DInSAR signal of a subglacial lake in Wilkes Land, East Antarctica

In previous study, we have observed a circular velocity anomaly of David Glacier, East Antarctica, by using Double-Differential Interferometric Synthetic Aperture Radar (DDInSAR) technique. Ascending and descending LOS vectors and displacements were used to obtain 3-D components of this circular shaped anomaly. As a result, we found that vertical motion prevailed over horizontal motion, which implies water level change of subglacial lake. In this study, we focus on the subglacial lakes found in the previous study (Smith et al., 2009) and observed a circular anomaly in the interferograms. DInSAR and DDInSAR were performed using Sentinel-1 data at 12-day intervals over the East Antarctica. A possible subglacial lake area of Wilkes Land was detected by a circular velocity anomaly in time-series DInSAR, indicating that the elevation change of the glacier surface is continuously changing. It is found that DInSAR and DDInSAR analysis is useful to find the location of subglacial lakes and to select a site for field exploration.