Subaqueous melting of Store Glacier, west Greenland from three‐dimensional, high‐resolution numerical modeling and ocean observations
Subaqueous melting of Store Glacier, west Greenland from three‐dimensional, high‐resolution numerical modeling and ocean observations
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根据三维、高分辨率数值模型和海洋观测，格陵兰岛西部斯托尔冰川的水下融化
DOI：
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发表时间：
2013
影响因子：
5.2
通讯作者：
M. Flexas
中科院分区：
文献类型：
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作者：
Yun Xu;E. Rignot;I. Fenty;D. Menemenlis;M. Flexas
我们利用麻省理工学院的通用环流模型，对西格陵兰岛的一个入海冰川——斯托尔冰川的崩解面处的冰融化进行了三维高分辨率模拟。我们将模拟的冰融化情况与从海洋学数据得出的估计值进行了比较。模拟结果显示，富含淡水的羽流沿冰面湍流上升和扩散，冰以每天数米的速度剧烈融化。2010年8月模拟的融化速率为2.0±0.3米/天，在根据海洋学数据计算出的3.0±1.0米/天的融化速率的不确定范围内。融化在冰下通道上方的深处最为强烈，导致冰川底部被侵蚀。融化速率与热强迫的1.2 - 1.6次方以及冰下水流通量的0.5 - 0.9次方成正比。因此，在气候变暖的情况下，斯托尔冰川因海洋而产生的融化可能会因海洋温度升高和冰下排水量增加而加剧。
We present three‐dimensional, high‐resolution simulations of ice melting at the calving face of Store Glacier, a tidewater glacier in West Greenland, using the Massachusetts Institute of Technology general circulation model. We compare the simulated ice melt with an estimate derived from oceanographic data. The simulations show turbulent upwelling and spreading of the freshwater‐laden plume along the ice face and the vigorous melting of ice at rates of meters per day. The simulated August 2010 melt rate of 2.0±0.3 m/d is within uncertainties of the melt rate of 3.0±1.0 m/d calculated from oceanographic data. Melting is greatest at depth, above the subglacial channels, causing glacier undercutting. Melt rates increase proportionally to thermal forcing raised to the power of 1.2–1.6 and to subglacial water flux raised to the power of 0.5–0.9. Therefore, in a warmer climate, Store Glacier melting by ocean may increase from both increased ocean temperature and subglacial discharge.