Upper Mantle Viscosity Underneath Northern Marguerite Bay, Antarctic Peninsula Constrained by Bedrock Uplift and Ice Mass Variability
Upper Mantle Viscosity Underneath Northern Marguerite Bay, Antarctic Peninsula Constrained by Bedrock Uplift and Ice Mass Variability
复制标题
南极半岛北玛格丽特湾下方的上地幔粘度受基岩隆起和冰质量变化的约束
DOI：
--
复制
发表时间：
2021
影响因子：
5.2
通讯作者：
A. Bordoni
中科院分区：
文献类型：
--
作者：
N. Samrat;Matt A. King;C. Watson;Andrea Hay;V. Barletta;A. Bordoni
我们约束粘弹性地球流变学和最近的冰块在南极半岛的北方玛格丽特湾地区的变化。来自罗瑟拉和圣马丁站的全球定位系统（GPS）时间序列显示，1999-2005年和2016-2020年基岩抬升幅度为1.8 -1.8毫米/年，2005-2016年为1.5 -6.0毫米/年。数字高程模型显示，地表大幅下降，但自2009年以来下降速度较低。使用这些数据，我们表明，弹性模型不能解释非线性隆起的GPS网站，但分层粘弹性模型可以。我们发现，GPS隆起变化与粘弹性模型之间的一致性非常好，有效弹性岩石圈厚度和上地幔粘度分别为10-95 km和10.1 - 9 × 1018 Pa s。我们的粘度估计是一致的粘度北南梯度建议以前的研究集中在南极半岛内的特定地区，并增加了进一步的证据表明，低粘度上地幔在南极半岛北方。
We constrain viscoelastic Earth rheology and recent ice‐mass change in the northern Marguerite Bay region of the Antarctic Peninsula. Global Positioning System (GPS) time series from Rothera and San Martin stations show bedrock uplift range of ∼−0.8–1.8 mm/year over 1999–2005 and 2016–2020 but ∼3.5–6.0 mm/year over ∼2005–2016. Digital elevation models reveal substantial surface lowering, but at a lower rate since ∼2009. Using these data, we show that an elastic‐only model cannot explain the non‐linear uplift of the GPS sites but that a layered viscoelastic model can. We show close agreement between GPS uplift changes and viscoelastic models with effective elastic lithosphere thickness and upper‐mantle viscosity ∼10–95 km and ∼0.1−9 × 1018 Pa s, respectively. Our viscosity estimate is consistent with a north‐south gradient in viscosity suggested by previous studies focused on specific regions within the Antarctic Peninsula and adds further evidence of the low viscosity upper mantle in the northern Antarctic Peninsula.
影响因子：
5.3
作者：
Nield, Grace A.;Barletta, Valentina R.;Berthier, Etienne
通讯作者：
Berthier, Etienne
影响因子：
2.8
作者：
N. Samrat;Matt A. King;C. Watson;A. Hooper;Xianyao Chen;V. Barletta;A. Bordoni
通讯作者：
N. Samrat;Matt A. King;C. Watson;A. Hooper;Xianyao Chen;V. Barletta;A. Bordoni