A least-squares adjusted grounding line for the amery ICE shelf using ICESat and Landsat 8 OLI data

摘要

The grounding line (GL) is the location where ice sheet lose contact with the bed rock. Since this line is under the surface ice, it's hard to define the GL. However, the different basal condition besides the GL caused different vertical movement and a flexure is often formed at the GL. This flexure is detectable by optical images. Meanwhile the ocean-induced vertical movement is detectable by repeat track laser altimetry. In this paper, we use ten scenes of Landsat 8 optical images and NASA's Ice, Cloud, and land Elevation/Geoscience Laser Altimeter System (ICESat/GLAS) data to map the GL of Amery ice shelf (AIS). We develop a least-squares adjustment model to merge the GL derived from these two datasets in order to increase the accuracy of this new line.