Warm Nordic Seas delayed glacial inception in Scandinavia 1Bjerknes Centre for Climate Research, Bergen, Norway
20 Dec 2010
2Geophysical Institute, University of Bergen, Bergen, Norway
3Laboratoire des Sciences du Climat et l'Environnement, Gif sur Yvette, France
4UNI Research, Bergen, Norway
*now at: Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland
Received: 07 Jul 2010 – Published in Clim. Past Discuss.: 13 Aug 2010Abstract. We simulate the last glacial inception, 115 000 years ago, with a three
dimensional thermomechanical ice sheet model of the Northern Hemisphere,
forced by a comprehensive coupled climate model. High oceanic heat transport
into the Nordic Seas prevents large scale ice growth over Scandinavia.
Glacial inception in the region starts on the highest mountains in the south
when sea surface temperatures in the Nordic Seas are reduced by at least
3 °C. Ice growth in Northern Scandinavia requires a cooling by at
least 4 °C. This is in good agreement with marine proxy data from the
Nordic Seas and North Atlantic as well as available terrestrial data. This
study thus provides a physical understanding and revised timing of the first
glacier advance over Scandinavia.
Revised: 22 Nov 2010 – Accepted: 13 Dec 2010 – Published: 20 Dec 2010
Citation: Born, A., Kageyama, M., and Nisancioglu, K. H.: Warm Nordic Seas delayed glacial inception in Scandinavia, Clim. Past, 6, 817-826, doi:10.5194/cp-6-817-2010, 2010.