High-resolution radar mapping of internal layers of a subpolar ice cap, King George Island, Antarctica

Abstract

A GPR survey was carried out to investigate the structure and hydrology of King George Island subpolar ice cap, Antarctica. This studywas part of a larger investigation on the mass balance of Lange Glacier (62°07’S, 58°36’W), an outlet ice mass that is receding. The strongest signal in all reflection profiles is due to the presence of free water. Sections show strong near-surface reflectors sitting on weaker ones above the water table. Below the water table, reflectors become strong again, displaying many discrete events that reach the end of the sections. Varying antenna configuration causes an important distinction in radar response for the same subsurface. A nearby snow and ice core was used to calibrate the top section of the GPR images.