noaa-icecore-17881 GRIP Ice Core 40 KYr Total Air Content Data Raynaud, D.; Chappellaz, J.A.; Ritz, C.; Martinerie, P. GRIP Ice Core 40 KYr Total Air Content Data 1997-11-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17881 Investigator D. Raynaud Investigator J.A. Chappellaz Investigator C. Ritz Investigator P. Martinerie 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 atmospheric gas geoscientificInformation 40851 cal yr BP 167 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 Dominique Raynaud, Jerome Chappellaz, Catherine Ritz, Patricia Martinerie 1997 Journal of Geophysical Research: Oceans 102 C12 26607-26613 10.1029/97JC01908 http://onlinelibrary.wiley.com/enhanced/doi/10.1029/97JC01908/

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/gripair.txt Data File; GRIP total air content USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11