Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica)
Surface velocities of grounded ice are an important input parameter for mass flux calculations and ice-sheet modelling. As on-site measurements in remote areas are sparse, satellite-based measurements have to be used to obtain area-wide surface velocities. For this purpose synthetic aperture radar d...
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ftawi:oai:epic.awi.de:22553 2024-09-09T19:12:01+00:00 Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) Neckel, Niklas Drews, Reinhard Eisen, Olaf Rack, Wolfgang Steinhage, Daniel 2010 application/pdf https://epic.awi.de/id/eprint/22553/ https://epic.awi.de/id/eprint/22553/1/Nec2010a.pdf https://hdl.handle.net/10013/epic.35225 https://hdl.handle.net/10013/epic.35225.d001 unknown https://epic.awi.de/id/eprint/22553/1/Nec2010a.pdf https://hdl.handle.net/10013/epic.35225.d001 Neckel, N. orcid:0000-0003-4300-5488 , Drews, R. , Eisen, O. orcid:0000-0002-6380-962X , Rack, W. and Steinhage, D. orcid:0000-0003-4737-9751 (2010) Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) , 24. Internationale Polartagung der Deutschen Gesellschaft für Polarforschung. . hdl:10013/epic.35225 EPIC324. Internationale Polartagung der Deutschen Gesellschaft für Polarforschung. Conference notRev 2010 ftawi 2024-06-24T04:02:26Z Surface velocities of grounded ice are an important input parameter for mass flux calculations and ice-sheet modelling. As on-site measurements in remote areas are sparse, satellite-based measurements have to be used to obtain area-wide surface velocities. For this purpose synthetic aperture radar data from various sensors are routinely employed. Depending on the availability of adequate SAR image pairs, the surface velocity is derived by radar interferometry, speckle or feature tracking. The accuracy of the applied methods heavily depends on external input parameters (e.g. elevation model) and the processing history. In this case study we aim to put error margins on the evaluated surface velocities by comparing the data with available on-site GPS measurement. The study focuses on the hinterland of the German overwintering station Neumayer III (Antarctica) and complements pre-site surveys for a future deep drill site. We analyse the dependency of external elevation models for the interferometric approach by comparing surface velocities based on Antarctic-wide elevation models (from satellite altimetry and photoclinometry), with surface velocities based on local elevation models (from differential SAR interferometry). The interferometric approach is restricted to the availability of coherent SAR image pairs and does not cover the floating ice shelves. We fill these gaps with data from lower-resolved speckle and feature tracking.The main goal is to point out the inaccuracy/accuracy of surface velocity fields. As a geophysical product a map of surface velocities next to the German overwintering station Neumayer III is presented. In combination with ice-thickness measurements in the area the mass flux and its uncertainties are estimated. In the future we aim to use these velocities for the derivation of stress and strain rates in complex flow regimes, such as triple points on the nearby ice domes. These areas are of particular interest for ice coring, ice sheet modelling, radio-echo sounding and seismic studies. Conference Object Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Polarforschung Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Neumayer |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Surface velocities of grounded ice are an important input parameter for mass flux calculations and ice-sheet modelling. As on-site measurements in remote areas are sparse, satellite-based measurements have to be used to obtain area-wide surface velocities. For this purpose synthetic aperture radar data from various sensors are routinely employed. Depending on the availability of adequate SAR image pairs, the surface velocity is derived by radar interferometry, speckle or feature tracking. The accuracy of the applied methods heavily depends on external input parameters (e.g. elevation model) and the processing history. In this case study we aim to put error margins on the evaluated surface velocities by comparing the data with available on-site GPS measurement. The study focuses on the hinterland of the German overwintering station Neumayer III (Antarctica) and complements pre-site surveys for a future deep drill site. We analyse the dependency of external elevation models for the interferometric approach by comparing surface velocities based on Antarctic-wide elevation models (from satellite altimetry and photoclinometry), with surface velocities based on local elevation models (from differential SAR interferometry). The interferometric approach is restricted to the availability of coherent SAR image pairs and does not cover the floating ice shelves. We fill these gaps with data from lower-resolved speckle and feature tracking.The main goal is to point out the inaccuracy/accuracy of surface velocity fields. As a geophysical product a map of surface velocities next to the German overwintering station Neumayer III is presented. In combination with ice-thickness measurements in the area the mass flux and its uncertainties are estimated. In the future we aim to use these velocities for the derivation of stress and strain rates in complex flow regimes, such as triple points on the nearby ice domes. These areas are of particular interest for ice coring, ice sheet modelling, radio-echo sounding and seismic studies. |
format |
Conference Object |
author |
Neckel, Niklas Drews, Reinhard Eisen, Olaf Rack, Wolfgang Steinhage, Daniel |
spellingShingle |
Neckel, Niklas Drews, Reinhard Eisen, Olaf Rack, Wolfgang Steinhage, Daniel Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) |
author_facet |
Neckel, Niklas Drews, Reinhard Eisen, Olaf Rack, Wolfgang Steinhage, Daniel |
author_sort |
Neckel, Niklas |
title |
Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) |
title_short |
Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) |
title_full |
Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) |
title_fullStr |
Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) |
title_full_unstemmed |
Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) |
title_sort |
surface velocities and mass flux in the vicinity and hinterland of the neumayer iii station (antarctica) |
publishDate |
2010 |
url |
https://epic.awi.de/id/eprint/22553/ https://epic.awi.de/id/eprint/22553/1/Nec2010a.pdf https://hdl.handle.net/10013/epic.35225 https://hdl.handle.net/10013/epic.35225.d001 |
geographic |
Antarctic Neumayer |
geographic_facet |
Antarctic Neumayer |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Polarforschung |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Polarforschung |
op_source |
EPIC324. Internationale Polartagung der Deutschen Gesellschaft für Polarforschung. |
op_relation |
https://epic.awi.de/id/eprint/22553/1/Nec2010a.pdf https://hdl.handle.net/10013/epic.35225.d001 Neckel, N. orcid:0000-0003-4300-5488 , Drews, R. , Eisen, O. orcid:0000-0002-6380-962X , Rack, W. and Steinhage, D. orcid:0000-0003-4737-9751 (2010) Surface velocities and mass flux in the vicinity and hinterland of the Neumayer III station (Antarctica) , 24. Internationale Polartagung der Deutschen Gesellschaft für Polarforschung. . hdl:10013/epic.35225 |
_version_ |
1809752452677763072 |