GCM analysis of local influences on ice core delta signals

Gerhard Krinner (1) , Christophe Genthon (1) , Jean Jouzel (2)

1 LGGE - Laboratoire de glaciologie et géophysique de l'environnement
2 LMCE - Laboratoire de Modélisation du Climat et de l'Environnement

A high resolution GCM is used to examine the effect of changes in local 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 10øC difference between the LGM surface temperature deduced from borehole thermometry and that deduced from the water isotope analysis to a great extent may be due to a modification of the precipitation seasonality in central Greenland. For central East Antarctica, the model tends to suggest a weak opposite bias.

Domaines: Océan, Atmosphère; Interfaces continentales, environnement

Gerhard Krinner, Christophe Genthon, Jean Jouzel. GCM analysis of local influences on ice core delta signals. Geophysical Research Letters, 1997, 24 (22), pp.2825-2828. ⟨10.1029/97GL52891⟩. ⟨hal-03335004⟩