caa a22 4500 465814662 CHVBK 20180323112124.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF00195850 doi (NATIONALLICENCE)springer-10.1007/BF00195850 A sensitivity experiment for the removal of Arctic sea ice with the French spectral general circulation model [Elektronische Daten] [J. Royer, S. Planton, M. Déqué] Sea ice has a major influence on climate in high latitudes. In this paper we analyzed the impact of removal of Arctic sea-ice cover on the climate simulated by a T42 20-level version of the French spectral model "Emeraude”. The control experiment was the second winter of an annual cycle simulation of the present climate. In the perturbed simulation the Arctic sea-ice cover was replaced by open ocean maintained at the freezing temperature of sea water. The zonal mean patterns of the model response were found to be in good agreement with earlier simulations of Fletcher et al. and Warshaw and Rapp. The atmospheric warming, caused by the increase of upward fluxes of sensible and latent heat and of longwave radiation from the ice-free ocean surface, is largely limited to the high latitudes poleward of 70° N and the lower half of the troposphere and leads to a surface pressure decrease and a precipitation increase over this area. We also analyze the geographical distribution of the response and the mechanisms that can explain the simulated cooling over Eurasia in relation to the energy budget at the surface. Finally, we discuss the reduction of cloud cover over the ice-free Arctic, which was an unexpected result of our simulation, and conclude that further studies are necessary to resolve the question of cumulus convection and cloud process parameterization in high latitudes. Springer-Verlag, 1990 Royer J. Centre National de Recherches Météorologiques (DMN), 42, avenue G. Coriolis, F-37057, Toulouse Cédex, France aut Planton S. Centre National de Recherches Météorologiques (DMN), 42, avenue G. Coriolis, F-37057, Toulouse Cédex, France aut Déqué M. Centre National de Recherches Météorologiques (DMN), 42, avenue G. Coriolis, F-37057, Toulouse Cédex, France aut Climate Dynamics Springer-Verlag 5/1(1990-11-01), 1-17 0930-7575 5:1<1 1990 5 382 https://doi.org/10.1007/BF00195850 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00195850 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Royer J. Centre National de Recherches Météorologiques (DMN), 42, avenue G. Coriolis, F-37057, Toulouse Cédex, France aut NATIONALLICENCE 700 1- Planton S. Centre National de Recherches Météorologiques (DMN), 42, avenue G. Coriolis, F-37057, Toulouse Cédex, France aut NATIONALLICENCE 700 1- Déqué M. Centre National de Recherches Météorologiques (DMN), 42, avenue G. Coriolis, F-37057, Toulouse Cédex, France aut NATIONALLICENCE 773 0- Climate Dynamics Springer-Verlag 5/1(1990-11-01), 1-17 0930-7575 5:1<1 1990 5 382 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer