GISP2 Ice Core 1997 Layer-Counter Timescale Meese, D.A.; Gow, A.J.; Alley, R.B.; Zielinski, G.A.; Grootes, P.M.; Ram, M.; Taylor, K.C.; Mayewski, P.A.; Bolzan, J.F. Meese, D.A. Gow, A.J. Alley, R.B. Zielinski, G.A. Grootes, P.M. Ram, M. Taylor, K.C. Mayewski, P.A. Bolzan, J.F. earth science/paleoclimate/ice cores (notes,null,null,null,null,ice cores,null,null,C,null) earth science/paleoclimate/ice cores (ice age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (layer thickness,bulk ice,null,meter,null,ice cores,null,null,N,annual layer thickness) earth science/paleoclimate/ice cores (ice age,null,null,calendar year before present,null,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 core (GISP2>LATITUDE 72.6>LONGITUDE -38.5) The Greenland Ice Sheet Project 2 (GISP2) depth-age scale is presented based on a multiparameter continuous count approach, to a depth of 2800 m, using a systematic combination of parameters that have never been used to this extent before. The ice at 2800 m is dated at 110,000 years B.P. with an estimated error ranging from 1 to 10% in the top 2500 m of the core and averaging 20% between 2500 and 2800 m. Parameters used to date the core include visual stratigraphy, oxygen isotopic ratios of the ice, electrical conductivity measurements, laser-light scattering from dust, volcanic signals, and major ion chemistry. GISP2 ages for major climatic events agree with independent ages based on varve chronologies, calibrated radiocarbon dates, and other techniques within the combined uncertainties. Good agreement also is obtained with Greenland Ice Core Project ice core dates and with the SPECMAP marine timescale after correlation through the d18O of O2. Although the core is deformed below 2800 m and the continuity of the record is unclear, we attempted to date this section of the core on the basis of the laser-light scattering of dust in the ice. STUDY NOTES: This is the depth-age scale for the GISP2 D core based on annual layer counting. This time-scale provides more annual detail than the official GISP2 timescale (the Meese/Sowers timescale). NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Meese, D.A. Investigator : Gow, A.J. Investigator : Alley, R.B. Investigator : Zielinski, G.A. Investigator : Grootes, P.M. Investigator : Ram, M. Investigator : Taylor, K.C. Investigator : Mayewski, P.A. Investigator : Bolzan, J.F. 1997-11-30 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/17835 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/depthage/countage.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/depthage/bcoreage.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/depthage/countage.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/depthage/bcoreage.txt English https://www.ncdc.noaa.gov/paleo/study/17835 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/depthage/countage.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/depthage/bcoreage.txt D. A. Meese, A. J. Gow, R. B. Alley, G. A. Zielinski, P. M. Grootes, M. Ram, K. C. Taylor, P. A. Mayewski, J. F. Bolzan1997The Greenland Ice Sheet Project 2 depth-age scale: Methods and resultsJournal of Geophysical Research: Oceans102C1226411-2642310.1029/97JC00269http://onlinelibrary.wiley.com/enhanced/doi/10.1029/97JC00269/ START YEAR: 163164 cal yr BP * END YEAR: -39 cal yr BP -38.5 72.6 -38.5 72.6