An Attempt to Observe Vertical Land Motion along the Norwegian Coast by CryoSat-2 and Tide Gauges

• Published in: Remote Sensing
• Main Authors: Martina Idžanović, Christian Gerlach, Kristian Breili, Ole Baltazar Andersen
• Format: Article in Journal/Newspaper
• Language: English
• Published: MDPI AG 2019
• Subjects: CryoSat-2; tide gauges; Norwegian coast; vertical land motion; land-uplift model; Science; Q; Fennoscandia
• Online Access: https://doi.org/10.3390/rs11070744; https://doaj.org/article/d52d6516bada41228d613ad664d588ae

Present-day climate-change-related ice-melting induces elastic glacial isostatic adjustment (GIA) effects, while paleo-GIA effects describe the ongoing viscous response to the melting of late-Pleistocene ice sheets. The unloading initiated an uplift of the crust close to the centers of former ice sheets. Today, vertical land motion (VLM) rates in Fennoscandia reach values up to around 10 mm/year and are dominated by GIA. Uplift signals from GIA can be computed by solving the sea-level equation (SLE), <math display="inline"> <semantics> <mover accent="true"> <mi>S</mi> <mo>˙</mo> </mover> </semantics> </math> = <math display="inline"> <semantics> <mover accent="true"> <mi>N</mi> <mo>˙</mo> </mover> </semantics> </math> − <math display="inline"> <semantics> <mover accent="true"> <mi>U</mi> <mo>˙</mo> </mover> </semantics> </math> . All three quantities can also be determined from geodetic observations: relative sea-level variations ( <math display="inline"> <semantics> <mover accent="true"> <mi>S</mi> <mo>˙</mo> </mover> </semantics> </math> ) are observed by means of tide gauges, while rates of absolute sea-level change ( <math display="inline"> <semantics> <mover accent="true"> <mi>N</mi> <mo>˙</mo> </mover> </semantics> </math> ) can be observed by satellite altimetry; rates of VLM ( <math display="inline"> <semantics> <mover accent="true"> <mi>U</mi> <mo>˙</mo> </mover> </semantics> </math> ) can be determined by GPS (Global Positioning System). Based on the SLE, <math display="inline"> <semantics> <mover accent="true"> <mi>U</mi> <mo>˙</mo> </mover> </semantics> </math> can be derived by combining ...