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3. Brief communication: Heterogenous thinning and subglacial lake activity on Thwaites Glacier, West Antarctica

   https://doi.org/10.5194/tc-14-4603-2020  

   Hoffman, Andrew O. ; Christianson, Knut ; Shapero, Daniel ; Smith, Benjamin E. ; Joughin, Ian ( January 2020 , The Cryosphere)

   null (Ed.)

   Abstract. A system of subglacial lakes drained on Thwaites Glacier from 2012–2014. To improve coverage for subsequent drainage events, we extended theelevation and ice-velocity time series on Thwaites Glacier through austral winter 2019. These new observations document a second drainage cycle in2017/18 and identified two new lake systems located in the western tributaries of Thwaites and Haynes glaciers. In situ and satellite velocityobservations show temporary < 3 % speed fluctuations associated with lake drainages. In agreement with previous studies, these observationssuggest that active subglacial hydrology has little influence on thinning and retreat of Thwaites Glacier on decadal to centennial timescales. 

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   https://doi.org/10.1017/aog.2020.27  

   Goldberg, Madison L. ; Schroeder, Dustin M. ; Castelletti, Davide ; Mantelli, Elisa ; Ross, Neil ; Siegert, Martin J. ( April 2020 , Annals of Glaciology)

   null (Ed.)

   Abstract Basal units – visibly distinct englacial structures near the ice-bed interface – warrant investigation for a number of reasons. Many are of unknown composition and origin, characteristics that could provide substantial insight into subglacial processes and ice-sheet history. Their significance, moreover, is not limited to near-bed depths; these units appear to dramatically influence the flow of surrounding ice. In order to enable improved characterization of these features, we develop and apply an algorithm that allows for the automatic detection of basal units. We use a tunable layer-optimized SAR processor to distinguish these structures from the bed, isochronous englacial layers and the ice-sheet surface, presenting a conceptual framework for the use of radio-echo character in the identification of ice-sheet features. We also outline a method by which our processor could be used to place observational constraints on basal units’ configuration, composition and provenance. 

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