A newly discovered subglacial lake in East Antarctica likely hosts a valuable sedimentary record of ice and climate change

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

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

6 Citationer (Scopus)

Resumé

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.

OriginalsprogEngelsk
Sider (fra-til)949-953
Antal sider5
TidsskriftGeology
Vol/bind50
Udgave nummer8
DOI
StatusUdgivet - 1 aug. 2022

Programområde

  • Programområde 5: Natur og klima

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