Articles | Volume 6, issue 2
The Cryosphere, 6, 447–451, 2012

Special issue: Ice2sea – estimating the future contribution of continental...

The Cryosphere, 6, 447–451, 2012

Brief communication 03 Apr 2012

Brief communication | 03 Apr 2012

Brief communication "Importance of slope-induced error correction in volume change estimates from radar altimetry"

R. T. W. L. Hurkmans, J. L. Bamber, and J. A. Griggs R. T. W. L. Hurkmans et al.
  • Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, UK

Abstract. In deriving elevation change rates (dH/dt) from radar altimetry, the slope-induced error is usually assumed to cancel out in repeat measurements. These measurements, however, represent a location that can be significantly further upslope than assumed, causing an underestimate of the basin-integrated volume change. In a case-study for the fast-flowing part of Jakobshavn Isbræ, we show that a relatively straightforward correction for slope-induced error increases elevation change rates by up to several metres per year and significantly reduces the volume change error with respect to laser altimetry for the area of interest.