Radio echo soundings using dual-frequency 200 and 600 MHz antennas were applied on Suretta and Lupo glacier to investigate glacier thicknesses and firn stratification. On two days in October 2014, tracks of a total length of 2.4 km (Suretta) and 3.1 km (Lupo) were recorded. The post-processing was conducted using the Reflexw software package and consisted of a dewow filtering, bandpass filters, removal of horizontal constant noise and a topography migration together with a compensation for divergence losses. The observed thicknesses along the tracks (mean horizontal resolution of 20 cm) were inter-and extrapolated to the entire glacier areas. Geodetic mass balances Historic topographic maps of Suretta Sud (1962, 1970, 1995, source: Swisstopo) and Lupo glacier (1933, 1962, source: Instituto Geografico Militare) have been scanned and georeferenced. Contour lines were digitized manually and surface DEMs of 2 m resolution were created. By subtracting subsequent DEMs, volume differences could be calculated and transformed into mass changes by assuming a mean density of 0.9. The so derived time series was extended by the existing DEMs from 1982 and 2007.

Firn- and ice thickness determined by radio echo sounding on two cirque glaciers in Lombardy

R. Scotti
2015

Abstract

Radio echo soundings using dual-frequency 200 and 600 MHz antennas were applied on Suretta and Lupo glacier to investigate glacier thicknesses and firn stratification. On two days in October 2014, tracks of a total length of 2.4 km (Suretta) and 3.1 km (Lupo) were recorded. The post-processing was conducted using the Reflexw software package and consisted of a dewow filtering, bandpass filters, removal of horizontal constant noise and a topography migration together with a compensation for divergence losses. The observed thicknesses along the tracks (mean horizontal resolution of 20 cm) were inter-and extrapolated to the entire glacier areas. Geodetic mass balances Historic topographic maps of Suretta Sud (1962, 1970, 1995, source: Swisstopo) and Lupo glacier (1933, 1962, source: Instituto Geografico Militare) have been scanned and georeferenced. Contour lines were digitized manually and surface DEMs of 2 m resolution were created. By subtracting subsequent DEMs, volume differences could be calculated and transformed into mass changes by assuming a mean density of 0.9. The so derived time series was extended by the existing DEMs from 1982 and 2007.
19th Alpine Glaciology Meeting (AGM)
W. Hagg, E. Mayr, A. Heilig, W. Tamm, R. Scotti
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11585/631651
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