Velocity Anomaly of Campbell Glacier, East Antarctica, Observed by Double-Differential Interferometric SAR and Ice Penetrating Radar

Regional changes in the flow velocity of Antarctic glaciers can affect ice sheet mass balance and formation surface crevasses. The anomaly a glacier be detected using Double-Differential Interferometric Synthetic Aperture Radar (DDInSAR) technique that removes constant displacement two Differential SAR (DInSAR) images at different times shows only temporally variable displacement. In this study, circular-shaped ice-velocity anomalies Campbell Glacier, East Antarctica, were analyzed by 13 DDInSAR generated from COSMO-SkyMED one-day tandem DInSAR 2010–2011. topography bed obtained helicopter-borne Ice Penetrating (IPR) surveys 2016–2017. Denoted as A B, circular shapes with radii ~800 m, located 14.7 km (A) 11.3 (B) upstream grounding line Glacier. Velocity up to ~1 cm/day for ~5 B. To investigate cause anomalies, profiles derived IPR survey crossing analyzed. lay over hill along glacial valley where stick-slip pressure melting occur, resulting temporal variation velocity. bright radar reflection flat hydraulic head observed IPR-derived radargram strongly suggested existence basal water form reservoir or film, which caused smaller friction reduced motion compared Crevasses began appear B due tensile stress top fast downstream. sporadic shift location suggests complex transportation hill.