GCM ANALYSIS OF LOCAL INFLUENCES ON ICE CORE DELTA-SIGNALS

A high resolution GCM is used to examine the effect of changes in loca l surface climate parameters on the ice sheets that can influence the interpretation of the isotopic signal of the ice from deep cores. The model suggests that the 10 degrees C difference between the LGM surfac e temperature deduced from borehole thermometry and that deduced from the water isotope analysis to a great extent may be due to a modificat ion of the precipitation seasonality in central Greenland. For central East Antarctica, the model tends to suggest a weak opposite bias.