Calibration of a frontal ablation parameterisation applied to Greenland's peripheral calving glaciers

• Published in: Journal of Glaciology
• Main Authors: Recinos, Beatriz, Maussion, Fabien, Noël, Brice, Möller, Marco, Marzeion, Ben
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press 2021
• Subjects: Glacier calving; glacier volume; ice dynamics; Earth-Surface Processes; Physical; chemical; mathematical & earth Sciences; Earth sciences & physical geography; Physique; chimie; mathématiques & sciences de la terre; Sciences de la terre & géographie physique; glacier; Greenland; Journal of Glaciology; Tidewater
• Online Access: https://orbi.uliege.be/handle/2268/301945; https://orbi.uliege.be/bitstream/2268/301945/1/Recinoz_2021_JoG.pdf; https://doi.org/10.1017/jog.2021.63

peer reviewed We calibrate the calving parameterisation implemented in the Open Global Glacier Model via two methods (velocity constraint and surface mass balance (SMB) constraint) and assess the impact of accounting for frontal ablation on the ice volume estimate of Greenland tidewater peripheral glaciers (PGs). We estimate an average regional frontal ablation flux of 7.38±3.45 Gta-1 after calibrating the model with two different satellite velocity products, and of 0.69±0.49 Gta-1 if the model is constrained using frontal ablation fluxes derived from independent modelled SMB averaged over an equilibrium reference period (1961-90). This second method makes the assumption that most PGs during that time have an equilibrium between mass gain via SMB and mass loss via frontal ablation. This assumption serves as a basis to assess the order of magnitude of dynamic mass loss of glaciers when compared to the SMB imbalance. The differences between results from both methods indicate how strong the dynamic imbalance might have been for PGs during that reference period. Including frontal ablation increases the estimated regional ice volume of PGs, from 14.47 to 14.64±0.12 mm sea level equivalent when using the SMB method and to 15.84±0.32 mm sea level equivalent when using the velocity method.