Modelling the fate of surface melt on the Larsen C Ice Shelf
Modelling the fate of surface melt on the Larsen C Ice Shelf
复制标题
DOI：
10.5194/tc-12-3565-2018
复制
发表时间：
2018-11-19
期刊：
影响因子：
5.2
通讯作者：
Flocco, Daniela
中科院分区：
文献类型：
--
作者：
Buzzard, Sammie;Feltham, Daniel;Flocco, Daniela
表面融化的湖泊降低了冰架的覆盖度，导致额外的表面融化。这可以大大改变冰架的表面能量平衡和内部温度和密度分布。研究表明，在2002年拉森B冰架的突然崩溃中，融化湖也扮演了重要角色。本文将一个新近发展的、高物理保真度的融化湖发展周期模式应用于南极洲最北方的拉森C冰架，并在那里观测到了融化湖。我们模拟目前的条件下，使用气象站和再分析数据的冰架和研究潜在的未来增加的降水和空气温度对融化湖形成的影响，同时增加导致增加湖depth.Finally，我们评估的可行性，在未来的决口传播通过冰架由于表面融水积累。
Surface melt lakes lower the albedo of ice shelves, leading to additional surface melting. This can substantially alter the surface energy balance and internal temperature and density profiles of the ice shelf. Evidence suggests that melt lakes also played a pivotal role in the sudden collapse of the Larsen B Ice Shelf in 2002.Here a recently developed, high-physical-fidelity model accounting for the development cycle of melt lakes is applied to the Larsen C Ice Shelf, Antarctica's most northern ice shelf and one where melt lakes have been observed. We simulate current conditions on the ice shelf using weather station and reanalysis data and investigate the impacts of potential future increases in precipitation and air temperature on melt lake formation, for which concurrent increases lead to an increase in lake depth.Finally, we assess the viability in future crevasse propagation through the ice shelf due to surface meltwater accumulation.