Publication Abstracts
Solgaard et al. 2021
Solgaard, A., A. Kusk, J.P. Merryman Boncori, J. Dall, , A.P. Ahlstrøm, S.B. Andersen, M. Citterio, N.B. Karlsson, K.K. Kjeldsen, N.J. Korsgaard, S.H. Larsen, and R.S. Fausto, 2021: Greenland ice velocity maps from the PROMICE project. Earth Syst. Sci. Data, 13, no. 7, 3491-3512, doi:10.5194/essd-13-3491-2021.
We present the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) Ice Velocity product, which is a time series of Greenland Ice Sheet ice velocity mosaics spanning September 2016 through to the present. The product is based on Sentinel-1 synthetic aperture radar data and has a 500 m grid spacing. A new mosaic is available every 12 d and spans two consecutive Sentinel-1 cycles (24 d). The product is made available within ∼10 d of the last acquisition and includes all possible 6 and 12 d pairs within the two Sentinel-1A cycles. We describe our operational processing chain 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 (and bias) is 20 m/yr (-3 m/yr) and 27 m/yr (-2 m/yr) for the components in an eastern and northern direction, respectively. Over stable ground the values are 8 m/yr (0.1 m/yr) and 12 m/yr (-0.6 m/yr) in an eastern and northern direction, respectively. This is within the expected values; 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. The best spatial coverage is achieved in winter due to the comprehensive data coverage by Sentinel-1 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 has gaps in the ice velocity mosaics. The spatial comprehensiveness and temporal consistency make the product ideal both for monitoring and for studying ice-sheet-wide and glacier-specific ice discharge and dynamics of glaciers on seasonal scales.
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BibTeX Citation
@article{so08300m,
author={Solgaard, A. and Kusk, A. and Merryman Boncori, J. P. and Dall, J. and Mankoff, K. D. and Ahlstrøm, A. P. and Andersen, S. B. and Citterio, M. and Karlsson, N. B. and Kjeldsen, K. K. and Korsgaard, N. J. and Larsen, S. H. and Fausto, R. S.},
title={Greenland ice velocity maps from the PROMICE project},
year={2021},
journal={Earth System Science Data},
volume={13},
number={7},
pages={3491--3512},
doi={10.5194/essd-13-3491-2021},
}
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RIS Citation
TY - JOUR ID - so08300m AU - Solgaard, A. AU - Kusk, A. AU - Merryman Boncori, J. P. AU - Dall, J. AU - Mankoff, K. D. AU - Ahlstrøm, A. P. AU - Andersen, S. B. AU - Citterio, M. AU - Karlsson, N. B. AU - Kjeldsen, K. K. AU - Korsgaard, N. J. AU - Larsen, S. H. AU - Fausto, R. S. PY - 2021 TI - Greenland ice velocity maps from the PROMICE project JA - Earth Syst. Sci. Data JO - Earth System Science Data VL - 13 IS - 7 SP - 3491 EP - 3512 DO - 10.5194/essd-13-3491-2021 ER -
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