. Souchez, R. Lemmens, M. Chappellaz, J.A. earth science/paleoclimate/climate forcing|ice cores (methane,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (oxygen gas,bulk atmosphere,null,percent,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (air content,bulk atmosphere,null,milliliter per gram,null,ice cores,null,null,N,null) earth science/paleoclimate/climate forcing|ice cores (carbon dioxide,bulk atmosphere,null,parts per million,null,climate forcing|ice cores,null,null,N,null) earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (nitrogen gas,bulk atmosphere,null,percent,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core (GRIP>LATITUDE 72.58>LONGITUDE -37.63) This paper documents a larger degree of mixing in ice near the bottom of an ice sheet than described, or suspected, previously. It shows, thanks to favourable circumstances due to CO2 and CH4 production underneath the ice, that flow-induced mixing within the basal ice has taken place at the scale of a few centimeters in the GRIP core. Such a mechanism must be considered when interpreting the ice properties in the bottom part of ice sheets and must be taken into account as a potential process of layer disruption in the low levels of the Central Greenland ice cores. STUDY NOTES: This file contains gas data from the GRIP basal ice. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Souchez, R. Investigator : Lemmens, M. Investigator : Chappellaz, J.A. 1997-11-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17876 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gasbas.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gasbas.txt English https://www.ncdc.noaa.gov/paleo/study/17876 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gasbas.txt R. Souchez, M. Lemmens, J. Chappellaz1995Flow-induced mixing in the GRIP basal ice deduced from the CO2 and CH4 recordsGeophysical Research Letters22141-4410.1029/94GL02863http://onlinelibrary.wiley.com/enhanced/doi/10.1029/94GL02863 START YEAR: 248000 cal yr BP * END YEAR: 230000 cal yr BP -37.63 72.58 -37.63 72.58