limite climatique de la neige

CONT: La «limite climatique» des neiges est [...] un concept théorique. C'est la limite topographique que l'on observerait sur un sol sensiblement horizontal, ni particulièrement exposé ni particulièrement abrité du vent, et non abrité du soleil. Autrement dit, il ne doit pas dépendre de la topographie de la région mais uniquement de son climat.

CONT: The term ""transient"" snowline is referred to as the boundary between a snow-covered surface and a bare surface at any given time ... The transient snowline may reside on the ground as well as on the surface of a glacier. It is continuously changing, being near sea level during winter in some locations, or on the highest mountain slopes in the summer. The final height of the transient snowline at the end of the melting season will vary from year to year depending on changes in precipitation and temperatures. The term ""climatic"" snowline is given to the average elevation of the highest transient snowline on bare ground for a number of years.
OBS: Below this altitude ablation would predominate.