Preprints
https://doi.org/10.5194/tc-2021-332
https://doi.org/10.5194/tc-2021-332

  03 Dec 2021

03 Dec 2021

Review status: this preprint has been withdrawn by the authors.

New large subglacial lake in Princess Elizabeth Land, East Antarctica, detected by airborne geophysical observations

Lin Li1, Aiguo Zhao2,3, Tiantian Feng2,3, Xiangbin Cui1, Lu An2,3, Ben Xu4, Shinan Lang4, Liwen Jing2,3, Tong Hao2,3, Jingxue Guo1, Bo Sun1, and Rongxing Li2,3 Lin Li et al.
  • 1Polar Research Institute of China, Shanghai, China
  • 2Center for Spatial Information Science and Sustainable Development Applications, Tongji University, Shanghai, China
  • 3College of Surveying and Geo-Informatics, Tongji University, Shanghai, China
  • 4Faculty of Information Technology, Beijing University of Technology, Beijing, China

Abstract. Knowledge of subglacial lakes is important for understanding the stability of the Antarctica Ice Sheet (AIS) and its contribution to the global sea-level change. We designed an intensified airborne campaign to collect geophysical data in Princess Elizabeth Land (PEL), East Antarctica, during the 2015–2019 CHINARE expeditions. We developed an innovative method to build a set of evidence of a newly detected subglacial lake, Lake Zhongshan. Adaptive RES data analysis allowed us to detect the lake surface and extent. We quantified the lake depth and volume via gravity modeling. Another dataset collected at Lake Vostok provided the ground truth. The results revealed that Lake Zhongshan, located at 73°26'53"S, 80°30'39"E and ~3,603 m below surface, has an area of 328 ± 1 km2, making it the only one in PEL and the fifth largest in Antarctica. These findings are important for understanding subglacial hydrodynamics in PEL, as well as the stability of the AIS.

This preprint has been withdrawn.

Lin Li et al.

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Lin Li et al.

Lin Li et al.

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Short summary
No subglacial lakes have been reported in Princess Elizabeth Land (PEL), East Antarctica. In this study, thanks to a new suite of airborne geophysical observations in PEL, including RES and gravity data collected during the Chinese National Antarctic Research Expedition, we detected a large subglacial lake of ~45 km in length, ~11 km in width, and ~250 m in depth. These findings will help us understand ice sheet stability in the PEL region.