Details

Autor(en) / Beteiligte

• Vijay, Saurabh
• King, Michalea D.
• Howat, Ian M.
• Solgaard, Anne M.
• Khan, Shfaqat Abbas
• Noël, Brice

Titel

Greenland ice-sheet wide glacier classification based on two distinct seasonal ice velocity behaviors

Ist Teil von

• Journal of glaciology, 2021-12, Vol.67 (266), p.1241-1248

Ort / Verlag

Cambridge, UK: Cambridge University Press

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Greenland glaciers exhibit variable seasonal velocity signals that may reflect differences in subglacial hydrology. Here, we conduct a first GrIS-wide glacier classification based on seasonal velocity patterns derived from 2017 Sentinel-1 radar data. Our classification focuses on two distinct seasonal ice velocity patterns, with the first (type-2 from Moon and others, 2014) showing periods of both speedup and slowdown during the melt season, and the second (type-3) instead showing a longer period of slowdown from elevated velocities in the winter and spring. We analyze 221 glaciers in 2017 and show that 48 exhibit type-2 behavior, and 72 exhibit type-3 behavior. We extend the classification to 2018 and 2019 and find that while the glaciers meeting each criterion vary year to year, type-2 is consistently more common in the northern regions and type-3 is more common in the south. Our results highlight the varied impact of meltwater on subglacial drainage systems and glacier flow in Greenland.