Sea Tide Influence on Ice Flow of David Drygalski’s Ice Tongue Inferred from Geodetic GNSS Observations and SAR Offset Tracking Analysis
David Glacier and Drygalski Ice Tongue are massive glaciers in Victoria Land, Antarctica. The ice from the East Antarctic Ice Sheet is drained through the former, and then discharged into the western Ross Sea through the latter. David Drygalski is the largest outlet glacier in Northern Victoria Land...
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ftmdpi:oai:mdpi.com:/2072-4292/15/8/2037/ 2023-08-20T04:01:05+02:00 Sea Tide Influence on Ice Flow of David Drygalski’s Ice Tongue Inferred from Geodetic GNSS Observations and SAR Offset Tracking Analysis Luca Vittuari Antonio Zanutta Andrea Lugli Leonardo Martelli Marco Dubbini agris 2023-04-12 application/pdf https://doi.org/10.3390/rs15082037 EN eng Multidisciplinary Digital Publishing Institute Remote Sensing Image Processing https://dx.doi.org/10.3390/rs15082037 https://creativecommons.org/licenses/by/4.0/ Remote Sensing; Volume 15; Issue 8; Pages: 2037 Antarctic glaciology kinematic precise point positioning GNSS time series ice dynamics synthetic aperture radar COSMO-SkyMed Text 2023 ftmdpi https://doi.org/10.3390/rs15082037 2023-08-01T09:39:49Z David Glacier and Drygalski Ice Tongue are massive glaciers in Victoria Land, Antarctica. The ice from the East Antarctic Ice Sheet is drained through the former, and then discharged into the western Ross Sea through the latter. David Drygalski is the largest outlet glacier in Northern Victoria Land, floating kilometers out to sea. The floating and grounded part of the David Glacier are the main focus of this article. During the XXI Italian Antarctic Expedition (2005–2006), within the framework of the National Antarctic Research Programme (PNRA), two GNSS stations were installed at different points: the first close to the grounding line of David Glacier, and the second approximately 40 km downstream of the first one. Simultaneous data logging was performed by both GNSS stations for 24 days. In the latest data processing, the kinematic PPP technique was adopted to evaluate the dominant diurnal components and the very small semi-diurnal variations in ice motion induced by the ocean tide and the mean ice flow rates of both GNSS stations. Comparison of the GNSS time series with predicted ocean tide calculated from harmonic coefficients of the nearest tide gauge stations, installed at Cape Roberts and Mario Zucchelli Station, highlight different local response of the glacier to ocean tide, with a minor amplitude of vertical motion at a point partially anchored at the bedrock close to the grounding line. During low tide, the velocity of the ice flow reaches its daily maximum, in accordance with the direction of seawater outflow from the fjord into the ocean, while the greatest daily tidal excursion generates an increase in the horizontal ice flow velocity. With the aim to extend the analysis in spatial terms, five COSMO-SkyMED Stripmap scenes were processed. The comparison of the co-registered offset tracking rates, obtained from SAR images, with the GNSS estimation shows good agreement. Text Antarc* Antarctic Antarctica David Glacier Ice Sheet Ross Sea Victoria Land MDPI Open Access Publishing Antarctic Ross Sea Victoria Land East Antarctic Ice Sheet Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) Drygalski ENVELOPE(-61.000,-61.000,-64.717,-64.717) Mario Zucchelli ENVELOPE(164.123,164.123,-74.695,-74.695) Mario Zucchelli Station ENVELOPE(164.117,164.117,-74.700,-74.700) Drygalski Ice Tongue ENVELOPE(163.500,163.500,-75.400,-75.400) David Glacier ENVELOPE(160.000,160.000,-75.333,-75.333) Remote Sensing 15 8 2037 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
Antarctic glaciology kinematic precise point positioning GNSS time series ice dynamics synthetic aperture radar COSMO-SkyMed |
spellingShingle |
Antarctic glaciology kinematic precise point positioning GNSS time series ice dynamics synthetic aperture radar COSMO-SkyMed Luca Vittuari Antonio Zanutta Andrea Lugli Leonardo Martelli Marco Dubbini Sea Tide Influence on Ice Flow of David Drygalski’s Ice Tongue Inferred from Geodetic GNSS Observations and SAR Offset Tracking Analysis |
topic_facet |
Antarctic glaciology kinematic precise point positioning GNSS time series ice dynamics synthetic aperture radar COSMO-SkyMed |
description |
David Glacier and Drygalski Ice Tongue are massive glaciers in Victoria Land, Antarctica. The ice from the East Antarctic Ice Sheet is drained through the former, and then discharged into the western Ross Sea through the latter. David Drygalski is the largest outlet glacier in Northern Victoria Land, floating kilometers out to sea. The floating and grounded part of the David Glacier are the main focus of this article. During the XXI Italian Antarctic Expedition (2005–2006), within the framework of the National Antarctic Research Programme (PNRA), two GNSS stations were installed at different points: the first close to the grounding line of David Glacier, and the second approximately 40 km downstream of the first one. Simultaneous data logging was performed by both GNSS stations for 24 days. In the latest data processing, the kinematic PPP technique was adopted to evaluate the dominant diurnal components and the very small semi-diurnal variations in ice motion induced by the ocean tide and the mean ice flow rates of both GNSS stations. Comparison of the GNSS time series with predicted ocean tide calculated from harmonic coefficients of the nearest tide gauge stations, installed at Cape Roberts and Mario Zucchelli Station, highlight different local response of the glacier to ocean tide, with a minor amplitude of vertical motion at a point partially anchored at the bedrock close to the grounding line. During low tide, the velocity of the ice flow reaches its daily maximum, in accordance with the direction of seawater outflow from the fjord into the ocean, while the greatest daily tidal excursion generates an increase in the horizontal ice flow velocity. With the aim to extend the analysis in spatial terms, five COSMO-SkyMED Stripmap scenes were processed. The comparison of the co-registered offset tracking rates, obtained from SAR images, with the GNSS estimation shows good agreement. |
format |
Text |
author |
Luca Vittuari Antonio Zanutta Andrea Lugli Leonardo Martelli Marco Dubbini |
author_facet |
Luca Vittuari Antonio Zanutta Andrea Lugli Leonardo Martelli Marco Dubbini |
author_sort |
Luca Vittuari |
title |
Sea Tide Influence on Ice Flow of David Drygalski’s Ice Tongue Inferred from Geodetic GNSS Observations and SAR Offset Tracking Analysis |
title_short |
Sea Tide Influence on Ice Flow of David Drygalski’s Ice Tongue Inferred from Geodetic GNSS Observations and SAR Offset Tracking Analysis |
title_full |
Sea Tide Influence on Ice Flow of David Drygalski’s Ice Tongue Inferred from Geodetic GNSS Observations and SAR Offset Tracking Analysis |
title_fullStr |
Sea Tide Influence on Ice Flow of David Drygalski’s Ice Tongue Inferred from Geodetic GNSS Observations and SAR Offset Tracking Analysis |
title_full_unstemmed |
Sea Tide Influence on Ice Flow of David Drygalski’s Ice Tongue Inferred from Geodetic GNSS Observations and SAR Offset Tracking Analysis |
title_sort |
sea tide influence on ice flow of david drygalski’s ice tongue inferred from geodetic gnss observations and sar offset tracking analysis |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2023 |
url |
https://doi.org/10.3390/rs15082037 |
op_coverage |
agris |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) ENVELOPE(-61.000,-61.000,-64.717,-64.717) ENVELOPE(164.123,164.123,-74.695,-74.695) ENVELOPE(164.117,164.117,-74.700,-74.700) ENVELOPE(163.500,163.500,-75.400,-75.400) ENVELOPE(160.000,160.000,-75.333,-75.333) |
geographic |
Antarctic Ross Sea Victoria Land East Antarctic Ice Sheet Cape Roberts Drygalski Mario Zucchelli Mario Zucchelli Station Drygalski Ice Tongue David Glacier |
geographic_facet |
Antarctic Ross Sea Victoria Land East Antarctic Ice Sheet Cape Roberts Drygalski Mario Zucchelli Mario Zucchelli Station Drygalski Ice Tongue David Glacier |
genre |
Antarc* Antarctic Antarctica David Glacier Ice Sheet Ross Sea Victoria Land |
genre_facet |
Antarc* Antarctic Antarctica David Glacier Ice Sheet Ross Sea Victoria Land |
op_source |
Remote Sensing; Volume 15; Issue 8; Pages: 2037 |
op_relation |
Remote Sensing Image Processing https://dx.doi.org/10.3390/rs15082037 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/rs15082037 |
container_title |
Remote Sensing |
container_volume |
15 |
container_issue |
8 |
container_start_page |
2037 |
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1774722498462482432 |