Session: Invited talks
Author: Yusuke Suganuma / email@example.com / National Institute of Polar Research
Co-author: Jun’ichi Okuno, National Institute of Polar Research;
Reconstructing past variability of the Antarctic ice sheets is essential to understand their stability and to anticipate their contribution to future sea level rise. Recent studies have reported a significant decrease in thickness of the East Antarctic Ice Sheet (EAIS) during the last several million years. However, the geographical extent of this decrease and subsequent isostatic rebound remain uncertain. Recently, we reconstructed magnitude and timing of ice sheet retreat at the eastern Dronning Maud Land (DML), East Antarctica, based on geomorphological evidence and glacial isostatic adjustment modeling (GIA) (Suganuma et al., 2014). The data indicate that ice sheet thinning was estimated to be at least 500 m during the last 3 Ma. Although this study was the first attempt to estimate the absolute thickness of the EAIS thinning, local effects, such as regional ice flow and damming, to the ice sheet thickness reconstruction remain unclear. To provide a better constraint for the EAIS thickness reconstruction, we have carried out new field expeditions in wider area of the central DML. In this presentation, I will talk about preliminary results from the expeditions, which show that the significant ice sheet retreat since the Pliocene-Pleistocene boundary also occurred in the central DML.