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Alley, Richard B (1999): GISP2 Visual Stratigraphy. PANGAEA,

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Related to:
Alley, Richard B; Anandakrishnan, Sridhar (1995): Variations in melt-layer frequency in the GISP2 ice core: implications for Holocene summer temperatures in central Greenland. Annals of Glaciology, 21, 64-70,
Alley, Richard B; Shuman, Christopher A; Meese, D A; Gow, A J; Taylor, Kendrick C; Cuffey, Kurt M; Fitzpatrick, Joan J; Grootes, Pieter Meiert; Zielinski, G A; Ram, M; Spinelli, Glenn; Elder, Bruce C (1997): Visual-stratigraphic dating of the GISP2 ice core: Basis, reproducibility, and application. Journal of Geophysical Research: Oceans, 102(C12), 26367-26382,
GRIP/GISP (1997): The Greenland Summit Ice Cores CD-ROM GISP2/GRIP. National Snow and Ice Data Center, University of Colorado at Boulder, and World Data Center for Paleoclimatology, National Geophysical Data Center, Boulder Colorado, CD-ROM, grip-gisp.iso
Spinelli, Glenn (1996): A statistical analysis of ice-accumulation level and variability in the GISP2 ice core and a reexamination of the age of the termination of the Younger Dryas cooling episode. Earth System Science Center Technical Report University of New, 96-001
Greenland Ice Core Projects (GRIP/GISP/NGRIP)
Latitude: 72.970000 * Longitude: -38.800000
Date/Time Start: 1990-01-01T00:39:00 * Date/Time End: 1990-01-01T00:39:00
Minimum DEPTH, ice/snow: 0.99 m * Maximum DEPTH, ice/snow: 1867.00 m
GISP2 * Latitude: 72.970000 * Longitude: -38.800000 * Date/Time: 1990-01-01T00:39:00 * Elevation: 3208.0 m * Recovery: 3053 m * Campaign: GISP * Basis: Sampling/drilling ice * Method/Device: Drilling/drill rig (DRILL) * Comment: GISP2 is a combination of the shallow B and the deeper D core; about 200 ka
Visible-stratigraphic log of the upper part of the GISP2 ice core, based on observations by R.B. Alley in the Holocene and Alley and C.A. Shuman in the late glacial, as compiled by G. Spinelli
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, ice/snowDepth ice/snowmGeocode
2AGEAgeka BPGeocode
3Accumulation of snow/ice per yearAcc ratecm/aAlley, Richard Bsee commentAccumulation from the previous (next shallower or younger or higher in the data file) summer pick, confidence (3=strong indication of summer observed, lower numbers indicate less confidence, and 0 indicates an interpolation because of core loss or poor core quality), depth in m in the core at which the summer indicator was observed. These are approximately, though not exactly, the data in Alley et al. (1993). Accumulation was calculated as in that paper and is not updated to reflect the more-recent work of Cuffey, Bolzan and Nereson, et al. Depth is in the B core down through year 517, and in the D core deeper. The switch from B to D is based on the visual data and interpretation of electrical measurements by Kendrick Taylor. All observations are visible, and were made by R.B. Alley down into the Younger Dryas (younger than about 11700 bp), and then by Alley and C.A. Shuman below that. Notice that this is not the official depth-age scale, nor the most accurate possible depth-age scale. As described in the JGR paper, the official scale includes changes in technique at various depths, and those changes may have affected the estimated variability of the accumulation-rate reconstructions. This is the most consistent time scale we have developed to date, not the most accurate.
4ConfidenceConfAlley, Richard Bsee comment
34960 data points

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