Sediments, Water, and Inland Ice Flow: A Geologic Control on Ice Stream Tributaries? Leo E. Peters...
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and Inland Ice Flow: and Inland Ice Flow: A Geologic Control A Geologic Control on Ice Stream on Ice Stream Tributaries? Tributaries? Leo E. Peters Leo E. Peters Sridhar Anandakrishnan, Richard B. Alley, J. Sridhar Anandakrishnan, Richard B. Alley, J. Paul Winberry, Donald E. Voigt, Andrew M. Paul Winberry, Donald E. Voigt, Andrew M. Smith, Donald D. Blankenship, Smith, Donald D. Blankenship, David L. Morse David L. Morse WAIS Conference WAIS Conference Friday, September 30, 2005 Friday, September 30, 2005
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Transcript of Sediments, Water, and Inland Ice Flow: A Geologic Control on Ice Stream Tributaries? Leo E. Peters...
Sediments, Water, and Sediments, Water, and Inland Ice Flow: A Inland Ice Flow: A
Geologic Control on Ice Geologic Control on Ice Stream Tributaries?Stream Tributaries?
Leo E. PetersLeo E. Peters
Sridhar Anandakrishnan, Richard B. Alley, J. Paul Sridhar Anandakrishnan, Richard B. Alley, J. Paul Winberry, Donald E. Voigt, Andrew M. Smith, Winberry, Donald E. Voigt, Andrew M. Smith,
Donald D. Blankenship, David L. MorseDonald D. Blankenship, David L. Morse
WAIS ConferenceWAIS Conference
Friday, September 30, 2005Friday, September 30, 2005
OutlineOutline Importance of Subglacial SedimentsImportance of Subglacial Sediments
Previous Work along the Siple CoastPrevious Work along the Siple Coast Along the Ice StreamsAlong the Ice Streams Onset of Kamb and BindschadlerOnset of Kamb and Bindschadler
Seismic Reflection and ResultsSeismic Reflection and Results
Interpretation/ConclusionsInterpretation/Conclusions
Subglacial Sediments and Subglacial Sediments and Streaming Ice FlowStreaming Ice Flow
SedimentsSediments? ? ?? ? ?
PaleoshorelinePaleoshoreline
Siple Coast “Ground-Truthing”
Seismic Reflection/RefractionSeismic Reflection/RefractionSeismic Reflection - ShownSeismic Reflection - Shown
C1BC1B
DTDT/DL/DL
CTCT
BindschadlerBindschadler
KambKamb
WhillansWhillans
C1BC1B
BindschadlerBindschadler
KambKamb
WhillansWhillans
Peters et al. (accepted by JGR-Solid Earth)Peters et al. (accepted by JGR-Solid Earth)
Sediments Above and Below Sediments Above and Below the Onsetthe Onset
Direction of Ice FlowDirection of Ice Flow
The C1B Reflection Seismic ProfileThe C1B Reflection Seismic Profile
Direction of Ice FlowDirection of Ice Flow
The C1B Reflection Seismic ProfileThe C1B Reflection Seismic Profile
Direction of Ice FlowDirection of Ice FlowDirection of Ice FlowDirection of Ice Flow
Base of IceBase of IceSedimentary StructureSedimentary StructureBase of SedimentsBase of SedimentsBasementBasement
DTDT/DL/DL
BindschadlerBindschadler
KambKamb
WhillansWhillans
Peters et al. (accepted by JGR-Solid Earth)Peters et al. (accepted by JGR-Solid Earth)
Sediments Above the OnsetSediments Above the Onset
The DL Reflection Seismic ProfileThe DL Reflection Seismic Profile
Direction of Ice FlowDirection of Ice Flow
De
pth
Belo
w S
urfa
ce (m
ete
rs)
De
pth
Belo
w S
urfa
ce (m
ete
rs)
Reflectivity of the BedReflectivity of the Bed
Direction of Ice FlowDirection of Ice Flow
De
pth
Belo
w S
urfa
ce (m
ete
rs)
De
pth
Belo
w S
urfa
ce (m
ete
rs)
The DL Reflection Seismic ProfileThe DL Reflection Seismic Profile
No Amplitude Phase Change =No Amplitude Phase Change =TillTill
Direction of Ice FlowDirection of Ice Flow
De
pth
Belo
w S
urfa
ce (m
ete
rs)
De
pth
Belo
w S
urfa
ce (m
ete
rs)
The DL Reflection Seismic ProfileThe DL Reflection Seismic Profile
Amplitude Phase Change =Amplitude Phase Change =Dilatant TillDilatant Till
Blue = Dilatant TillBlue = Dilatant Till
Red = TillRed = Till
Direction of Ice FlowDirection of Ice Flow
De
pth
Belo
w S
urfa
ce (m
ete
rs)
De
pth
Belo
w S
urfa
ce (m
ete
rs)
The DL Reflection Seismic ProfileThe DL Reflection Seismic Profile
CTCT
BindschadlerBindschadler
KambKamb
WhillansWhillans
The CT Reflection Seismic ProfileThe CT Reflection Seismic Profile
The CT Reflection Seismic ProfileThe CT Reflection Seismic Profile
Blue = Dilatant Till to WaterBlue = Dilatant Till to Water
Red = TillRed = Till
Siple Coast Ice DynamicsSiple Coast Ice Dynamics
??
??????
Variability across the Siple CoastVariability across the Siple CoastPine Island Glacier: faster flow…Pine Island Glacier: faster flow…Different geologic conditions???Different geologic conditions???
A Special Thanks to the 2002 – A Special Thanks to the 2002 – 2003 OND Field Crew2003 OND Field Crew
And…And…
