A newly discovered subglacial lake in East Antarctica likely hosts a valuable sedimentary record of ice and climate change
A newly discovered subglacial lake in East Antarctica likely hosts a valuable sedimentary record of ice and climate change
复制标题
东南极洲新发现的冰下湖可能蕴藏着有关冰和气候变化的宝贵沉积记录
作者：
Shuai Yan;Donald D. Blankenship;Jamin S. Greenbaum;Duncan A. Young;Lin Li;Anja Rutishauser;Jingxue Guo;Jason L. Roberts;Tas D. van Ommen;Martin J. Siegert;Bo Sun
东南极冰盖的伊丽莎白公主地部分是一个重要的地面冰水库，毗邻在第四纪冰川周期和上新世温暖时期经历巨大变化的地区。伊丽莎白公主地存在广泛的冰下水系统（迄今为止仅从卫星图像推断），有可能对上覆冰盖的热和运动学条件产生重大影响。我们确认存在一个主要的冰下湖，这里被称为雪鹰湖（LSE），首次使用最近获得的航空地球物理数据。通过二维地球物理反演模型，系统地研究了大东海的地质特征和水深。反演结果表明，LSE位于沿着挤压地质边界上，这为今后描述该地区的地质构造背景提供了参考。我们估计LSE长约42公里，面积370平方公里，使其成为南极洲最大的冰下湖泊之一。此外，机载冰穿透雷达观测和地球物理反演揭示了一层松散的水饱和沉积物周围和底部的LSE，这-考虑到超低的沉积速率预期在这样的环境可能存档有价值的记录古环境变化和早期历史的东南极冰盖演变伊丽莎白公主地。
The Princess Elizabeth Land sector of the East Antarctic Ice Sheet is a significant reservoir of grounded ice and is adjacent to regions that experienced great change during Quaternary glacial cycles and Pliocene warm episodes. The existence of an extensive subglacial water system in Princess Elizabeth Land (to date only inferred from satellite imagery) bears the potential to significantly impact the thermal and kinematic conditions of the overlying ice sheet. We confirm the existence of a major subglacial lake, herein referred to as Lake Snow Eagle (LSE), for the first time using recently acquired aerogeophysical data. We systematically investigated LSE’s geological characteristics and bathymetry from two-dimensional geophysical inversion models. The inversion results suggest that LSE is located along a compressional geologic boundary, which provides reference for future characterization of the geologic and tectonic context of this region. We estimate LSE to be ~42 km in length and 370 km2 in area, making it one of the largest subglacial lakes in Antarctica. Additionally, the airborne ice-penetrating radar observations and geophysical inversions reveal a layer of unconsolidated water-saturated sediment around and at the bottom of LSE, which—given the ultralow rates of sedimentation expected in such environments—may archive valuable records of paleoenvironmental changes and the early history of East Antarctic Ice Sheet evolution in Princess Elizabeth Land.
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影响因子：
11.4
作者：
X. Cui;H. Jeofry;J. Greenbaum;Jingxue Guo;Lin Li;L. Lindzey;F. Habbal;Wei Wei-Wei;D. Young;N. Ross;M. Morlighem;Lenneke M. Jong;J. Roberts;D. Blankenship;S. Bo;M. Siegert
通讯作者：
X. Cui;H. Jeofry;J. Greenbaum;Jingxue Guo;Lin Li;L. Lindzey;F. Habbal;Wei Wei-Wei;D. Young;N. Ross;M. Morlighem;Lenneke M. Jong;J. Roberts;D. Blankenship;S. Bo;M. Siegert
影响因子：
6.1
作者：
Devsamridhi Arora;N. Pant;M. Pandey;A. Chattopadhyay;J. Greenbaum;M. Siegert;S. Bo;D. Blankenship;N. V. C. Rao;A. Bhandari
通讯作者：
Devsamridhi Arora;N. Pant;M. Pandey;A. Chattopadhyay;J. Greenbaum;M. Siegert;S. Bo;D. Blankenship;N. V. C. Rao;A. Bhandari
影响因子：
4.9
作者：
M. Searle;Jon Cox
通讯作者：
M. Searle;Jon Cox
DOI：
10.1190/1.9781560802433
发表时间：
1971
期刊：
--
影响因子：
--
作者：
L. L. Nettleton-L.
通讯作者：
L. L. Nettleton-L.
影响因子：
64.8
作者：
Ferraccioli, Fausto;Finn, Carol A.;Damaske, Detlef
通讯作者：
Damaske, Detlef