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Record #164643:

Firn-line detection on Austre Okstindbreen, Norway, with airborne multipolarization SAR / Max König, Jan-Gunnar Winther, Niels Tvis Knudsen, Tore Guneriussen.

Title: Firn-line detection on Austre Okstindbreen, Norway, with airborne multipolarization SAR / Max König, Jan-Gunnar Winther, Niels Tvis Knudsen, Tore Guneriussen.
Author(s): König, Max.
Winther, Jan-Gunnar.
Knudsen, Niels Tvis.
Guneriussen, Tore.
Date: 2001.
In: Journal of Glaciology. (2001.), Vol. 47(157) (2001)
Abstract: Examines whether firn line or equilibrium line is visible on airborne SAR imagery of Austre Okstindbreen. Uses (mostly) C-band cross-polarisation images HV to discriminate between snow/firn and ice surfaces. Discusses backscatter variation generally and analyses boundary observed at about 1250 m a.s.l., above which backscatter is considerably greater than that found below. Models stratigraphy from net balance and surface velocity data to help exclude possibility of boundary being equilibrium line. Identifies boundary as firn line created in previous years and deformed by glacier movement. Suggests that similar lines may have been misidentified as equilibrium lines in previous studies. Suggests that, as well as being more feasible with SAR, firn-line monitoring may reveal smoother, longer term climate response than equilibrium line monitoring.
Notes:

Journal of Glaciology. Vol. 47(157) :251-257 (2001).

Keywords: 551.32 -- Glaciology.
551.324.22 -- Glaciers: Austre Okstindbreen.
551.324.43 -- Land ice, regime and mass balance.
551.324.435 -- Firn line.
53.087.23 -- Remote sensing.
621.396.96 -- Radar.
E3 -- Glaciology: instruments and methods.
(*58) -- Norway.
SPRI record no.: 164643

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245 00 ‡aFirn-line detection on Austre Okstindbreen, Norway, with airborne multipolarization SAR /‡cMax König, Jan-Gunnar Winther, Niels Tvis Knudsen, Tore Guneriussen.
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500 ## ‡aJournal of Glaciology. Vol. 47(157) :251-257 (2001).
520 3# ‡aExamines whether firn line or equilibrium line is visible on airborne SAR imagery of Austre Okstindbreen. Uses (mostly) C-band cross-polarisation images HV to discriminate between snow/firn and ice surfaces. Discusses backscatter variation generally and analyses boundary observed at about 1250 m a.s.l., above which backscatter is considerably greater than that found below. Models stratigraphy from net balance and surface velocity data to help exclude possibility of boundary being equilibrium line. Identifies boundary as firn line created in previous years and deformed by glacier movement. Suggests that similar lines may have been misidentified as equilibrium lines in previous studies. Suggests that, as well as being more feasible with SAR, firn-line monitoring may reveal smoother, longer term climate response than equilibrium line monitoring.
650 07 ‡a551.32 -- Glaciology.‡2udc
650 07 ‡a551.324.22 -- Glaciers: Austre Okstindbreen.‡2udc
650 07 ‡a551.324.43 -- Land ice, regime and mass balance.‡2udc
650 07 ‡a551.324.435 -- Firn line.‡2udc
650 07 ‡a53.087.23 -- Remote sensing.‡2udc
650 07 ‡a621.396.96 -- Radar.‡2udc
650 07 ‡aE3 -- Glaciology: instruments and methods.‡2local
651 #7 ‡a(*58) -- Norway.‡2udc
700 1# ‡aKönig, Max.
700 1# ‡aWinther, Jan-Gunnar.
700 1# ‡aKnudsen, Niels Tvis.
700 1# ‡aGuneriussen, Tore.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 47(157) (2001) ‡wSPRI-20534
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