GNSS uplift time series and ice surface elevation changes

• Main Authors: Khan, Shfaqat Abbas, Hansen, Karina
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: elastic uplift; GNSS; Glaciers; Discharge; Airborne Topographic Mapper; Jakobshavn; Jakobshavn isbræ; Kangerlussuaq
• Online Access: https://doi.org/10.5061/dryad.vq83bk3sc

We use Global Navigation Satellite System (GNSS) stations attached to bedrock to measure elastic displacements of the solid Earth caused by dynamic thinning near the glacier terminus. When we compare our results with discharge, we find a time lag between glacier speedup/slowdown and onset of dynamic thinning/thickening. Our results show that dynamic thinning/thickening on Jakobshavn Isbræ occurs 0.87 ± 0.07 years before speedup/slowdown. This implies that using GNSS time series we are able to predict speedup/slowdown of Jakobshavn Isbræ by up to 10.4 months. For Kangerlussuaq Glacier the lag between thinning/thickening and speedup/slowdown is 0.37 ± 0.17 years (4.4 months). Annual elevation changes are provided in UTM zone 22 coordinates. The third column in each file show ice surface elavation change (m/yr). UTM coordinates are provided in Easting (meter), Northing (meter) in meters. Example of data file: # Elevation change between 2013 and 2014 using NASA's Airborne Topographic Mapper (ATM) flights. # UTM zone 22 easting northing dh m m m/yr 529805.00 7635257.00 -0.578 529804.00 7635172.00 0.170 GNSS uplift time series are provided as weekly solutions. The data files contain five columns. column 1: time in years. column 2: uplift in mm (weekly solution). column 3: standars deviation of weekly solution. column 4: SMB induced elastic uplift in mm column 5: standars deviation in mm of SMB induced elastic uplift Funding provided by: Horizon 2020 Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100007601 Award Number: INTAROS GA No. 727890