Preprints
https://doi.org/10.5194/tcd-5-565-2011
https://doi.org/10.5194/tcd-5-565-2011
 
14 Feb 2011
14 Feb 2011
Status: this preprint was under review for the journal TC but the revision was not accepted.

Comparison of direct and geodetic mass balances on an annual time scale

A. Fischer1, H. Schneider2, G. Merkel3, and R. Sailer4 A. Fischer et al.
  • 1Institute of Meteorology and Geophysics, University of Innsbruck, Austria
  • 2Institute of Mathematics, University of Innsbruck, Austria
  • 3Faculty of Geoinformation, University of Applied Sciences – Fachhochschule München, Germany
  • 4Institute of Geography, University of Innsbruck, Austria

Abstract. Very accurate airborne laserscanning (ALS) elevation data was used to calculate the annual volume changes for Hintereisferner and Kesselwandferner in the Ötztal Alps, Austria for 2001/2002–2008/2009. The comparison of the altitude of 51 recently GPS surveyed ground control points showed that the accuracy of the ALS DEMs is better than 0.3 m. The geodetic mass balance was calculated from the volume change using detailed maps of the firn cover and applying corrections for the seasonal snow cover. The maximum snow height at the time of the elevation data flight was 0.5 m averaged over the glacier surface. The volume change data was compared to in situ mass balance data for the total area and at the stakes. For the total period of 8 yr, the difference between the geodetic and the direct mass balance is 2.398 m w.e. on Hintereisferner and 1.380 m w.e. on Kesselwandferner, corresponding to about two times the mean annual mass balance. The vertical ice flow velocity was measured and found to be on the same order of magnitude as the mass balance at KWF. This is an indicator that volume change data does not allow the calculation of ablation or accumulation rates without detailed measurements or models of the vertical ice flow velocity. Therefore, only direct mass balance data allow process studies or investigation of the climatic controls of the resulting mass changes.

A. Fischer et al.

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

A. Fischer et al.

A. Fischer et al.

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