High-resolution subglacial topography around Dome Fuji, Antarctica, based on ground-based radar surveys over 30 years

Abstract. The retrieval of continuous ice core records more than 1 Myr is an important challenge in palaeo-climatology. For identifying suitable sites for drilling such ice, knowledge the subglacial topography and englacial layering crucial. this purpose, extensive ground-based radar surveys were carried out over Dome Fuji East Antarctic plateau during 2017/18 2018/19 austral summers by Japanese Research Expedition, on basis conducted previous ? 30 years. High-gain Yagi antennae used to improve antenna beam directivity, thereby significantly decreasing hyperbolic features unfocused along-track diffraction hyperbolae echoes from mountainous ice–bedrock interfaces. We combined new thickness data with data, recorded since 1980s, generate accurate high-spatial-resolution (up 0.5 km between survey lines) map. This map revealed a complex landscape composed networks valleys highlands. Based map, we examined roughness ice–bed interface, bed surface slope, driving stress hydrological condition. These products analyses set substantial constraints possible locations drilling. In addition, our was compared few maps compiled earlier independent efforts based airborne examine difference datasets. Our analysis suggests that widely available should be validated situ observations where possible.