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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Published in:Espacio Tiempo y Forma. Serie VI, Geografía
Main Authors: P. Sánchez-Gámez, F. Navarro J., J. Dowdeswell A., E. De Andrés
Other Authors: This study has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 727890 and from Agencia Estatal de Investigación under grant CTM2017-84441-R of the Spanish Estate Plan for R & D. The radio-echo sounding campaign was funded by grants GR3/9958 and GST/02/2195 to JAD from the UK Natural Environment Research Council. Copernicus Sentinel data 2016–2017 were processed by ESA.
Format: Article in Journal/Newspaper
Language:English
Published: IGRAS 2020
Subjects:
Arctic;calving flux;glacier calving;ice cap;ice surface velocity;Severnaya Zemlya
айсберговый сток;Арктика;ледниковый купол;отёл ледников;поверхностная скорость движения ледника;Северная Земля
Arctic
Severnaya Zemlya
Annals of Glaciology
Antarctic and Alpine Research
Ice cap
Polar Research
Tidewater
Арктика
Online Access:https://ice-snow.igras.ru/jour/article/view/779
https://doi.org/10.31857/S2076673420010020
id ftjias:oai:oai.ice.elpub.ru:article/779
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institution Open Polar
collection Ice and Snow (E-Journal)
op_collection_id ftjias
language English
topic Arctic;calving flux;glacier calving;ice cap;ice surface velocity;Severnaya Zemlya
айсберговый сток;Арктика;ледниковый купол;отёл ледников;поверхностная скорость движения ледника;Северная Земля
spellingShingle Arctic;calving flux;glacier calving;ice cap;ice surface velocity;Severnaya Zemlya
айсберговый сток;Арктика;ледниковый купол;отёл ледников;поверхностная скорость движения ледника;Северная Земля
P. Sánchez-Gámez
F. Navarro J.
J. Dowdeswell A.
E. De Andrés
Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya
topic_facet Arctic;calving flux;glacier calving;ice cap;ice surface velocity;Severnaya Zemlya
айсберговый сток;Арктика;ледниковый купол;отёл ледников;поверхностная скорость движения ледника;Северная Земля
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. По 54 парам космических снимков Sentinel‐1, сделанных с ноября 2016 г. по ноябрь 2017 г., определены скорости движения ледникового купола Академии Наук на Северной Земле. На этой основе оценён среднегодовой расход льда в море этого купола (1,93±0,12 Гт/год), установлены основные пути стока льда, проведено сравнение с прежними оценками.
author2 This study has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 727890 and from Agencia Estatal de Investigación under grant CTM2017-84441-R of the Spanish Estate Plan for R & D. The radio-echo sounding campaign was funded by grants GR3/9958 and GST/02/2195 to JAD from the UK Natural Environment Research Council. Copernicus Sentinel data 2016–2017 were processed by ESA.
format Article in Journal/Newspaper
author P. Sánchez-Gámez
F. Navarro J.
J. Dowdeswell A.
E. De Andrés
author_facet P. Sánchez-Gámez
F. Navarro J.
J. Dowdeswell A.
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 IGRAS
publishDate 2020
url https://ice-snow.igras.ru/jour/article/view/779
https://doi.org/10.31857/S2076673420010020
long_lat ENVELOPE(98.000,98.000,79.500,79.500)
geographic Arctic
Severnaya Zemlya
geographic_facet Arctic
Severnaya Zemlya
genre Annals of Glaciology
Antarctic and Alpine Research
Arctic
Arctic
Ice cap
Polar Research
Severnaya Zemlya
Tidewater
Арктика
genre_facet Annals of Glaciology
Antarctic and Alpine Research
Arctic
Arctic
Ice cap
Polar Research
Severnaya Zemlya
Tidewater
Арктика
op_source Ice and Snow; Том 60, № 1 (2020); 19-28
Лёд и Снег; Том 60, № 1 (2020); 19-28
2412-3765
2076-6734
op_relation https://ice-snow.igras.ru/jour/article/view/779/498
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spelling ftjias:oai:oai.ice.elpub.ru:article/779 2023-05-15T13:29:52+02:00 Surface velocities and calving flux of the Academy of Sciences Ice Cap, Severnaya Zemlya Поверхностные скорости и айсберговый сток ледникового купола Академии Наук на Северной Земле P. Sánchez-Gámez F. Navarro J. J. Dowdeswell A. E. De Andrés This study has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 727890 and from Agencia Estatal de Investigación under grant CTM2017-84441-R of the Spanish Estate Plan for R & D. The radio-echo sounding campaign was funded by grants GR3/9958 and GST/02/2195 to JAD from the UK Natural Environment Research Council. Copernicus Sentinel data 2016–2017 were processed by ESA. 2020-04-04 application/pdf https://ice-snow.igras.ru/jour/article/view/779 https://doi.org/10.31857/S2076673420010020 eng eng IGRAS https://ice-snow.igras.ru/jour/article/view/779/498 Dowdeswell J., Bassford R., Gorman M., Williams M., Glazovsky A., Macheret Y., Shepherd A., Vasilenko Y., Savatyuguin L., Hubberten H., Miller H. Form and flow of the Academy of Sciences Ice Cap, Severnaya Zemlya, Russian High Arctic. Journ. of Geophys. Research. 2002, 107: 1–16. doi:10.1029/2000jb000129. Błaszczyk M., Jania J., Hagen J. Tidewater glaciers of Svalbard: recent changes and estimates of calving fluxes. Polish Polar Research. 2009, 30 (2): 85–142. Bolch T., Sandberg Sørensen L., Simonsen S.B., Mölg N., Machguth H., Rastner P., Paul F. Mass loss of Greenland’s glaciers and ice caps 2003–2008 revealed from ICESat laser altimetry data. Geophys. Research Letters. 2013, 40: 875–881. doi:10.1002/grl.50270. Burgess E., Forster R., Larsen C. Flow velocities of Alaskan glaciers. Nature Communications. 2013, 4: 2146. doi:10.1038/ncomms3146. McNabb R., Hock R., Huss M. Variations in Alaska tidewater glacier frontal ablation, 1985–2013. Journ. of Geophys. Research. 2015, 120 (1): 120–136. doi:10.1002/2014jf003276. Sánchez-Gámez P., Navarro F.J. Glacier Surface Velocity Retrieval Using D-InSAR and Offset Tracking Techniques Applied to Ascending and Descending Passes of Sentinel-1 Data for Southern Ellesmere Ice Caps, Canadian Arctic. Remote Sensing. 2017, 9 (5): 442. doi:10.3390/rs9050442. Sánchez-Gámez P., Navarro F.J. Ice discharge error estimates using different cross-sectional area approaches: a case study for the Canadian High Arctic, 2016/17. Journ. of Glaciology. 2018, 64 (246): 595–608. doi:10.1017/jog.2018.48. De Andrés E., Otero J., Navarro F., Promińska J., Lapazaran J., Walczowski W. 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CC-BY Ice and Snow; Том 60, № 1 (2020); 19-28 Лёд и Снег; Том 60, № 1 (2020); 19-28 2412-3765 2076-6734 Arctic;calving flux;glacier calving;ice cap;ice surface velocity;Severnaya Zemlya айсберговый сток;Арктика;ледниковый купол;отёл ледников;поверхностная скорость движения ледника;Северная Земля info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftjias https://doi.org/10.31857/S2076673420010020 https://doi.org/10.1029/2000jb000129 https://doi.org/10.1002/grl.50270 https://doi.org/10.1038/ncomms3146 https://doi.org/10.1002/2014jf003276 https://doi.org/10.3390/rs9050442 https://doi.org/10.1017 2022-12-20T13:30:01Z 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. По 54 парам космических снимков Sentinel‐1, сделанных с ноября 2016 г. по ноябрь 2017 г., определены скорости движения ледникового купола Академии Наук на Северной Земле. На этой основе оценён среднегодовой расход льда в море этого купола (1,93±0,12 Гт/год), установлены основные пути стока льда, проведено сравнение с прежними оценками. Article in Journal/Newspaper Annals of Glaciology Antarctic and Alpine Research Arctic Arctic Ice cap Polar Research Severnaya Zemlya Tidewater Арктика Ice and Snow (E-Journal) Arctic Severnaya Zemlya ENVELOPE(98.000,98.000,79.500,79.500) Espacio Tiempo y Forma. Serie VI, Geografía 0 10 179

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