HR: 1340h
AN: C43A-0219    [Abstracts]
TI: Preliminary Results Using C-band Ground Penetrating Radar to Determine Backscatter Sources Within Glaciers
AU: * Langley, K
EM: kirstyl@geo.uio.no
AF: University of Oslo, Department of Geosciences, Blindern PO Box 1047, Oslo, NO-0316 Norway
AU: Hamran, S
EM: s.e.hamran@geo.uio.no
AF: University of Oslo, Department of Geosciences, Blindern PO Box 1047, Oslo, NO-0316 Norway
AU: Hagen, J
EM: j.o.m.hagen@geo.uio.no
AF: University of Oslo, Department of Geosciences, Blindern PO Box 1047, Oslo, NO-0316 Norway
AU: Melvold, K
EM: kjetil.melvold@geo.uio.no
AF: University of Oslo, Department of Geosciences, Blindern PO Box 1047, Oslo, NO-0316 Norway
AU: Baumberger, A
EM: anderbau@student.matnat.uio.no
AF: University of Oslo, Department of Geosciences, Blindern PO Box 1047, Oslo, NO-0316 Norway
AU: Hogda, K
EM: Kjell-Arild.Hogda@itek.norut.no
AF: Norut IT, Postboks 6434, Forskningsparken, Tromso, 9294 Norway
AU: Storvold, R
EM: Rune.Storvold@itek.norut.no
AF: Norut IT, Postboks 6434, Forskningsparken, Tromso, 9294 Norway
AU: Kohler, J
EM: jack.kohler@npolar.no
AF: Norwegian Polar Institute, Polarmiljosenteret, Tromso, 9296 Norway
AU: Brandt, O
EM: Ola.Brandt@npolar.no
AF: Norwegian Polar Institute, Polarmiljosenteret, Tromso, 9296 Norway
AB: Ground Penetrating Radar (GPR) operating at 5.3GHz (C-band), the same frequency as the Advanced Synthetic Aperture Radar (ASAR), is used to resolve the depth resolution not retrievable from the ASAR data. We present results from the first field season, April 2004. Two GPR instruments, one at 5.3GHz (C-Band) and the other at 800MHz, were used to take profiles along the centre line of Kongsvegen, Svalbard. ASAR images were acquired for this same time period. In addition cores and snow pits were taken along the centre line. Data from the two GPR instruments is very comparable. Both see the same internal layering and transitions in glacial facies. In order to make a comparison between the C-band GPR and the ASAR data, the radar equation is used to convert the GPR signal to backscatter cross section as a function of depth. Plotting this value reveals the backscatter contribution over depth. The depth at which most backscattering occurs varies up glacier. Integration of the sigma value over depth gives the single backscatter coefficient value obtained by ASAR. We see that the ASAR signal is in fact the result of all the backscatter sources identified with the C-band GPR. The core and snow pit data will provide the means by which to quantify the physical nature of the backscatters seen in the GPR data. Next year a fully polarimetric GPR will be used allowing greater flexibility and a more accurate comparison with the ASAR data.
DE: 6969 Remote sensing
DE: 1863 Snow and ice (1827)
SC: Cryosphere [C]
MN: 2004 AGU Fall Meeting