Retention of Greenland runoff by refreezing: Implications for projected future sea level change
Retention of Greenland runoff by refreezing: Implications for projected future sea level change
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通过重新冻结保留格陵兰岛径流：对预计未来海平面变化的影响
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
T. Illangasekare
中科院分区：
文献类型：
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作者：
W. Pfeffer;M. Meier;T. Illangasekare
低于冰点的可渗透冰晶表面产生的熔化不会自由渗透，而是在其原点附近重新冻结，从而提高了冰晶温度并减少了孔隙空间。如果引入足够的融水，冰层将升温至 0°C，随后的水将填充剩余的孔隙空间而不会结冰。只有超过了冰浆的残余水含量后，水才会流过冰浆并可能作为径流逸出。这一过程阻止了夏季北极高海拔冰川和冰盖的融化完全逃逸，并且在基于表面能量平衡的冰川径流建模中必须考虑到这一过程。这里提出的模型以简单的方式描述了未来气候变暖中渗透、再冻结和径流的瞬态过程。该模型适用于格陵兰岛，在不考虑再冻结过程的情况下，对径流引起的海平面上升的预测在 150 年内可能会高出 5.0 厘米。
Melting produced at the surface of subfreezing permeable firn does not freely percolate but instead refreezes near its point of origin, raising the firn temperature and decreasing the pore space. If sufficient meltwater is introduced, the firn will warm to 0°C, and subsequent water will fill the remaining pore space without freezing. Only after the residual water content of the firn is exceeded will water flow through the firn and possibly escape as runoff. This process prevents summer melt on high Arctic glaciers and ice caps from escaping in its entirety, and it must be accounted for in modeling glacier runoff on the basis of surface energy balance. A model is presented here which describes in a simple way the transient process of infiltration, refreezing, and runoff in a future warming climate. The model is applied to Greenland, for which predictions of runoff-induced sea level rise that do not consider the refreezing process could be as much as 5.0 cm too high over 150 years.