Millennial-scale migration of the frozen/melted basal boundary, western Greenland ice sheet

Millennial-scale migration of the frozen/melted basal boundary, western Greenland ice sheet
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格陵兰岛西部冰盖冻结/融化的基底边界的千年规模迁移

DOI:
10.1017/jog.2021.134
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发表时间:
2022
影响因子:
3.4
通讯作者:
Meierbachtol, Toby
Meierbachtol, Toby
中科院分区:
地球科学3区
文献类型:
--
作者:
Stansberry, Aidan;Harper, Joel;Johnson, Jesse V.;Meierbachtol, Toby

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格陵兰岛西部冰盖的几何形状和热结构在全新世经历了相对重大的变化。在这段时间内,与冰盖退缩有关的床的冻结和融化部分的演变尚不清楚。我们使用热-机械耦合流线模型来模拟格陵兰岛中西部11 ka时期的冰盖退缩来解决这个问题。结果表明,上游冻结/融化基底边界迁移约为16 km,而末端后退约为100 km。冻土区的大部分迁移与摩擦加热场和应变加热场的增强有关,而摩擦加热场和应变加热场向后退的冰缘方向加剧。热活动的基岩层作为一个吸热器,倾向于缓慢收缩的冻土条件。由于我们地区的基岩热通量相对于冰盖的其他地区相对较低,因此冻结地区相对较大,因此更容易受到摩擦和应变加热场的边缘变化的影响。因此,融化区域的迁移取决于基岩和冰的几何变化和先前的热状态,这两者在冰盖周围都有很大的变化。
The geometry and thermal structure of western Greenland ice sheet are known to have undergone relatively substantial change over the Holocene. Evolution of the frozen and melted fractions of the bed associated with the ice-sheet retreat over this time frame remains unclear. We address this question using a thermo-mechanically coupled flowline model to simulate a 11 ka period of ice-sheet retreat in west central Greenland. Results indicate an episode of ~100 km of terminus retreat corresponded to ~16 km of upstream frozen/melted basal boundary migration. The majority of migration of the frozen area is associated with the enhancement of the frictional and strain heating fields, which are accentuated toward the retreating ice margin. The thermally active bedrock layer acts as a heat sink, tending to slow contraction of frozen-bed conditions. Since the bedrock heat flux in our region is relatively low compared to other regions of the ice sheet, the frozen region is relatively greater and therefore more susceptible to marginward changes in the frictional and strain heating fields. Migration of melted regions thus depends on both geometric changes and the antecedent thermal state of the bedrock and ice, both of which vary considerably around the ice sheet.
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