Preprints
https://doi.org/10.5194/essd-2021-46
https://doi.org/10.5194/essd-2021-46

  23 Feb 2021

23 Feb 2021

Review status: this preprint is currently under review for the journal ESSD.

Greenland ice velocity maps from the PROMICE project

Anne Solgaard1, Anders Kusk2, John Peter Merryman Boncori2, Jørgen Dall2, Kenneth D. Mankoff1, Andreas P. Ahlstrøm1, Signe B. Andersen1, Michele Citterio1, Nanna B. Karlsson1, Kristian K. Kjeldsen1, Niels J. Korsgaard1, Signe H. Larsen1, and Robert S. Fausto1 Anne Solgaard et al.
  • 1The Geological Survey of Denmark and Greenland, Østervoldgade 10, 1350 København K, Danmark
  • 2Technical University of Denmark - National Space Institute, Ørsteds Plads 348, 2800 Kongens Lyngby, Denmark

Abstract. We present the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) ice velocity product (https://doi.org/10.22008/promice/data/sentinel1icevelocity/greenlandicesheet) (Solgaard and Kusk, 2021)) which is a September 2016 through present time series of Greenland Ice Sheet ice-velocity mosaics. The product is based on Sentinel-1 synthetic aperture radar data and has a 500 m spatial resolution. A new mosaic is available every 12 days and span two consecutive Sentinel-1 cycles (24 days). The product is made available within ~10 days of the last acquisition and includes all possible 6 and 12 day pairs within the two Sentinel-1A cycles. We describe our operational processing chain in high detail from data selection, mosaicking and error estimation to final outlier removal. The product is validated against in-situ GPS measurements. We find that the standard deviation of the difference between satellite and GPS derived velocities is 20 m/yr and 27 m/yr for the vx and vy components, respectively. This is within the expected bounds, however, we expect that the GPS measurements carry a considerable part of this uncertainty. We investigate variations in coverage from both a temporal and spatial perspective. Best spatial coverage is achieved in winter due to excellent data coverage and high coherence, while summer mosaics have the lowest coverage due to widespread melt. The southeast Greenland Ice Sheet margin, along with other areas of high accumulation and melt, often have gaps in the ice velocity mosaics. The spatial comprehensiveness and temporal consistency make the product ideal for monitoring and studying ice-sheet wide ice discharge and dynamics of glaciers.

Anne Solgaard et al.

Status: open (until 20 Apr 2021)

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Anne Solgaard et al.

Data sets

Greenland Ice Velocity from Sentinel-1 Edition 2 Anne Solgaard and Anders Kusk https://doi.org/10.22008/promice/data/sentinel1icevelocity/greenlandicesheet

Anne Solgaard et al.

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Short summary
The PROMICE ice-velocity product is a time series of Greenland Ice Sheet ice-velocity mosaics spanning September 2016 to present. It is derived from Sentinel-1 SAR data and has a spatial resolution of 500 m. Each mosaic spans 24 days (two Sentinel-1 cycles) and a new one is posted every 12 days (every Sentinel-1A cycle). The spatial comprehensiveness and temporal consistency make the product ideal for monitoring and studying ice-sheet wide ice discharge and dynamics of glaciers.