ablation
noun uk/əˈbleɪ.ʃən/ us/ˌæbˈleɪ.ʃən/
(OF ICE OR ROCK)
[ U ] environment, geology specialized（冰川、冰山）消融;（岩石等物质）融蚀、水蚀
the loss of ice or snow from a glacier or iceberg, or the loss of rock or similar material, caused by a process such as melting or erosion (= gradual damage and removing by waves, rain, or wind)
Annual measurements have revealed that ice motion and ablation are not uniform from place to place or from year to year.