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Neckel, Niklas; Franke, Steven; Helm, Veit (2021): Locations, outlines and ICESat-2 tracks of active lakes at the onset of the Jutulstraumen Glacier (Antarctica). PANGAEA, https://doi.org/10.1594/PANGAEA.927120

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Abstract:
We analysed a 6 year time series of displacement maps from Sentinel-1 SAR interferometry in the upstream region of Dronning Maud Lands Jutulstraumen Glacier (Antarctica). Our results reveal short-term cascade-like events of subsidence and uplift of the ice surface, which we interpret as drainage and filling of subglacial water pockets. This indicates a periodic transport of subglacial water through an interconnected drainage system. The water re-location events in this study are located in a slow flowing region 225~km upstream of the grounding line. An examination of high-resolution ultra-wideband radar data and the hydropotential gradient reveals that subglacial water is moving downstream along a canyon-like system of local valleys.
Keyword(s):
Antarctica; AWI UWB; DInSAR; Dronning Maud Land; ICESat-2; Jutulstraumen; Sentinel-1; subglacial hydrology; subglacial lakes
Supplement to:
Neckel, Niklas; Franke, Steven; Helm, Veit; Drews, Reinhard; Jansen, Daniela (2021): Evidence of cascading subglacial water flow at Jutulstraumen Glacier (Antarctica) derived from Sentinel‐1 and ICESat‐2 measurements. Geophysical Research Letters, 48(20), https://doi.org/10.1029/2021GL094472
Coverage:
Median Latitude: -72.629399 * Median Longitude: 1.687200 * South-bound Latitude: -75.001133 * West-bound Longitude: -0.500000 * North-bound Latitude: -71.580000 * East-bound Longitude: 2.472737
Date/Time Start: 2018-12-22T09:12:50 * Date/Time End: 2018-12-27T17:48:48
Event(s):
Jutulstraumen_Glacier * Latitude: -71.580000 * Longitude: -0.500000 * Location: Dronning Maud Land, Antarctica * Method/Device: Multiple investigations (MULT)
P6_215_UWB_2018_1812220301 * Latitude Start: -71.955397 * Longitude Start: 2.472649 * Latitude End: -75.001112 * Longitude End: 0.061624 * Date/Time Start: 2018-12-22T09:12:50 * Date/Time End: 2018-12-22T13:18:49 * Campaign: P6_215_UWB_2018 (JuRaS - Jutulstraumen Radar Stratigraphy) * Basis: POLAR 6 * Method/Device: Aircraft (AC)
P6_215_UWB_2018_1812240401 * Latitude Start: -71.955404 * Longitude Start: 2.472615 * Latitude End: -71.955424 * Longitude End: 2.472269 * Date/Time Start: 2018-12-24T10:11:58 * Date/Time End: 2018-12-24T13:41:55 * Campaign: P6_215_UWB_2018 (JuRaS - Jutulstraumen Radar Stratigraphy) * Basis: POLAR 6 * Method/Device: Aircraft (AC)
Comment:
Here we provide:
1. outlines of the areas of subsidence and uplift, which represent the locations of active subglacial lakes D, E and F (see Figure 1 in the publication connected to this data set).
* the outlines are provided as shapefiles (polygons)
* Filename: JG_interferometry_lake_outlines.shp
* CRS: EPSG:3031.
2. a csv file containing the lake center coordinates (JG_lake_coordinates)
3. processed ICESat-2 tracks intersecting with the lake outlines (ICE_a and ICE_b in the manuscript; see Figure 2 for details). The data is stored in csv files and archived in ICESat-2_tracks.zip.
* ICE_a track specification: RGT 0732 - GT3l
* ICE_b track specification: RGT 1235 - GT1r
Contact: Steven Franke steven.franke@awi.de and Niklas Neckel niklas.neckel@awi.de
Size:
188.5 kBytes

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