Re-definition and Validation of the Grounding Line of Amery Ice Shelf,East Antarctica

This paper re-defines the grounding line(GL) of Amery Ice Shelf(AIS),East Antarctica,utilizing radio echo sounding(RES) data.It was indicated that the GL southmostly extended to 73.2°S,about 500 km away from the ice front.Two representative profiles are selected to validate the above preliminary conclusion,by ratio of bed depth to ice thickness,and height divergence between the measured height and the calculated value according to ice thickness by hydrostatic equilibrium theory.Moreover,the conclusion is further validated by ERS-1 digital elevation model(DEM) gridded 5 km and RADARSAT Antarctic mapping project(RAMP) 1km-gridded DEM,and tidal noise detected by in situ GPS measurements.Finally,the floating ice region of the whole ice stream is illustrated according to the hydrostatic equilibrium theory.