Link to Web Site Portal Home
Record Search Query: [Freetext='DIF/IDN_Node: AMD/NZ']
Ground Penetrating Radar (GPR) surveys of a an ice rise on the southern McMurdo Ice Shelf, Antarctica.
Entry ID: K065_2004_2005_NZ


[ Update this Record ]

Summary
Abstract: A topographic rise was observed on satellite imagery and ground traverses of the southern McMurdo Ice Shelf, part way between the SW tip of Black Island and the north shore of Minna Bluff was investigated in January 2005 using Ground Penetrating Radar (GPR) and GPS. Nine 50 MHz GPR profiles ranging from 1.5 to 2.5 km in length, were collected using a snowmobile-towed Sensors & Software Pulse Ekko 100 radar system. The GPR transects were configured in an obliquely crossing network, with accompanying topographic information provided by continuous kinematic GPS. Reflectors identified on the GPR profiles indicate that the ice shelf in this locality is grounded on an asymmetric crater-shaped bathymetric feature. Following conversion of two-way-travel-times (TWTT) to depth, it appears that the crater rims are ~50 m below the ice shelf surface while the crater floor is undulating at ~100 m depth. The presence of this pinning point and its morphology has implications for local ice shelf flow characteristics and for understanding the dynamics of the McMurdo Ice Shelf as a whole. Eight out of 44 ice movement poles established in the 02/03 and 03/04 season were resurveyed using differential GPS. This study builds on studies investigating the characteristics and processes of the southern McMurdo Ice Shelf.

Related URL
Link: VIEW RELATED INFORMATION


Geographic Coverage
 N: -78.3572 S: -78.3828  E: 166.2547  W: 166.0042
 Min Altitude: -35M  Max Altitude: -18.5M  Min Depth: 0M (ICE SHELF SURFACE)  Max Depth: 130M (BELOW ICE SHELF SURFACE)

Temporal Coverage
Start Date: 2005-01-27
Stop Date: 2005-01-29


Location Keywords
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR
OCEAN > SOUTHERN OCEAN > ROSS SEA


Science Keywords
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY    [Definition]
OCEANS >BATHYMETRY/SEAFLOOR TOPOGRAPHY >BATHYMETRY    [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER THICKNESS/ICE SHEET THICKNESS    [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER TOPOGRAPHY/ICE SHEET TOPOGRAPHY    [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIER MOTION/ICE SHEET MOTION    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION
LOCATION


Platform
FIELD SURVEYS    [Information]


Instrument
GPS >Global Positioning System    [Information]
GPR >Ground Penetrating Radar    [Information]


Quality
The data is contained within the thesis and publication. Please contact the investigator for more information.


Data Set Progress
COMPLETE


Data Center
Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand    [Information]
Data Center URL: http://www.antarcticanz.govt.nz/

Data Center Personnel
Name: SHULAMIT GORDON
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


Personnel
GARY S. WILSON
Role: INVESTIGATOR
Phone: +64 3 479 7509
Fax: +64 3 479 7527
Email: gary.wilson at stonebow.otago.ac.nz
Contact Address:
Department of Geology
University of Otago
PO Box 56
City: Dunedin
Country: New Zealand


CEISHA POIROT
Role: DIF AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: c.poirot at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


SHULAMIT GORDON
Role: DIF AUTHOR
Phone: +64 3 358 0200
Fax: +64 3 358 0211
Email: s.gordon at antarcticanz.govt.nz
Contact Address:
Antarctica New Zealand
Private Bag 4745
City: Christchurch
Country: New Zealand


Publications/References
Andrew, A.E. 2005. Physiography, flow characteristics and vulnerablity of the Southern McMurdo Ice shelf, Antarctica. MSc Thesis, University of Otago, New Zealand

Horgan, H. Bannister, S. Naish, T. Wilson, G. Pyne, A. Clifford, A. Finnemore, M. ANDRILL site investigations/seismic surveys, McMurdo Ice Shelf, McMurdo Sound, Antarctica. Lower Hutt, New Zealand: Institute of Geological and Nuclear Sciences. 2003.[Institute of Geological and Nuclear Sciences science report 2003/05]

Creation and Review Dates
DIF Creation Date: 2005-11-01
Last DIF Revision Date: 2009-03-27


  Reformat as FGDC document



[ Update this Record ]