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Summer surface melt thins Petermann Gletscher Ice Shelf by enhancing channelized basal melt
Journal of Glaciology ( IF 3.4 ) Pub Date : 2019-07-09 , DOI: 10.1017/jog.2019.43
Peter Washam 1 , Keith W Nicholls 2 , Andreas Mühow 1 , Laurie Padman 3
Affiliation  

Increasing ocean and air temperatures have contributed to the removal of floating ice shelves from several Greenland outlet glaciers; however, the specific contribution of these external forcings remains poorly understood. Here we use atmospheric, oceanographic and glaciological time series data from the ice shelf of Petermann Gletscher, NW Greenland to quantify the forcing of the ocean and atmosphere on the ice shelf at a site ~16 km from the grounding line within a large sub-ice-shelf channel. Basal melt rates here indicate a strong seasonality, rising from a winter mean of 2 m a−1 to a maximum of 80 m a−1 during the summer melt season. This increase in basal melt rates confirms the direct link between summer atmospheric warming around Greenland and enhanced ocean-forced melting of its remaining ice shelves. We attribute this enhanced melting to increased discharge of subglacial runoff into the ocean at the grounding line, which strengthens under-ice currents and drives a greater ocean heat flux toward the ice base.

中文翻译:

夏季表面融化通过增强通道化基础融化使彼得曼格莱彻冰架变薄

海洋和气温的升高导致几个格陵兰出口冰川的浮冰架消失;然而,这些外部强迫的具体贡献仍然知之甚少。在这里,我们使用来自格陵兰西北部 Petermann Gletscher 冰架的大气、海洋学和冰川学时间序列数据来量化海洋和大气对冰架上的强迫,该地点距离大型亚冰内的接地线约 16 公里-货架渠道。这里的基础融化率表明季节性很强,从 2 ma 的冬季平均值上升-1最大 80 毫安-1在夏季融化季节。基础融化率的增加证实了格陵兰周围夏季大气变暖与其剩余冰架的海洋强迫融化之间的直接联系。我们将这种增强的融化归因于冰下径流在接地线处排放到海洋中的增加,这加强了冰下洋流并推动更大的海洋热通量流向冰基。
更新日期:2019-07-09
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