Supraglacial stream discharge measurements from six catchments within the Pâqitsoq region of Sermeq Avannarleq, western Greenland Ice Sheet 2017 -2018 ...

• Main Authors: Trunz, Celia, Mejia, Jessica, Covington, Matthew, Siegel, Victoria, Conlon, Brandon, Gulley, Jason
• Format: Dataset
• Language: English
• Published: NSF Arctic Data Center 2021
• Subjects: Discharge; Supraglacial stream; unit hydrograph; hydrology; glacial hydrology; supraglacial; catchment; Avannarleq; Greenland; Sermeq Avannarleq; Ice Sheet
• Online Access: https://dx.doi.org/10.18739/a2dn3zx27; https://arcticdata.io/catalog/view/doi:10.18739/A2DN3ZX27

Meltwater produced on the Greenland Ice Sheet (GrIS) surface is routed through complex networks of supraglacial streams across the ice surface. Most of the supraglacial streams on the GrIS terminate into moulins. Moulins are vertical conduits that penetrate through the entire ice thickness and deliver meltwater to the ice sheet's bed where water pressure fluctuations can modulate sliding speed. A poorly constrained parameter in glacial hydrological models is the timing and the volume of meltwater entering moulins within the GrIS ablation area. Here, we present direct measurements of supraglacial stream discharge within six catchments within the GrIS ablation area during the 2017 and 2018 melt seasons. In 2017 we measured stream discharge using a fluorescent dye dilution method. We continuously injected a Rhodamine WT solution (known concentration and pumping rate) into supraglacial streams and measured the dye concentration with a Cyclops fluorometer installed 50-100 meters downstream of the dye injection ...