Geodetic monitoring of crustal deformation in Dronning Maud Land, Antarctica Hannu Koivula, Jaakko...

Geodetic monitoring of crustal deformation in Dronning Maud Land, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, 24 - 29 April, 2005

Geodetic monitoring of crustal deformation in Dronning Maud Land, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual Meeting Masala , May 3-4, 2005

Schedule 2005 -

• GPS 2003 -

• 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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, AntarcticaHannu Koivula, Jaakko Mäkinen, Joel Ahola and Markku PoutanenFinnish Geodetic Institute

Nordic Geodetic CommissionWorking Group for GeodynamicsAnnual 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