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Geospatial investigation on transitional (quiescence to surge initiation) phase dynamics of Monacobreen tidewater glacier, Svalbard
Advances in Space Research ( IF 2.8 ) Pub Date : 2021-08-23 , DOI: 10.1016/j.asr.2021.08.020
Debangshu Banerjee 1 , Vaibhav Garg 2 , Praveen K. Thakur 2
Affiliation  

The change in the phase, from quiescence to surge, may perturb the glacier’s dynamical behavior. To understand these changes through geospatial technique, the fastest moving tidewater Monacobreen Glacier, Svalbard, was studied for the year 2016–2019. It was elucidated that the surge had initiated during 2017–2018 before it the glacier was in quiescence since 2001. Initially, the glacier radar zones, namely percolation refreeze, lower percolation, and clean ice, were identified using the multi-temporal SAR data. These zones were utilized to delineate the equilibrium line altitude, and it was found that it is continuously moving down during surging, unlike the quiescence phase. The accumulation area ratio was always more than 0.67 throughout the analysis. The seasonal change in glacier surface velocity for both the phases was estimated, adapting the most appropriate Offset Tracking approach using the SAR data. The mean velocity over the main trunk was found to vary from 0.5 to 4 m/day. Thereafter, Glen's flow law equation was used to estimate the ice-thickness and found that the glacier has an average thickness range of 216–326 m in quiescence and 136–244 m during the surging. The analysis depicted that the basal shear stresses are increasing with surging, and the viscosity is decreasing. It can be said that the transition of the glacier from quiescent to surging phase has entirely changed its dynamic behavior and characteristics. Further, in the absence of field observations, the geospatial technique may provide reasonable estimates of the glacier’s physical and dynamical parameters.



中文翻译:

斯瓦尔巴群岛摩纳哥布林潮水冰川过渡(静止到浪涌开始)相动力学的地理空间研究

从静止到激增的阶段变化可能会扰乱冰川的动态行为。为了通过地理空间技术了解这些变化,研究了 2016-2019 年移动速度最快的潮水斯瓦尔巴群岛莫纳科布林冰川。研究表明,在冰川自 2001 年以来处于静止状态之前,激增是在 2017-2018 年开始的。最初,使用多时相 SAR 数据确定了冰川雷达区,即渗流再冻结、低渗流和净冰。这些区域被用来描绘平衡线高度,并且发现它在涌动期间不断向下移动,与静止阶段不同。在整个分析过程中,堆积面积比始终大于 0.67。估计了两个阶段的冰川表面速度的季节性变化,使用 SAR 数据调整最合适的偏移跟踪方法。发现主干上的平均速度在 0.5 到 4 m/天之间变化。此后,利用格伦流动定律方程估算冰层厚度,发现冰川在静止期平均厚度范围为216-326 m,在涌动期平均厚度范围为136-244 m。分析表明,基础剪切应力随着浪涌而增加,而粘度正在降低。可以说,冰川从静止阶段向涌动阶段的转变,完全改变了它的动态行为和特征。此外,在没有实地观察的情况下,地理空间技术可以提供对冰川物理和动力学参数的合理估计。发现主干上的平均速度在 0.5 到 4 m/天之间变化。此后,利用格伦流动定律方程估算冰层厚度,发现冰川在静止期平均厚度范围为216-326 m,在涌动期平均厚度范围为136-244 m。分析表明,基础剪切应力随着浪涌而增加,而粘度正在降低。可以说,冰川从静止阶段向涌动阶段的转变,完全改变了它的动态行为和特征。此外,在没有实地观察的情况下,地理空间技术可以提供对冰川物理和动力学参数的合理估计。发现主干上的平均速度在 0.5 到 4 m/天之间变化。此后,利用格伦流动定律方程估算冰层厚度,发现冰川在静止期平均厚度范围为216-326 m,在涌动期平均厚度范围为136-244 m。分析表明,基础剪切应力随着浪涌而增加,而粘度正在降低。可以说,冰川从静止阶段向涌动阶段的转变,完全改变了它的动态行为和特征。此外,在没有实地观察的情况下,地理空间技术可以提供对冰川物理和动力学参数的合理估计。采用流动定律方程估算冰层厚度,发现冰川静止期平均厚度范围为216~326 m,激荡期平均厚度范围为136~244 m。分析表明,基础剪切应力随着浪涌而增加,而粘度正在降低。可以说,冰川从静止阶段向涌动阶段的转变,完全改变了它的动态行为和特征。此外,在没有实地观察的情况下,地理空间技术可以提供对冰川物理和动力学参数的合理估计。采用流动定律方程估算冰层厚度,发现冰川静止期平均厚度范围为216~326 m,激荡期平均厚度范围为136~244 m。分析表明,基础剪切应力随着浪涌而增加,而粘度正在降低。可以说,冰川从静止阶段向涌动阶段的转变,完全改变了它的动态行为和特征。此外,在没有实地观察的情况下,地理空间技术可以提供对冰川物理和动力学参数的合理估计。可以说,冰川从静止阶段向涌动阶段的转变,完全改变了它的动态行为和特征。此外,在没有实地观察的情况下,地理空间技术可以提供对冰川物理和动力学参数的合理估计。可以说,冰川从静止阶段向涌动阶段的转变,完全改变了它的动态行为和特征。此外,在没有实地观察的情况下,地理空间技术可以提供对冰川物理和动力学参数的合理估计。

更新日期:2021-08-23
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