Remote GPS in Antarctica

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Presentation transcript:

Remote GPS in Antarctica Andrea Donnellan and Bruce Luyendyk Thanks to: Mark Smith, Tom Rebold, Henry Awaya, Demetri Capetanopoulos, Russell Knight, Shannon Jackson, Alan Hogan, Charles Day, and Timothy Stough. Kenneth Hurst for data processing and Donald Argus for the plate rotation. Eric Ivins for discussions of postglacial rebound modeling. Supported by US NSF OPP 9725876 and NASA.

Location maps

Post Glacial Rebound The thick ice sheet pushes down on the earth As the ice thins the mantle flows back The surface of the earth rebounds

Ford Ranges from the air

At Siple Dome…

Installing MBL1 Rockefeller Mountains

MBL1, Mt. Patterson, Rockefeller Mts., Marie Byrd Land Antenna is still in place…

Length time series; wrt Davis, McMurdo MBL3 data not used for 2002

Absolute Horizontal Velocities

Residual Horizontal Velocities Plate rotation about Davis removed

Vertical time series MBL3 data not used for 2002

Vertical Velocities

Conclusions so far… No horizontal strain >2 mm/yr in wMBL, across Ross Embayment, or between WANT and EANT Vertical motion due to rebound since late Holocene retreat - load was in east Ross Sea Continuous power source is key to continuous GPS Steve Tucker