ABSTRACT. The heat exchange takes place in two stages : (i) the a tmospheric heat causes melting of the whole of the annual snow accumulation and leads to the formation of s lush rivers; (ii) some of the melt water refreezes to form a new layer of ice superimposed on the original ice, which is warmed by the latent h eat yielded to it. A theoretical estimate of the rate of formation of the superimposed ice, and of the temperature change in the original . ice, is given, which agrees reasonably with the actual measurements. A rough measurement of the melt water run-ofl' checks with the observations of ablation and superimposed ice . The total energy available for melting is estimated approximately from the meteorological observations; it under estimates the actual ablation. About 70 per cent of the total ablation energy (47 cm. water, total ablation) is disposed of as melt water that is discharged from the ice cap s urface; the remainder goes as sensible heat to the low temperature ice.REsUM E. L'echange de chaleur a lieu en deux phases: (i) la chaleur de l'atmosphere fait fondre la neige accumulee au cours de l'annee et cause la formation de rivieres de boue glacee; (ii) une partie de l'eau de fusion gele a nouveau et forme une nouveUe couche de glace superposee it la premiere, IaqueUe est rechauffee par la chaleur latente qui lui est transmise. L 'article d onne une estimation theorique de la raison it laquelle se forme la couche de glace superposee et du changement de temperature dans la premiere glace; cette estimation s'accorde assez bien avec les resultats provenant de mesures reeUes. La mesure approximative des ruisseUements d e I' eau de fusion permet verifier les observations concernant l'ablation et la cou c he de glace superposee. L'energie totale dis ponible pour l'ablation est estimee approximativement it partir des d onnees meteorologiques; le resu ltat sous-estime l'ablation reeUe. Environ 70 pour cent de l'energie totale d 'ablati on (ablation totale de 47 cm. d'eau) est absorbee par l'eau de fusion ruisselant de la surface d e la calotte de glace, le r est e est transmis sous forme de chaleur sensible it la glace de basse temperature.
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