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The development of large continental-scale ice sheets over Canada andnorthern Europe during the last glacial cycle likely modified the track ofstationary waves and influenced the location of growing ice sheets throughchanges in accumulation and temperature patterns. Although they are oftenmentioned in the literature, these feedback mechanisms are poorly constrainedand have never been studied throughout an entire glacial–interglacial cycle.Using the climate model of intermediate complexity CLIMBER-2 coupled with the3-D ice-sheet model GRISLI (GRenoble Ice Shelf and Land Ice model), we investigate the impact of stationary waves onthe construction of past Northern Hemisphere ice sheets during the pastglaciation. The stationary waves are not explicitly computed in the model buttheir effect on sea-level pressure is parameterized. We tested differentparameterizations to study separately the effect of surface temperature(thermal forcing) and topography (orographic forcing) on sea-level pressure,and therefore on atmospheric circulation and ice-sheet surface mass balance.Our model results suggest that the response of ice sheets to thermal and/ororographic forcings is rather different. At the beginning of the glaciation,the orographic effect favors the growth of the Laurentide ice sheet, whereasFennoscandia appears rather sensitive to the thermal effect. Using theablation parameterization as a trigger to artificially modify the size of oneice sheet, the remote influence of one ice sheet on the other is also studiedas a function of the stationary wave parameterizations. The sensitivity ofremote ice sheets is shown to be highly sensitive to the choice of theseparameterizations with a larger response when orographic effect is accountedfor. Results presented in this study suggest that the various spatialdistributions of ice sheets could be partly explained by the feedbackmechanisms occurring between ice sheets and atmospheric circulation

Interdependence of the growth of the Northern Hemisphere ice sheets during the last glaciation: the role of atmospheric circulation