Abstract151 – University of Copenhagen

Past accumulation rates derived from observed annual layers in the GRIP ice core from Summit, central Greenland 

In Peltier, W.R., ed. Ice in the Climate System. Berlin Heidelberg: Springer-Verlag, 517-532., 1993. 

D. Dahl-Jensen, S.J. Johnsen, C.U. Hammer and H.B. Clausen
Geofysisk Afdeling, Niels Bohr Instituttet for Astronomi, Fysik og Geofysik, Københavns Universitet
J. Jouzel

Based on dated reference horizons down to 1623 m an ice flow model has been developed. The model is used to reconstruct past accumulation rates from the sequences of detected annual layers in the upper 2321 m of the 3029 m deep GRIP ice core. Comparison of these past time accumulation rates with the corresponding delta180 values show a strong correlation. This relationship can be used in a non steady state flow model, in which past accumulation rates, deduced from the continuous delta180 record, are used to model a time scale. The hereby determined time scale and the modelled annual layers compare well with the observed data.