Quantifying supraglacial meltwater pathways in the Paakitsoq region, West Greenland

Conrad Koziol, Neil Arnold, Allen Pope, William Colgan

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

24 Citationer (Scopus)

Abstrakt

Increased summer ice velocities on the Greenland ice sheet are driven by meltwater input to the subglacial environment. However, spatial patterns of surface input and partitioning of meltwater between different pathways to the base remain poorly understood. To further our understanding of surface drainage, we apply a supraglacial hydrology model to the Paakitsoq region, West Greenland for three contrasting melt seasons. During an average melt season, crevasses drain ~47% of surface runoff, lake hydrofracture drains ~3% during the hydrofracturing events themselves, while the subsequent surface-to-bed connections drain ~21% and moulins outside of lake basins drain ~15%. Lake hydrofracture forms the primary drainage pathway at higher elevations (above ~850 m) while crevasses drain a significant proportion of meltwater at lower elevations. During the two higher intensity melt seasons, model results show an increase (~5 and ~6% of total surface runoff) in the proportion of runoff drained above ~1300 m relative to the melt season of average intensity. The potential for interannual changes in meltwater partitioning could have implications for how the dynamics of the ice sheet respond to ongoing changes in meltwater production.

OriginalsprogEngelsk
Sider (fra-til)464-476
Antal sider13
TidsskriftJournal of Glaciology
Vol/bind63
Udgave nummer239
DOI
StatusUdgivet - 1 jun. 2017
Udgivet eksterntJa

Programområde

  • Programområde 5: Natur og klima

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