Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier
The Helheim glacier in south-east Greenland faces a retreat and thinning like many other Greenland outlet glaciers, but showed two particular huge and fast retreats between 2000 and 2005, coinciding with an acceleration of glacier flow [1]. The estimation of glacier retreat and thinning are establis...
Main Authors: | , |
---|---|
Other Authors: | |
Format: | Conference Object |
Language: | English |
Published: |
ESA Communications
2015
|
Subjects: | |
Online Access: | https://elib.dlr.de/94715/ https://elib.dlr.de/94715/1/georg_fischer_polinsar2015_abstract_short.pdf |
id |
ftdlr:oai:elib.dlr.de:94715 |
---|---|
record_format |
openpolar |
spelling |
ftdlr:oai:elib.dlr.de:94715 2024-05-19T07:39:36+00:00 Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier Fischer, Georg Hajnsek, Irena Lacoste-Francis, H. 2015-01 application/pdf https://elib.dlr.de/94715/ https://elib.dlr.de/94715/1/georg_fischer_polinsar2015_abstract_short.pdf en eng ESA Communications https://elib.dlr.de/94715/1/georg_fischer_polinsar2015_abstract_short.pdf Fischer, Georg und Hajnsek, Irena (2015) Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier. In: Proceedings of ESA POLinSAR Workshop. ESA Communications. ESA POLinSAR Workshop, 2015-01-26 - 2015-01-30, Frascati, Italy. Radarkonzepte Konferenzbeitrag NonPeerReviewed 2015 ftdlr 2024-04-25T00:33:07Z The Helheim glacier in south-east Greenland faces a retreat and thinning like many other Greenland outlet glaciers, but showed two particular huge and fast retreats between 2000 and 2005, coinciding with an acceleration of glacier flow [1]. The estimation of glacier retreat and thinning are established procedures based on a variety of remote sensing techniques, e.g. SAR interferometry (InSAR) [1]. However, due to densification processes, e.g. refreezing of meltwater, changes in the mass balance cannot be calculated solely from changes in the volume of a glacier derived from interferometric elevation models [2]. A near surface densification related to refreezing of meltwater leads to a reduction in surface elevation, but does not contribute to a mass loss and thus cannot be attributed to a potential sea level rise. Likewise, the measurement of snow accumulation and its spatial distribution is error prone due to the penetration bias of InSAR measurements. While local data of accumulation or densification give precise information [2], satellite based polarimetric and interferometric SAR (Pol-InSAR) data has the potential to assess these changes in the near surface snow and firn layers with a better spatial and temporal coverage. This study investigates X-band (TanDEM-X) Pol-InSAR data in order to retrieve information about the temporal and spatial variations of surface and near- surface parameters of the Helheim glacier. [1] I.M. Howat, I. Joughin, S. Tulaczyk, and S. Gogineni, “Rapid retreat and acceleration of Helheim Glacier, east Greenland”, Geophysical Research Letters, vol. 32, 2005 [2] V. Parry, P. Nienow, D. Mair, J. Scott, B. Hubbard, K. Steffen and D. Wingham, “Investigations of meltwater refreezing and density variations in the snowpack and firn within the percolation zone of the Greenland ice sheet”, Annals of Glaciology, vol 46, no. A252, pp. 61-68, 2007 Conference Object East Greenland glacier Greenland Ice Sheet German Aerospace Center: elib - DLR electronic library |
institution |
Open Polar |
collection |
German Aerospace Center: elib - DLR electronic library |
op_collection_id |
ftdlr |
language |
English |
topic |
Radarkonzepte |
spellingShingle |
Radarkonzepte Fischer, Georg Hajnsek, Irena Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier |
topic_facet |
Radarkonzepte |
description |
The Helheim glacier in south-east Greenland faces a retreat and thinning like many other Greenland outlet glaciers, but showed two particular huge and fast retreats between 2000 and 2005, coinciding with an acceleration of glacier flow [1]. The estimation of glacier retreat and thinning are established procedures based on a variety of remote sensing techniques, e.g. SAR interferometry (InSAR) [1]. However, due to densification processes, e.g. refreezing of meltwater, changes in the mass balance cannot be calculated solely from changes in the volume of a glacier derived from interferometric elevation models [2]. A near surface densification related to refreezing of meltwater leads to a reduction in surface elevation, but does not contribute to a mass loss and thus cannot be attributed to a potential sea level rise. Likewise, the measurement of snow accumulation and its spatial distribution is error prone due to the penetration bias of InSAR measurements. While local data of accumulation or densification give precise information [2], satellite based polarimetric and interferometric SAR (Pol-InSAR) data has the potential to assess these changes in the near surface snow and firn layers with a better spatial and temporal coverage. This study investigates X-band (TanDEM-X) Pol-InSAR data in order to retrieve information about the temporal and spatial variations of surface and near- surface parameters of the Helheim glacier. [1] I.M. Howat, I. Joughin, S. Tulaczyk, and S. Gogineni, “Rapid retreat and acceleration of Helheim Glacier, east Greenland”, Geophysical Research Letters, vol. 32, 2005 [2] V. Parry, P. Nienow, D. Mair, J. Scott, B. Hubbard, K. Steffen and D. Wingham, “Investigations of meltwater refreezing and density variations in the snowpack and firn within the percolation zone of the Greenland ice sheet”, Annals of Glaciology, vol 46, no. A252, pp. 61-68, 2007 |
author2 |
Lacoste-Francis, H. |
format |
Conference Object |
author |
Fischer, Georg Hajnsek, Irena |
author_facet |
Fischer, Georg Hajnsek, Irena |
author_sort |
Fischer, Georg |
title |
Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier |
title_short |
Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier |
title_full |
Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier |
title_fullStr |
Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier |
title_full_unstemmed |
Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier |
title_sort |
dual-pol x-band pol-insar time series of a greenland outlet glacier |
publisher |
ESA Communications |
publishDate |
2015 |
url |
https://elib.dlr.de/94715/ https://elib.dlr.de/94715/1/georg_fischer_polinsar2015_abstract_short.pdf |
genre |
East Greenland glacier Greenland Ice Sheet |
genre_facet |
East Greenland glacier Greenland Ice Sheet |
op_relation |
https://elib.dlr.de/94715/1/georg_fischer_polinsar2015_abstract_short.pdf Fischer, Georg und Hajnsek, Irena (2015) Dual-Pol X-Band Pol-InSAR Time Series of a Greenland Outlet Glacier. In: Proceedings of ESA POLinSAR Workshop. ESA Communications. ESA POLinSAR Workshop, 2015-01-26 - 2015-01-30, Frascati, Italy. |
_version_ |
1799479174845431808 |