Greenland ice velocity maps from the PROMICE project
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 time series of Greenland Ice Sheet ice velocity mosaics spanning September 2016 th...
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2021
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ftdoajarticles:oai:doaj.org/article:8f9fa7d27c2d46f6b637b5ecfe10e4d6 2023-05-15T16:21:24+02:00 Greenland ice velocity maps from the PROMICE project A. Solgaard A. Kusk J. P. Merryman Boncori J. Dall K. D. Mankoff A. P. Ahlstrøm S. B. Andersen M. Citterio N. B. Karlsson K. K. Kjeldsen N. J. Korsgaard S. H. Larsen R. S. Fausto 2021-07-01T00:00:00Z https://doi.org/10.5194/essd-13-3491-2021 https://doaj.org/article/8f9fa7d27c2d46f6b637b5ecfe10e4d6 EN eng Copernicus Publications https://essd.copernicus.org/articles/13/3491/2021/essd-13-3491-2021.pdf https://doaj.org/toc/1866-3508 https://doaj.org/toc/1866-3516 doi:10.5194/essd-13-3491-2021 1866-3508 1866-3516 https://doaj.org/article/8f9fa7d27c2d46f6b637b5ecfe10e4d6 Earth System Science Data, Vol 13, Pp 3491-3512 (2021) Environmental sciences GE1-350 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/essd-13-3491-2021 2022-12-31T06:33:01Z 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 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 −1 ( − 3 m yr −1 ) and 27 m yr −1 ( − 2 m yr −1 ) for the components in an eastern and northern direction, respectively. Over stable ground the values are 8 m yr −1 (0.1 m yr −1 ) and 12 m yr −1 ( − 0.6 m yr −1 ) 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. Article in Journal/Newspaper glacier Greenland Ice Sheet Directory of Open Access Journals: DOAJ Articles Greenland Earth System Science Data 13 7 3491 3512 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 A. Solgaard A. Kusk J. P. Merryman Boncori J. Dall K. D. Mankoff A. P. Ahlstrøm S. B. Andersen M. Citterio N. B. Karlsson K. K. Kjeldsen N. J. Korsgaard S. H. Larsen R. S. Fausto Greenland ice velocity maps from the PROMICE project |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
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 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 −1 ( − 3 m yr −1 ) and 27 m yr −1 ( − 2 m yr −1 ) for the components in an eastern and northern direction, respectively. Over stable ground the values are 8 m yr −1 (0.1 m yr −1 ) and 12 m yr −1 ( − 0.6 m yr −1 ) 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. |
format |
Article in Journal/Newspaper |
author |
A. Solgaard A. Kusk J. P. Merryman Boncori J. Dall K. D. Mankoff A. P. Ahlstrøm S. B. Andersen M. Citterio N. B. Karlsson K. K. Kjeldsen N. J. Korsgaard S. H. Larsen R. S. Fausto |
author_facet |
A. Solgaard A. Kusk J. P. Merryman Boncori J. Dall K. D. Mankoff A. P. Ahlstrøm S. B. Andersen M. Citterio N. B. Karlsson K. K. Kjeldsen N. J. Korsgaard S. H. Larsen R. S. Fausto |
author_sort |
A. Solgaard |
title |
Greenland ice velocity maps from the PROMICE project |
title_short |
Greenland ice velocity maps from the PROMICE project |
title_full |
Greenland ice velocity maps from the PROMICE project |
title_fullStr |
Greenland ice velocity maps from the PROMICE project |
title_full_unstemmed |
Greenland ice velocity maps from the PROMICE project |
title_sort |
greenland ice velocity maps from the promice project |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/essd-13-3491-2021 https://doaj.org/article/8f9fa7d27c2d46f6b637b5ecfe10e4d6 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland Ice Sheet |
genre_facet |
glacier Greenland Ice Sheet |
op_source |
Earth System Science Data, Vol 13, Pp 3491-3512 (2021) |
op_relation |
https://essd.copernicus.org/articles/13/3491/2021/essd-13-3491-2021.pdf https://doaj.org/toc/1866-3508 https://doaj.org/toc/1866-3516 doi:10.5194/essd-13-3491-2021 1866-3508 1866-3516 https://doaj.org/article/8f9fa7d27c2d46f6b637b5ecfe10e4d6 |
op_doi |
https://doi.org/10.5194/essd-13-3491-2021 |
container_title |
Earth System Science Data |
container_volume |
13 |
container_issue |
7 |
container_start_page |
3491 |
op_container_end_page |
3512 |
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1766009401236258816 |