Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya
We have determined the ice-surface velocities of the Academy of Sciences Ice Cap, Severnaya Zemlya, Russian Arctic, during the period November 2016 – November 2017, using intensity offset-tracking of Sentinel-1 synthetic-aperture radar images. We used the average of 54 pairs of weekly velocities (wi...
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ftdoajarticles:oai:doaj.org/article:8b19b11cb9cb44e082a37e95468b8fce 2023-05-15T15:08:31+02:00 Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya P. Sánchez-Gámez F. J. Navarro J. A. Dowdeswell E. De Andrés 2020-04-01T00:00:00Z https://doi.org/10.31857/S2076673420010020 https://doaj.org/article/8b19b11cb9cb44e082a37e95468b8fce RU rus Nauka https://ice-snow.igras.ru/jour/article/view/779 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.31857/S2076673420010020 https://doaj.org/article/8b19b11cb9cb44e082a37e95468b8fce Лëд и снег, Vol 60, Iss 1, Pp 19-28 (2020) айсберговый сток арктика ледниковый купол отёл ледников поверхностная скорость движения ледника северная земля Science Q article 2020 ftdoajarticles https://doi.org/10.31857/S2076673420010020 2023-03-19T01:40:11Z We have determined the ice-surface velocities of the Academy of Sciences Ice Cap, Severnaya Zemlya, Russian Arctic, during the period November 2016 – November 2017, using intensity offset-tracking of Sentinel-1 synthetic-aperture radar images. We used the average of 54 pairs of weekly velocities (with both images in each pair separated by a12-day period) to estimate the mean annual ice discharge from the ice cap. We got an average ice discharge for 2016–2017 of 1,93±0,12 Gt a−1, which is equivalent to −0,35±0,02 m w.e. a−1 over the whole area of the ice cap. The difference from an estimate of ~1,4 Gt a−1 for 2003–2009 can be attributed to the initiation of ice-stream flow in Basin BC sometime between 2002 and 2016. Since the front position changes between both periods have been negligible, ice discharge is equivalent to calving flux. We compare our results for calving flux with those of previous studies and analyse the possible drivers of the changes observed along the last three decades. Since these changes do not appear to have responded to environmental changes, we conclude that the observed changes are likely driven by the intrinsic characteristics of the ice cap governing tidewater glacier dynamics. Article in Journal/Newspaper Arctic Ice cap Severnaya Zemlya Tidewater Арктика Directory of Open Access Journals: DOAJ Articles Arctic Severnaya Zemlya ENVELOPE(98.000,98.000,79.500,79.500) Ice and Snow 60 1 19 28 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
айсберговый сток арктика ледниковый купол отёл ледников поверхностная скорость движения ледника северная земля Science Q |
spellingShingle |
айсберговый сток арктика ледниковый купол отёл ледников поверхностная скорость движения ледника северная земля Science Q P. Sánchez-Gámez F. J. Navarro J. A. Dowdeswell E. De Andrés Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya |
topic_facet |
айсберговый сток арктика ледниковый купол отёл ледников поверхностная скорость движения ледника северная земля Science Q |
description |
We have determined the ice-surface velocities of the Academy of Sciences Ice Cap, Severnaya Zemlya, Russian Arctic, during the period November 2016 – November 2017, using intensity offset-tracking of Sentinel-1 synthetic-aperture radar images. We used the average of 54 pairs of weekly velocities (with both images in each pair separated by a12-day period) to estimate the mean annual ice discharge from the ice cap. We got an average ice discharge for 2016–2017 of 1,93±0,12 Gt a−1, which is equivalent to −0,35±0,02 m w.e. a−1 over the whole area of the ice cap. The difference from an estimate of ~1,4 Gt a−1 for 2003–2009 can be attributed to the initiation of ice-stream flow in Basin BC sometime between 2002 and 2016. Since the front position changes between both periods have been negligible, ice discharge is equivalent to calving flux. We compare our results for calving flux with those of previous studies and analyse the possible drivers of the changes observed along the last three decades. Since these changes do not appear to have responded to environmental changes, we conclude that the observed changes are likely driven by the intrinsic characteristics of the ice cap governing tidewater glacier dynamics. |
format |
Article in Journal/Newspaper |
author |
P. Sánchez-Gámez F. J. Navarro J. A. Dowdeswell E. De Andrés |
author_facet |
P. Sánchez-Gámez F. J. Navarro J. A. Dowdeswell E. De Andrés |
author_sort |
P. Sánchez-Gámez |
title |
Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya |
title_short |
Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya |
title_full |
Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya |
title_fullStr |
Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya |
title_full_unstemmed |
Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya |
title_sort |
surface velocities and calving flux of the academy of sciences ice cap, severnaya zemlya |
publisher |
Nauka |
publishDate |
2020 |
url |
https://doi.org/10.31857/S2076673420010020 https://doaj.org/article/8b19b11cb9cb44e082a37e95468b8fce |
long_lat |
ENVELOPE(98.000,98.000,79.500,79.500) |
geographic |
Arctic Severnaya Zemlya |
geographic_facet |
Arctic Severnaya Zemlya |
genre |
Arctic Ice cap Severnaya Zemlya Tidewater Арктика |
genre_facet |
Arctic Ice cap Severnaya Zemlya Tidewater Арктика |
op_source |
Лëд и снег, Vol 60, Iss 1, Pp 19-28 (2020) |
op_relation |
https://ice-snow.igras.ru/jour/article/view/779 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.31857/S2076673420010020 https://doaj.org/article/8b19b11cb9cb44e082a37e95468b8fce |
op_doi |
https://doi.org/10.31857/S2076673420010020 |
container_title |
Ice and Snow |
container_volume |
60 |
container_issue |
1 |
container_start_page |
19 |
op_container_end_page |
28 |
_version_ |
1766339874913255424 |