Grounding line migration from 1992 to 2011 on Petermann Glacier, North-West Greenland
We use satellite radar interferometry to investigate changes in the location of the Petermann Glacier grounding line between 1992 and 2011. The grounding line location was identified in 17 quadruple-difference interferograms produced from European Remote Sensing (ERS)-1/2 data – the most extensive t...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2016-12-01
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| Series: | Journal of Glaciology |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S0022143016000836/type/journal_article |
| _version_ | 1811155867360296960 |
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| author | ANNA E. HOGG ANDREW SHEPHERD NOEL GOURMELEN MARCUS ENGDAHL |
| author_facet | ANNA E. HOGG ANDREW SHEPHERD NOEL GOURMELEN MARCUS ENGDAHL |
| author_sort | ANNA E. HOGG |
| collection | DOAJ |
| description | We use satellite radar interferometry to investigate changes in the location of the Petermann Glacier grounding line between 1992 and 2011. The grounding line location was identified in 17 quadruple-difference interferograms produced from European Remote Sensing (ERS)-1/2 data – the most extensive time series assembled at any ice stream to date. There is close agreement (20.6 cm) between vertical displacement of the floating ice shelf and relative tide amplitudes simulated by the Arctic Ocean Dynamics-based Tide Model 5 (AODTM-5) Arctic tide model. Over the 19 a period, the groundling line position varied by 470 m, on average, with a maximum range of 7.0 km observed on the north-east margin of the ice stream. Although the mean range (2.8 km) and variability (320 m) of the grounding line position is considerably lower if the unusually variable north-east sector is not considered, our observations demonstrate that large, isolated movements cannot be precluded, thus sparse temporal records should be analysed with care. The grounding line migration observed on Petermann Glacier is not significantly correlated with time (R
2 = 0.22) despite reported ice shelf thinning and episodes of large iceberg calving, which suggests that unlike other ice streams, on the south-west margin of the Greenland ice sheet, Petermann Glacier is dynamically stable. |
| first_indexed | 2024-04-10T04:41:51Z |
| format | Article |
| id | doaj.art-7993cbde89eb48049cf6db429e2fd159 |
| institution | Directory Open Access Journal |
| issn | 0022-1430 1727-5652 |
| language | English |
| last_indexed | 2024-04-10T04:41:51Z |
| publishDate | 2016-12-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Journal of Glaciology |
| spelling | doaj.art-7993cbde89eb48049cf6db429e2fd1592023-03-09T12:40:20ZengCambridge University PressJournal of Glaciology0022-14301727-56522016-12-01621104111410.1017/jog.2016.83Grounding line migration from 1992 to 2011 on Petermann Glacier, North-West GreenlandANNA E. HOGG0ANDREW SHEPHERD1NOEL GOURMELEN2MARCUS ENGDAHL3Centre for Polar Observation and Modelling, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKCentre for Polar Observation and Modelling, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UKInstitute of Geography, School of GeoSciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UKDirectorate of Earth Observation Programmes, ESA-ESRIN, Via Galileo Galilei, 00044 Frascati, ItalyWe use satellite radar interferometry to investigate changes in the location of the Petermann Glacier grounding line between 1992 and 2011. The grounding line location was identified in 17 quadruple-difference interferograms produced from European Remote Sensing (ERS)-1/2 data – the most extensive time series assembled at any ice stream to date. There is close agreement (20.6 cm) between vertical displacement of the floating ice shelf and relative tide amplitudes simulated by the Arctic Ocean Dynamics-based Tide Model 5 (AODTM-5) Arctic tide model. Over the 19 a period, the groundling line position varied by 470 m, on average, with a maximum range of 7.0 km observed on the north-east margin of the ice stream. Although the mean range (2.8 km) and variability (320 m) of the grounding line position is considerably lower if the unusually variable north-east sector is not considered, our observations demonstrate that large, isolated movements cannot be precluded, thus sparse temporal records should be analysed with care. The grounding line migration observed on Petermann Glacier is not significantly correlated with time (R 2 = 0.22) despite reported ice shelf thinning and episodes of large iceberg calving, which suggests that unlike other ice streams, on the south-west margin of the Greenland ice sheet, Petermann Glacier is dynamically stable.https://www.cambridge.org/core/product/identifier/S0022143016000836/type/journal_articleERSgrounding lineInSARinterferometry |
| spellingShingle | ANNA E. HOGG ANDREW SHEPHERD NOEL GOURMELEN MARCUS ENGDAHL Grounding line migration from 1992 to 2011 on Petermann Glacier, North-West Greenland Journal of Glaciology ERS grounding line InSAR interferometry |
| title | Grounding line migration from 1992 to 2011 on Petermann Glacier, North-West Greenland |
| title_full | Grounding line migration from 1992 to 2011 on Petermann Glacier, North-West Greenland |
| title_fullStr | Grounding line migration from 1992 to 2011 on Petermann Glacier, North-West Greenland |
| title_full_unstemmed | Grounding line migration from 1992 to 2011 on Petermann Glacier, North-West Greenland |
| title_short | Grounding line migration from 1992 to 2011 on Petermann Glacier, North-West Greenland |
| title_sort | grounding line migration from 1992 to 2011 on petermann glacier north west greenland |
| topic | ERS grounding line InSAR interferometry |
| url | https://www.cambridge.org/core/product/identifier/S0022143016000836/type/journal_article |
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