GRIP Ice Core 40 KYr Total Air Content Data Raynaud, D.; Chappellaz, J.A.; Ritz, C.; Martinerie, P. Raynaud, D. Chappellaz, J.A. Ritz, C. Martinerie, P. earth science/paleoclimate/ice cores (depth,null,null,meter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (air content,bulk ice,null,milliliter per gram,null,ice cores,null,barometric method,N,null) earth science/paleoclimate/ice cores (age,null,null,calendar year before present,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (air content,bulk ice,null,milliliter per gram,null,ice cores,null,gas chromatography,N,null) earth science/paleoclimate/ice core (GRIP>LATITUDE 72.58>LONGITUDE -37.63) We present here measurements of the air content of the ice, V, performed along the Greenland Ice Core Project (GRIP) ice core. The main features of the long-term trends are (1) a decrease of 13% between the last glacial maximum (LGM) and the earliest part of the Holocene, and (2) an increase of 8% during the Holocene. The results are discussed in terms of changes in atmospheric pressure, surface elevation and porosity at close-off. The V record contains a significant signal of past changes of surface elevation in qualitative agreement with ice sheet modeling simulations. It suggests a thickening of central Greenland during the transition from the LGM to the early Holocene, and a significant thinning through the Holocene period. It also stresses the large influence on past V variations of changes in ice porosity, which are not explained by the present-day spatial relationship with temperature and may reflect changes in other surface climatic parameters (like precipitation seasonality or wind stress). The potential role of temporal variations of atmospheric pressure patterns is also evaluated. Air content results in the GRIP ice older than 110 ka indicate values approximately in the same range as those observed during the last 40,000 years, with generally higher air content corresponding to isotopically warmer ice. STUDY NOTES: Air content (cubic centimeters per gram of ice) for the GRIP ice core. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Raynaud, D. Investigator : Chappellaz, J.A. Investigator : Ritz, C. Investigator : Martinerie, P. 1997-11-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17881 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gripair.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gripair.txt English https://www.ncdc.noaa.gov/paleo/study/17881 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gripair.txt Dominique Raynaud, Jerome Chappellaz, Catherine Ritz, Patricia Martinerie1997Air content along the Greenland Ice Core Project core: A record of surface climatic parameters and elevation in central GreenlandJournal of Geophysical Research: Oceans102C1226607-2661310.1029/97JC01908http://onlinelibrary.wiley.com/enhanced/doi/10.1029/97JC01908/ START YEAR: 40851 cal yr BP * END YEAR: 167 cal yr BP -37.63 72.58 -37.63 72.58