One factor could be deposits of dust and black carbon (collectively called aerosols) upon the snow, which, up to an accumulation of 400 grams per square meter sharply raises the rate of melting. Between 400 and 600 grams, it has no further effect, but when it exceeds 600 grams, it acts as a shield against the sun, and slows down melting.
是什么导致冰舌中止后退的呢？一个因素可能是积雪表面尘埃和黑碳（统称气溶胶）的沉降密度。气溶胶沉降密度为每平方米 400 克，会导致冰舌迅速融化。每平方米 400 克至 600 克之间，无明显效应。高于每平方米 600 克，则仿佛给冰舌盖上了一层抵挡阳光的罩子，从而使融化速度放缓。