Mass balance of the Sør Rondane glacial system, East Antarctica
Mass balance of the Sør Rondane glacial system, East Antarctica
复制标题
东南极洲 Sør Rondane 冰川系统的质量平衡
作者：
D. Callens;Nicolas Thonnard;J. Lenaerts;J. M. van Wessem;W. J. van de Berg;K. Matsuoka;F. Pattyn
摘要 极地冰盖的质量变化具有重要的社会影响，因为它们会影响全球海平面。估计冰盖当前的质量预算相当于确定降水导致的表面质量增加与接地线流出量之间的平衡。对于南极冰盖，接地线流出受海洋过程和出口冰川动力学控制。在这项研究中，我们使用输入/输出方法计算了南极冰盖东部德隆宁莫德地段主要出口冰川的质量预算。输入由整个流域的最近表面积累估计（SMB）给出。接地线处的流出量是根据最近机载测量的雷达数据和基于卫星的速度使用塞流和简单剪切相结合的流动模型确定的。这种方法是对以前研究的改进，因为冰厚度是测量的，而不是根据静水平衡来估计的。与该区域冰盖普遍增厚一致，我们根据最新的 SMB 模型结果估计该区域的区域质量平衡为 3.15 ± 8.23 Gt a−1。
Abstract Mass changes of polar ice sheets have an important societal impact, because they affect global sea level. Estimating the current mass budget of ice sheets is equivalent to determining the balance between surface mass gain through precipitation and outflow across the grounding line. For the Antarctic ice sheet, grounding line outflow is governed by oceanic processes and outlet glacier dynamics. In this study, we compute the mass budget of major outlet glaciers in the eastern Dronning Maud Land sector of the Antarctic ice sheet using the input/output method. Input is given by recent surface accumulation estimates (SMB) of the whole drainage basin. The outflow at the grounding line is determined from the radar data of a recent airborne survey and satellite-based velocities using a flow model of combined plug flow and simple shear. This approach is an improvement on previous studies, as the ice thickness is measured, rather than being estimated from hydrostatic equilibrium. In line with the general thickening of the ice sheet over this sector, we estimate the regional mass balance in this area at 3.15 ± 8.23 Gt a−1 according to the most recent SMB model results.
影响因子：
18.3
作者：
Rignot, Eric;Bamber, Jonathan L.;Van Meijgaard, Erik
通讯作者：
Van Meijgaard, Erik