The Possible Transition From Glacial Surge to Ice Stream on Vavilov Ice Cap

The Possible Transition From Glacial Surge to Ice Stream on Vavilov Ice Cap
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瓦维洛夫冰盖上从冰川涌动到冰流的可能转变

DOI:
10.1029/2019gl084948
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发表时间:
2019
影响因子:
5.2
通讯作者:
L. Stearns
L. Stearns
中科院分区:
地球科学1区
文献类型:
--
作者:
Whyjay Zheng;M. Pritchard;M. Willis;L. Stearns

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浪涌型冰川通常由于质量积累而经历周期性流动不稳定性;然而,最近的一些冰川浪涌在短时间内造成了不可逆转的冰损失。在俄罗斯的瓦维洛夫冰帽,类似浪涌的行为始于2013年,到2019年春天,冰帽已经失去了9.5 Gt的冰(整个盆地的11%)。利用卫星光学和合成孔径雷达图像获得的表面高程和冰川速度的时间序列,我们确定了从2017年开始的流动模式的转变,当时在地面海洋皮埃蒙特扇内形成剪切边缘。多个夏季加速与2015-2019年期间温暖的夏季相关,并表明表面融化可能进入冰下环境。力平衡分析和Péclet数的检查表明,冰川变薄在2016-2017年向上游传播,扩散成为对变薄扰动的重要动态响应。我们的研究结果表明,冰川已经进入了一个新的冰流状状态。
Surge‐type glaciers typically undergo cyclical flow instability due to mass accumulation; however, some recent glacier surges have caused irreversible ice loss in a short period. At Vavilov Ice Cap, Russia, surge‐like behavior initiated in 2013 and by spring 2019 the ice cap had lost 9.5 Gt of ice (11% mass of the entire basin). Using time series of surface elevation and glacier velocity derived from satellite optical and synthetic‐aperture radar imagery, we identify a shift of flow pattern starting in 2017 when shear margins formed within the grounded marine piedmont fan. Multiple summer speedups correlate with warmer summers during 2015–2019 and suggest that surface melt may access the subglacial environment. Force balance analysis and examination of the Péclet number show that glacier thinning propagated upstream in 2016–2017, and diffusion became a significant dynamic response to thinning perturbations. Our results suggest that the glacier has entered a new ice stream‐like regime.
DOI: 10.1002/2016jf004133
发表时间: 2017-09-01
影响因子: 3.9
作者:
Kehrl, L. M.;Joughin, I.;Krieger, L.
通讯作者: Krieger, L.
DOI: 10.3390/rs9040388
发表时间: 2017-04
期刊: Remote. Sens.
影响因子: --
作者:
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