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New data.

This image is based on GRIP data file

http://www.iceandclimate.nbi.ku.dk/data/GICC05modelext_GRIP_and_GISP2_and_resampled_data_series_Seierstad_et_al._2014_version_10Dec2014-2.xlsx

File is processed and drawn with scidavis.

NGRIP, GRIP and GISP2 δ18O and calcium concentration in 20 yrs means on the GICC05modelext timescale

References for the δ18O data and Ca data are listed below. Please see sheet no. 1 for further details and for references for the GICC05modelext timescale.


d18O data:

Grootes, P.M., Stuiver, M., 1997. Oxygen 18/16 variability in Greenland snow and ice with 10-3- to 105-year time resolution. Journal of Geophysical Research 102, 26455-26470.

Johnsen, S.J., Clausen, H.B., Dansgaard, W., Gundestrup, N.S., Hammer, C.U., Andersen, U., Andersen, K.K., Hvidberg, C.S., Dahl-Jensen, D., Steffensen, J.P., Shoji, H., Sveinbjörnsdóttir, Á.E., White, J., Jouzel, J., Fisher, D., 1997. The δ18O record along the Greenland Ice Core Project deep ice core and the problem of possible Eemian climatic instability. Journal of Geophysical Research 102, 26397-26410.

North Greenland Ice Core Project members, 2004. High-resolution record of Northern Hemisphere climate extending into the last interglacial period. Nature 431, 147-151.

Stuiver, M., Grootes, P.M., 2000. GISP2 oxygen isotope ratios. Quaternary Research 53, 277-284.

Old data

This is temperature-related oxygen isotope data curve between 13000-9000 BP-(11th millennium to 7th millennium BC). It is based on NGRIP Greenland ice core data.

YD, Younger Dryas PB, Beginning of preboreal PBO, Pre-Boreal Oscillation

This file is based to file NGRIPD180.txt, that contains ss09sea age and Del 18O.

Supplementary Data to
NGRIP Members, Nature 431, 147 - 151 (09 September 2004); doi:10.1038/nature02805


High resolution Climate Record of the Northern Hemisphere back into the last Interglacial Period

North Greenland Ice-Core Project (NorthGRIP) Members

In this text file we list the NGRIP oxygen 18 values as 50 year mean values
using the same preliminary age scale as in Figure 2c of the accompanying paper.
Data was measured against VSMOW at the Niels Bohr Institute for Astronomy, 
Physics and Geophysics, Department of Geophysics, University of Copenhagen.  
Accuracy of individual measurements is 0.07 %. 
The initial isotope data series is based on 5 cm continuous sampling from
surface to bottom of the core, or 61100 individual measurements.
Improved dating of the NGRIP core and additional data will be posted on 
our web site http://www.glaciology.gfy.ku.dk/ngrip/index_eng.htm when 
it becomes available.

Copenhagen June 6, 2004.
Sigfus J. Johnsen <sigfus@gfy.ku.dk>.


ss09sea age       Del 18O
years BP 2000	permille