Till Provenance for Whillans Ice Stream, West Antarctica: from Upstream B, Subglacial Lake Whillans, and the Grounding Zone

Rebecca Puttkammer1, Ross D Powell2, Timothy O Hodson3, Franco M Talarico4, Slawek M Tulaczyk5, Reed P Scherer1, Jason James James Coenen6 and WISSARD Science Team, (1)Northern Illinois University, DeKalb, IL, United States, (2)Northern Illinois Univ., Geology and Environmental Geosciences, De Kalb, IL, United States, (3)Illinois State Water Survey, Champaign, United States, (4)University of Siena, Department of Physical Sciences, Earth and Environment, Siena, Italy, (5)University of California Santa Cruz, Earth and Planetary Sciences, Santa Cruz, CA, United States, (6)Northern Illinois University, DeKalb, United States