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Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica. Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute, Masala, Finland. Poster: European Geosciences Union, General Assembly 2005, Vienna, Austria, 24 - 29 April, 2005.

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Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica

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  1. Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute, Masala, Finland Poster: European Geosciences Union, General Assembly 2005, Vienna, Austria, 24 - 29 April, 2005

  2. Study Program Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners Crustal deformation in DML • Permanent GPS station(s) • Vertical and horizontal motion • Repeated absolute gravity • Vertical motion • changes in dencity distribution • Grace • regional estimates of variation in total mass • CryoSat • Surface elevation change

  3. Study area Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

  4. GPS Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

  5. Absolute gravity Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

  6. Absolute gravity Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

  7. Near-field snow and ice Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

  8. Results Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

  9. Schedule 2005 - Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners • GPS 2003 - • Absolute gravity • Aboa • 1994, 2001, 2004, 2006, 2008 • Sanae IV, Novolazarevskaya • 2004, 2006, 2008 • Svea, Troll ??

  10. Summary & conclusion Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners • GRACE will provide regional estimates of variation in total mass i.e. the sum of mantle flow of the Glacial Isostatic Adjustment and contemporary ice mass balance. • In the near future, CRYOSAT will monitor surface elevation change. • FGI continues gravity & GPS program

  11. Summary & conclusion • absolute gravity, CGPS, Cryosat, and GRACE all sense past and/or present changes in the ice mass. Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners • They however have shortcomings and observational errors, and are also sensitive to other signals: say, tectonics (gravity, GPS) or variation in atmospheric and ocean mass (GRACE). • Using them in combination provides powerful redundancy checks and the possibility to estimate/eliminate unwanted signals and modelling errors.

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