Abstract
The Programme for Monitoring of the Greenland Ice Sheet (PROMICE) has measured ice-sheet elevation and thickness via repeat airborne surveys circumscribing the ice sheet at an average elevation of 1708 ± 5 m (Sørensen et al. 2018). We refer to this 5415 km survey as the ‘PROMICE perimeter’. Here, we assess ice-sheet mass balance following the input-output approach of Andersen et al. (2015). We estimate ice-sheet output, or the ice discharge across the ice-sheet grounding line, by applying downstream corrections to the ice flux across the PROMICE perimeter. We subtract this ice discharge from ice-sheet input, or the area-integrated, ice sheet surface mass balance, estimated by a regional climate model. While Andersen et al. (2015) assessed ice-sheet mass balance in 2007 and 2011, this updated input-output assessment now estimates the annual sea-level rise contribution from eighteen sub-sectors of the Greenland ice sheet over the 1995–2015 period.
Highlights
The Programme for Monitoring of the Greenland Ice Sheet (PROMICE) has measured ice-sheet elevation and thickness via repeat airborne surveys circumscribing the ice sheet at an average elevation of 1708 ± 5 m (Sørensen et al 2018)
Ice discharge (D) at the grounding line is derived from downstream rate of change in ice volume (V.ds ) and surface mass balance (b. ds) corrections applied to the ice flux (F) observed through the PROMICE perimeter (Andersen et al 2015)
Ice discharge is calculated as the ice flux across the PROMICE perimeter, corrected for downstream mass changes due to surface mass balance and changing ice volume (Fig. 2)
Summary
GEUS Bulletin is free to individuals and institutions in electronic form. While Andersen et al (2015) assessed ice-sheet mass balance in 2007 and 2011, this updated input-output assessment estimates the annual sea-level rise contribution from eighteen sub-sectors of the Greenland ice sheet over the 1995–2015 period. Ice discharge is calculated as the ice flux across the PROMICE perimeter, corrected for downstream mass changes due to surface mass balance and changing ice volume (Fig. 2). Ice flux (F) across the PROMICE perimeter within a given ice-sheet sub-sector is calculated as: F
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