Sensitivity of Northern Hemispheric continental ice sheets to tropical SST during deglaciation

Keith Rodgers (1) , Sylvie Charbit (1, 2) , Masa Kageyama (1, 2) , Gwenaëlle Philippon (1) , Gilles Ramstein (1, 2) , Catherine Ritz (3) , Jeffrey Yin (4) , Gerrit Lohmann (5) , Stephan Lorenz (6) , Myriam Khodri (7)

1 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
2 CLIM - Modélisation du climat
3 LGGE - Laboratoire de glaciologie et géophysique de l'environnement
4 NOAA-CIRES Climate Diagnostics Center
5 MARUM - Center for Marine Environmental Sciences [Bremen]
6 MPI-M - Max-Planck-Institut für Meteorologie
7 LDEO - Lamont-Doherty Earth Observatory

A thermomechanical ice sheet model (ISM) is used to investigate the sensitivity of the Laurentide and Fennoscandian ice sheets to tropical sea surface temperature (SST) perturbations during deglaciation. The ISM is driven by surface temperature and precipitation fields from three different atmospheric general circulation models (AGCMs). For each AGCM, the responses in temperature and precipitation over the ice sheets nearly compensate, such that ice sheet mass balance is not strongly sensitive to tropical SST boundary conditions. It was also found that there is significant variation in the response of the ISM to the different AGCM output fields.

Domaines: Océan, Atmosphère; Interfaces continentales, environnement

Keith Rodgers, Sylvie Charbit, Masa Kageyama, Gwenaëlle Philippon, Gilles Ramstein, et al.. Sensitivity of Northern Hemispheric continental ice sheets to tropical SST during deglaciation. Geophysical Research Letters, 2004, 31 (2), ⟨10.1029/2003GL018375⟩. ⟨hal-02930158⟩