Moulin hydrological measurements from Sermeq Avannarleq, West Greenland Ice Sheet from 2017-2018

• Main Authors: Mejia, Jessica, Trunz, Celia, Covington, Matthew, Gulley, Jason, Breithaupt, Charles
• Format: Dataset
• Language: English
• Published: NSF Arctic Data Center 2020
• Subjects: Moulin; Moulin Hydrology; Supraglacial stream stage; Greenland Ice Sheet; Ice Sheet Hydrology; Ablation area; Sermeq Avannarleq; Avannarleq; Greenland; Ice Sheet
• Online Access: https://dx.doi.org/10.18739/a2m03xz13; https://arcticdata.io/catalog/view/doi:10.18739/A2M03XZ13

We instrumented several moulins during the 2017 and 2018 melt seasons within the ablation area of Sermeq Avannarleq, in the Paakitsoq region of west Greenland. We simultaneously measured supraglacial stream stage to constrain the timing of peak recharge into each moulin, while also monitoring moulin water levels, a proxy for subglacial water pressure. JEME and RADI are the names of the moulins. We followed standard GPS station naming conventions (4-character names). In July 2017, we instrumented JEME moulin and the supraglacial stream terminating into the moulin. JEME moulin was located at our 'low camp' field site with an elevation of 765.8 m.a.s.l. (meters above sea level), and an ice thickness of ~500 m. We also instrumented RADI moulin, short for "Radical" moulin and supraglacial stream, located at our high camp field site with an elevation of 933.2 m.a.s.l., and an ice thickness of approximately 712 m. In 2017, our supraglacial stream data ends by 10 August 2017 when heavy snowfall filled both supraglacial channels, thus preventing stage measurements. Both JEME and RADI moulins closed over the winter of 2017-2018, neither being reactivated during the 2018 melt season. Consequently, our data show water level measurements as moulins were closing, with time series data ending 18 May 2018 for RADI moulin, presumably when the sensor froze within the moulin, and 20 July 2018 for JEME moulin, when we returned to the field. In 2018, we instrumented "Pirate moulin" which opened in the same place JEME moulin was the year before.