Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry

Mapping Basal Melt Under the Shackleton Ice Shelf, East Antarctica, From CryoSat-2 Radar Altimetry
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利用 CryoSat-2 雷达测高仪绘制南极洲东部沙克尔顿冰架下的基底融化图

DOI:
10.1109/jstars.2021.3077359
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发表时间:
2021
影响因子:
5.5
通讯作者:
Lei Zheng
Lei Zheng
中科院分区:
工程技术3区
文献类型:
--
作者:
Qi Liang;Chunxia Zhou;Lei Zheng

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冰架支撑着快速流动的冰川排干冰盖,因此冰架的变化可能会改变支撑作用和地面冰的排放,从而影响海平面。冰架的基本融化将降低它们抑制地面冰向海洋排放的能力。然而,由于计算中存在很大的不确定性,估计基本熔体速率具有挑战性。在这项研究中,我们使用拉格朗日框架来改进基本融化速率的推导,并将该方法应用于沙克尔顿冰架作为案例研究。我们利用CryoSat-2数据研究了2010-2018年间冰架表面高程变化的空间分布模式。将这些结果与区域气候模式的冰面速度和输出相结合,我们得到了基本融化速率图,并计算了总的和平均的基本物质平衡。沙克尔顿冰架的基本融水总产量为54.6±7.2GT/年。最高的融化速率超过50m/年,靠近接地线和Denman冰川的主干。分析表明,拉格朗日方法可以提供更多的冰架表面高程变化的空间相关模式,减少了基本融化速率计算的不确定性。
Ice shelvesbuttress the fast-flowing glaciers draining ice sheets, so changes in the ice shelves may alter the buttressing effect and the discharge of grounded ice, therefore influencing sea level. Basal melting of the ice shelves would reduce their ability to restrain the discharge of grounded ice into the ocean. However, estimating the basal melt rate is challenging due to the large uncertainty in the calculation. In this study, we use a Lagrangian framework to improve the basal melt rate derivation and apply the method to the Shackleton ice shelf as a case study. We use the CryoSat-2 data to characterize the spatial distribution patterns of ice shelf surface elevation changes between 2010 and 2018. Combining these results with the ice surface velocity and output from the regional climate model, we obtain a map of the basal melt rate and calculate the total and average basal mass balance. The total basal meltwater production for the Shackleton ice shelf is 54.6 ± 7.2 Gt/yr. The highest melt rates, which exceed 50 m/yr, are found close to the grounding line and the main trunk of Denman glacier. Based on the analysis, we show that the Lagrangian method can provide more spatially coherent patterns of ice shelf surface elevation changes and reduce the uncertainty in basal melt rate calculation.
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