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Sediments, Water, and Inland Ice Flow: A Geologic Control on Ice Stream Tributaries?

Sediments, Water, and Inland Ice Flow: A Geologic Control on Ice Stream Tributaries?. Leo E. Peters Sridhar Anandakrishnan, Richard B. Alley, J. Paul Winberry, Donald E. Voigt, Andrew M. Smith, Donald D. Blankenship, David L. Morse WAIS Conference Friday, September 30, 2005.

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Sediments, Water, and Inland Ice Flow: A Geologic Control on Ice Stream Tributaries?

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  1. Sediments, Water, and Inland Ice Flow: A Geologic Control on Ice Stream Tributaries? Leo E. Peters Sridhar Anandakrishnan, Richard B. Alley, J. Paul Winberry, Donald E. Voigt, Andrew M. Smith, Donald D. Blankenship, David L. Morse WAIS Conference Friday, September 30, 2005

  2. Outline • Importance of Subglacial Sediments • Previous Work along the Siple Coast • Along the Ice Streams • Onset of Kamb and Bindschadler • Seismic Reflection and Results • Interpretation/Conclusions

  3. Subglacial Sediments and Streaming Ice Flow Paleoshoreline ? ? ? Sediments

  4. Siple Coast “Ground-Truthing” C1B Whillans DT/DL CT Kamb Seismic Reflection/Refraction Seismic Reflection - Shown Bindschadler

  5. C1B Whillans Kamb Bindschadler

  6. Sediments Above and Below the Onset Direction of Ice Flow Peters et al. (accepted by JGR-Solid Earth)

  7. The C1B Reflection Seismic Profile Direction of Ice Flow

  8. The C1B Reflection Seismic Profile Direction of Ice Flow Direction of Ice Flow Base of Ice Sedimentary Structure Base of Sediments Basement

  9. Whillans DT/DL Kamb Bindschadler

  10. Sediments Above the Onset Peters et al. (accepted by JGR-Solid Earth)

  11. The DL Reflection Seismic Profile Direction of Ice Flow Depth Below Surface (meters) Depth Below Surface (meters)

  12. Reflectivity of the Bed

  13. The DL Reflection Seismic Profile Direction of Ice Flow Depth Below Surface (meters) Depth Below Surface (meters) No Amplitude Phase Change = Till

  14. The DL Reflection Seismic Profile Direction of Ice Flow Depth Below Surface (meters) Depth Below Surface (meters) Amplitude Phase Change = Dilatant Till

  15. The DL Reflection Seismic Profile Direction of Ice Flow Blue = Dilatant Till Red = Till Depth Below Surface (meters) Depth Below Surface (meters)

  16. Whillans CT Kamb Bindschadler

  17. The CT Reflection Seismic Profile

  18. The CT Reflection Seismic Profile Blue = Dilatant Till to Water Red = Till

  19. Siple Coast Ice Dynamics ? ? ? ? Pine Island Glacier: faster flow… Different geologic conditions??? Variability across the Siple Coast

  20. A Special Thanks to the 2002 – 2003 OND Field Crew And…

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