Application of PROMICE Q-Transect in Situ Accumulation and Ablation Measurements (2000-2017) to Constrain Mass Balance at the Southern Tip of the Greenland Ice Sheet ...

• Main Authors: Hermann, Mauro, Box, Jason E., Fausto, Robert S., Colgan, William, Langen, Peter L., Mottram, Ruth, Wuite, Jan, Brice, Noël, van den Broeke, Michiel R., van As, Dirk
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2018
• Subjects: Greenland; Ice Sheet
• Online Access: https://dx.doi.org/10.3929/ethz-b-000278034; http://hdl.handle.net/20.500.11850/278034

With nine southern Greenland ice sheet ablation area locations, the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) “Q‐transect” is a source of snow accumulation and ice ablation data spanning 17 years (2000 to present). Snow water equivalence measurements below equilibrium line altitude enable resolving the location and magnitude of an orographic precipitation maximum. Snow depth skillfully predicts snow water equivalence in this region, for which we find no evidence of change 2001–2017. After describing observed accumulation and ablation spatiotemporal patterns, we examine surface mass balance (SMB) in 5.5‐km HIRHAM5, 7.5‐km Modèle Atmosphèrique Régional (MAR) v3.7, and 1‐km Regional Atmospheric Climate Model (RACMO2.3p2) regional climate model (RCM) output. HIRHAM5 and RACMO2.3p2 overestimate accumulation below equilibrium line altitude by 2 times. MAR SMB is closer to observations but lacks a distinct orographic peak. RCM ablation underestimation is attributable to overestimated snowfall ... : Journal of Geophysical Research: Earth Surface, 123 (6) ...