Ice displacement anomalies documented in "Episodic Subglacial Drainage Outbursts Below the Northeast Greenland Ice Stream"

<p>This repository contains data documenting ice displacements resulting from a cascade of subglacial drainage outbursts below the Northeast Greenland Ice Stream (NEGIS). The data is presented and analyzed in the manuscript: "Andersen et al. (2023) <em>Episodic Subglacial Drainage Outbursts Below the Northeast Greenland Ice Stream</em>" (submitted to Geophysical Research Letters).</p> <p><br></p> <p><br></p> <p>The repository contains the following:</p> <p><br></p> <p><em>- UpliftEvents_vlosDiff_T112D.zip </em>a collection of GeoTIFF files, each containing measurements of ice displacement anomalies for a local inferred uplift event. The displacements are measured with the DInSAR (Differential Synthetic Aperture Radar Interferometry) method using Sentinel-1 satellite data. The displacement anomalies are projected to the slanted satellite line-of-sight vector, and are given as a velocity anomaly (in units of meters/year), as this is the output of the applied DInSAR algorithm. Converting the observed line-of-sight anomaly, <em>v</em>_LoS, to a vertical displacement, <em>d</em>_vert,is then done through:</p> <p><br></p> <p><em>               d</em>_vert = <em>v</em>_LoS/ cos(a) * <em>T      </em>(1)</p> <p><br></p> <p>where <em>a</em> is the local incidence angle of the satellite line-of-sight and <em>T</em> is the temporal baseline (6 days for all measurements). All measurements are from the descending Sentinel-1 track 112. Filenames follow the format "vlosDiff__YYYYMMDD_YYYYMMDD_X.tif", where the two dates reflect the first and second acquisition dates used to make the measurement and X refers to the event number/index (some retrievals contain multiple individual uplift events). Measurements are provided on a 50x50 m grid (EPSG:3413).</p> <p><br></p> <p>- <em>T112D_incidence_angle.tif </em>GeoTIFF file containing the incidence angle for Sentinel-1 track 112 over the entire study area (can be used to convert line-of-sight anomaly measurements to vertical displacements, as per eq. (1) above). Provided in 50x50 m grid (EPSG:3413) in units of degrees.</p> <p><br></p> <p>- <em>InferredDrainagePathways.zip</em> Subglacial drainage propagation pathways inferred from all DInSAR measurements carried out in the study (cf. Figure 1 of the manuscript). </p> <p><br></p> <p><br></p> <p>Corresponding author: Jonas Kvist Andersen (jkvand@space.dtu.dk)</p> <p><br></p> <p><br></p> <p><br></p>