Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 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, April, 2005

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 Study Program 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 Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 Study area Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 GPS Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 Absolute gravity Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 Absolute gravity Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 Near-field snow and ice Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 Results Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 Schedule GPS Absolute gravity –Aboa 1994, 2001, 2004, 2006, 2008 –Sanae IV, Novolazarevskaya 2004, 2006, 2008 –Svea, Troll ?? Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 Summary & conclusion 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 Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners

Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku Poutanen Finnish Geodetic Institute Nordic Geodetic Commission Working Group for Geodynamics Annual Meeting Masala, May 3-4, 2005 absolute gravity, CGPS, Cryosat, and GRACE all sense past and/or present changes in the ice mass. 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). Summary & conclusion Using them in combination provides powerful redundancy checks and the possibility to estimate/eliminate unwanted signals and modelling errors. Study program Study Area GPS Absolute gravity Near-field snow and ice Results Schedule 2005 – Summary & conclusion Partners