Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/1245
Authors: | Bianchi, C.* Chiappini, M.* Tabacco, I. E.* Zirizzotti, A.* Zuccheretti, E.* |
Title: | Quasi-parabolic reflecting bottom surfaces of the Drygalski Antarctic floating ice tongue | Issue Date: | Jul-2001 | Series/Report no.: | 3/44 (2001) | URI: | http://hdl.handle.net/2122/1245 | Keywords: | radio echo sounding radio glaciology glacier ice tongues |
Subject Classification: | 04. Solid Earth::04.02. Exploration geophysics::04.02.05. Downhole, radioactivity, remote sensing, and other methods | Abstract: | Very high frequency deep radio sounding systems for ice thickness measurements are practically the only useful apparatuses for large scale radar flight surveys in polar regions. The morphology of the bottom surface of an Antarctic floating ice tongue, in the Ross Sea area, East Antarctica, was studied using the arrival times of signal echoes of the radio sounding system. The amplitude variations of radar signals from the reflecting surface were analyzed to determine the gain or the loss of the reflectors. Such surfaces show quasi-parabolic geometrical shapes at the ice/water interface with both concave and convex faces towards the sounding system. Electromagnetic analysis performed on radar echoes indicates that amplitude variations detected by the antenna are focusing or defocusing effects only due to the reflector's shape. A factor in the radar equation that represents the surface shape when coherent reflectors are involved is introduced. This factor allows us to determine more precisely the morphology and electromagnetic characteristics of the interface between the media investigated by means of radio echo sounding. |
Appears in Collections: | Annals of Geophysics |
Show full item record
Page view(s) 1
14,419
checked on Apr 24, 2024
Download(s) 50
200
checked on Apr 24, 2024