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雪线是指常年积雪的下界,即年降雪量与年消融量相等的平衡线。在此高度以上,全年冰雪的补给量大于消融量,形成常年积雪区;此高度以下,全年冰雪的补给量小于消融量,积累不了多年积雪,形成季节性积雪区。简言之,雪线就是地球陆地高山常年积雪区和季节积雪
Snow line refers to the lower bound of perennial snow cover, that is, the balance of annual snowfall and annual ablation volume is equal. Above this altitude, annual recharge of snow and ice is greater than the amount of ablation to form perennial snow-covered area. Below this height, annual snow and ice recharge is less than ablation volume and can not accumulate snow for many years to form a seasonal snow-covered area. In short, the snow line is the Earth’s snow-capped mountains perennial and season snow cover