Ice melting impact on crustal deformation observed by space geodesy in Svalbard

• Main Authors: Tafflet, Alicia, Nicolas, Joëlle, Boy, Jean-Paul, Lemoine, Jean-Michel, Perosanz, Félix, Durand, Frédéric, Koulali, Achraf, Gourillon, Lissa, Pillet, Valentin, Baltzer, Agnès, Verdun, Jérôme
• Other Authors: Laboratoire Géomatique et foncier (GeF), Conservatoire National des Arts et Métiers CNAM (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Institut Terre Environnement Strasbourg (ITES), École Nationale du Génie de l'Eau et de l'Environnement de Strasbourg (ENGEES)-Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales Toulouse (CNES), School of Engineering Newcastle, Newcastle University Newcastle, Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG), Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (Nantes Univ - IGARUN), Nantes Université - pôle Humanités, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Humanités, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), i-Sea, Littoral, Environnement, Télédétection, Géomatique (LETG - Nantes ), Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Nantes Université (Nantes Univ)-Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG), Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (Nantes Univ - IGARUN), Nantes Université (Nantes Univ)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2023
• Subjects: [SDE]Environmental Sciences; Norway; Svalbard; Svalbard Archipelago
• Online Access: https://hal.science/hal-04306351

International audience Environmental mass redistribution, including the recent and past ice melting, induces Earth’s surface deformations as well as time variations in its gravity field. These effects are known as loading effects and can be accurately monitored using space geodesy techniques. In this study, we analyse more than 20 years of GNSS (Global Navigation Satellite System) satellite 3D positioning solutions at 17 permanent sites over the Svalbard archipelago. The results are compared with deformations computed from time gravity field variations observed by the space gravimetry missions GRACE (Gravity Recovery and Climate Experiment) and GRACE-Follow On. The combination of these two techniques takes advantage of their complementary temporal and spatial resolutions, helping to distinguish between local, regional, and global signals. Our results indicate that the mean vertical motion is of about 9 mm/year upward and can reach 15 mm/yr in some places. We show that most of the loading signal is due to local effects. We then compare these GNSS and GRACE datasets with Little Ice Age (LIA) and Global Isostatic Adjustment (GIA) models as well as with satellite altimetry observations from CryoSat 2 and IceSat¬¬ 2. These comparisons allow us to separate the various contributions and to estimate the impact of the current climate change on Svalbard. The results are then discussed in relation to in situ observations.