Brief Communication: Heterogenous thinning and subglacial lake activity on Thwaites Glacier, West Antarctica

• Main Authors: Hoffman, Andrew O., Christianson, Knut, Shapero, Daniel, Smith, Benjamin E., Joughin, Ian
• Format: Text
• Language: English
• Published: 2020
• Subjects: Austral; New Lake; Thwaites Glacier; West Antarctica; Antarc*; Antarctica
• Online Access: https://doi.org/10.5194/tc-2020-80; https://tc.copernicus.org/preprints/tc-2020-80/

A system of subglacial lakes drained on Thwaites Glacier from 2012–2014. To improve coverage for subsequent drainage events, we extended the elevation and ice velocity time series on Thwaites Glacier through austral winter 2019. These new observations document a second drainage cycle and identified two new lake systems located in the western tributaries of Thwaites and Haynes Glaciers. In situ and satellite velocity observations show temporary < 3 % speed fluctuations associated with lake drainages. In agreement with previous studies, these observations suggest that active subglacial hydrology has little influence on Thwaites Glacier thinning and retreat on decadal to centennial timescales