Large ice loss variability at Nioghalvfjerdsfjorden Glacier, Northeast-Greenland.
Large ice loss variability at Nioghalvfjerdsfjorden Glacier, Northeast-Greenland.
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DOI：
10.1038/s41467-018-05180-x
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发表时间：
2018-07-17
影响因子：
16.6
通讯作者：
Schannwell C
中科院分区：
文献类型：
--
作者：
Mayer C;Schaffer J;Hattermann T;Floricioiu D;Krieger L;Dodd PA;Kanzow T;Licciulli C;Schannwell C
Nioghalvfjerdsfjorden是格陵兰东北部的一个主要出口冰川。虽然早期的研究表明，在1999年至2014年期间，接地线附近的漂浮部分变薄了30%，但时间冰损失演变，其与外部强迫的关系以及对接地冰盖的影响仍然很不清楚。通过结合观测的表面特征，冰厚度和基岩数据，我们发现，自2001年以来，冰架质量平衡已经失去平衡，变薄率在年度/多年的时间尺度上变化很大。冰通量和表面消融的变化太小，不可能产生这种变化。海洋热通量的增加是观测到的变薄的最合理的原因。在持续的环境条件下，冰架将在几十年内失去大部分面积，冰模拟显示，接地线上游的变薄程度显着，但局部有限。在过去的几十年里，格陵兰冰盖的质量不断减少，但格陵兰东北部冰川的贡献很难量化。在这里，作者表明，至少自2001年以来，79号北冰川的漂浮部分一直在不断损失质量，每年的变化非常大。
Nioghalvfjerdsfjorden is a major outlet glacier in Northeast-Greenland. Although earlier studies showed that the floating part near the grounding line thinned by 30% between 1999 and 2014, the temporal ice loss evolution, its relation to external forcing and the implications for the grounded ice sheet remain largely unclear. By combining observations of surface features, ice thickness and bedrock data, we find that the ice shelf mass balance has been out of equilibrium since 2001, with large variations of the thinning rates on annual/multiannual time scales. Changes in ice flux and surface ablation are too small to produce this variability. An increased ocean heat flux is the most plausible cause of the observed thinning. For sustained environmental conditions, the ice shelf will lose large parts of its area within a few decades and ice modeling shows a significant, but locally restricted thinning upstream of the grounding line in response. The Greenland Ice Sheet has increasingly lost mass over the past few decades, yet the contribution from glaciers in Northeast Greenland is difficult to quantify. Here, the authors show that the floating part of 79 North Glacier has continuously lost mass since at least 2001, with a very high annual variability.
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