[M-IS20] Global climate change driven by the Southern Ocean and the Antarctic Ice Sheet

[MIS20-P05] Detection of the grounding line of Langhobde and Shirase glaciers in East Antarctica

*Chiyuki Narama¹, Tsutomu Yamanokuchi², Shin Sugiyama³ (1.Niigata University, Program of Field Research in the Environmental Sciences, 2.RESTEC, 3.Hokkaido University, Institute of Low Temperature Science)

Keywords:grounding line, DDInSAR, ice shelf, tidal fluctuations

The USAP and SCAR data show grounding line data in the East Antarctica based on optical images and Interferometric SAR (InSAR) data of ERS-1/2 data taken around 1995-1996 (Konrad et al., 2018). However, the accuracy of the positions is not perfect, because the grounding line may change on the tidal condition. In this study, we tried to detect a vertical fluctuation area of ice shelf in response to tidal fluctuations in the Langhovde and Shirase glaciers in East Antarctica based on satellite data. We used Double Differential InSAR (DDInSAR; Doi et al., 2011), analysis method in this study. This method can extract phase difference caused by tidal movement for detecting a grounding line by removal of the phases caused by the glacier flow and topography. We tried to detect the grounding line of the Langhobde and Shirase glaciers in East Antarctica based on ALOS-2/PALSAR-2 and COSMO-SkyMed satellite data.