Brief Communication "Importance of slope-induced error correction in elevation change estimates from radar altimetry"

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 Isbr , we show that a relatively straightforward correction for slope-induced error increases elevation change rates by several metres and increases the volume change by 32% for the region of interest.