Analysis of Antarctic Peninsula glacier frontal ablation rates with respect to iceberg melt-inferred variability in ocean conditions
Analysis of Antarctic Peninsula glacier frontal ablation rates with respect to iceberg melt-inferred variability in ocean conditions
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DOI：
10.1017/jog.2020.21
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发表时间：
2020-04
影响因子：
3.4
通讯作者：
M. Dryak;E. Enderlin
中科院分区：
文献类型：
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作者：
M. Dryak;E. Enderlin
近几十年来，南极半岛（AP）上的海洋终止冰川已经退缩，加速和变薄，以应对气候变化。海洋变暖被认为是冰川动力学变化的触发因素，但在冰川终点附近几乎没有数据可以评估海洋变暖的作用。我们使用2013年至2019年期间东部两个冰川和西部六个冰川的遥感冰山融化率来探索海洋条件变化与冰川锋面消融之间的联系。我们发现，冰山融化率随区域海洋温度变化而变化，西部的卡德曼冰川和威德森冰川融化率最高（平均为10 cm d−1），东部的起重机冰川融化率最低（平均为0.5 cm d−1）。从2014年到2018年，几乎一致的冰川锋面消融速率从埃奇沃思和布兰查德冰川的约450 m a−1到前沃迪冰架支流塞勒冰川的约3000 m a−1不等。在AP附近，冰山融化率和冰川锋面消融率的变化显著正相关（斯皮尔曼的ρ = 0.71，p值= 0.003）。我们解释这种相关性作为支持以前的研究表明，冰川终端的海底融化施加控制周围的AP冰川锋面动力学。
Marine-terminating glaciers on the Antarctic Peninsula (AP) have retreated, accelerated and thinned in response to climate change in recent decades. Ocean warming has been implicated as a trigger for these changes in glacier dynamics, yet little data exist near glacier termini to assess the role of ocean warming here. We use remotely-sensed iceberg melt rates seaward of two glaciers on the eastern and six glaciers on the western AP from 2013 to 2019 to explore connections between variations in ocean conditions and glacier frontal ablation. We find iceberg melt rates follow regional ocean temperature variations, with the highest melt rates (mean ≈ 10 cm d−1) at Cadman and Widdowson glaciers in the west and the lowest melt rates (mean ≈ 0.5 cm d−1) at Crane Glacier in the east. Near-coincident glacier frontal ablation rates from 2014 to 2018 vary from ~450 m a−1 at Edgeworth and Blanchard glaciers to ~3000 m a−1 at Seller Glacier, former Wordie Ice Shelf tributary. Variations in iceberg melt rates and glacier frontal ablation rates are significantly positively correlated around the AP (Spearman's ρ = 0.71, p-value = 0.003). We interpret this correlation as support for previous research suggesting submarine melting of glacier termini exerts control on glacier frontal dynamics around the AP.