The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations
Extensive observations on Nivlisen, an ice shelf at Antarctica's Atlantic coast, are analysed and combined to achieve a new-quality description of its complex glaciological regime. We generate models of ice thickness (primarily from ground-penetratingradar), ellipsoidal ice surface height (prim...
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ftawi:oai:epic.awi.de:10564 2023-09-05T13:14:04+02:00 The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations Horwath, M. Dietrich, R. Baessler, M. Nixdorf, Uwe Steinhage, Daniel Fritzsche, Diedrich Damm, V. Reitmayr, G. 2006 application/pdf https://epic.awi.de/id/eprint/10564/ https://epic.awi.de/id/eprint/10564/1/Wie2005a.pdf https://hdl.handle.net/10013/epic.21041 https://hdl.handle.net/10013/epic.21041.d001 unknown https://epic.awi.de/id/eprint/10564/1/Wie2005a.pdf https://hdl.handle.net/10013/epic.21041.d001 Horwath, M. , Dietrich, R. , Baessler, M. , Nixdorf, U. , Steinhage, D. orcid:0000-0003-4737-9751 , Fritzsche, D. orcid:0000-0002-0018-8993 , Damm, V. and Reitmayr, G. (2006) The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations , Journal of Glaciology, 52 (176), pp. 17-30 . hdl:10013/epic.21041 EPIC3Journal of Glaciology, 52(176), pp. 17-30 Article isiRev 2006 ftawi 2023-08-22T19:48:47Z Extensive observations on Nivlisen, an ice shelf at Antarctica's Atlantic coast, are analysed and combined to achieve a new-quality description of its complex glaciological regime. We generate models of ice thickness (primarily from ground-penetratingradar), ellipsoidal ice surface height (primarily from ERS-1 satellite altimetry), freeboard height (by utilising precise sea surface information), and ice flow velocity(from ERS-1/2 SAR interferometry and GPS measurements). Accuracy assessmentsare included. Exploiting the hydrostatic equilibrium relation we infer the 'apparent air layer thickness' as a useful measure for a glacier's density deviation from a pure ice body. This parameter exhibits a distinct spatial variation (ranging from 2 m to 16 m) which we attribute to the transition from an ablation areato an accumulation area. We compute mass flux and mass balance parameters on a local and areally integrated scale. The combined effect of bottom mass balance and temporal change averaged over an essential part of Nivlisen is -654±170 kgm2a-1 which suggests bottom melting processes to dominate. We discuss our results in view of temporal ice mass changes (including remarks on historical observations),basal processes, near-surface processes, and ice-flow dynamical features. The questionfor temporal changes remains open from the data at hand, and we recommendfurther observations and analyses for its solution. Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land Ice Shelf Journal of Glaciology Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Dronning Maud Land Nivlisen ENVELOPE(11.000,11.000,-70.333,-70.333) |
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 |
Extensive observations on Nivlisen, an ice shelf at Antarctica's Atlantic coast, are analysed and combined to achieve a new-quality description of its complex glaciological regime. We generate models of ice thickness (primarily from ground-penetratingradar), ellipsoidal ice surface height (primarily from ERS-1 satellite altimetry), freeboard height (by utilising precise sea surface information), and ice flow velocity(from ERS-1/2 SAR interferometry and GPS measurements). Accuracy assessmentsare included. Exploiting the hydrostatic equilibrium relation we infer the 'apparent air layer thickness' as a useful measure for a glacier's density deviation from a pure ice body. This parameter exhibits a distinct spatial variation (ranging from 2 m to 16 m) which we attribute to the transition from an ablation areato an accumulation area. We compute mass flux and mass balance parameters on a local and areally integrated scale. The combined effect of bottom mass balance and temporal change averaged over an essential part of Nivlisen is -654±170 kgm2a-1 which suggests bottom melting processes to dominate. We discuss our results in view of temporal ice mass changes (including remarks on historical observations),basal processes, near-surface processes, and ice-flow dynamical features. The questionfor temporal changes remains open from the data at hand, and we recommendfurther observations and analyses for its solution. |
format |
Article in Journal/Newspaper |
author |
Horwath, M. Dietrich, R. Baessler, M. Nixdorf, Uwe Steinhage, Daniel Fritzsche, Diedrich Damm, V. Reitmayr, G. |
spellingShingle |
Horwath, M. Dietrich, R. Baessler, M. Nixdorf, Uwe Steinhage, Daniel Fritzsche, Diedrich Damm, V. Reitmayr, G. The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations |
author_facet |
Horwath, M. Dietrich, R. Baessler, M. Nixdorf, Uwe Steinhage, Daniel Fritzsche, Diedrich Damm, V. Reitmayr, G. |
author_sort |
Horwath, M. |
title |
The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations |
title_short |
The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations |
title_full |
The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations |
title_fullStr |
The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations |
title_full_unstemmed |
The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations |
title_sort |
nivlisen, an antarctic ice shelf in dronning maud land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations |
publishDate |
2006 |
url |
https://epic.awi.de/id/eprint/10564/ https://epic.awi.de/id/eprint/10564/1/Wie2005a.pdf https://hdl.handle.net/10013/epic.21041 https://hdl.handle.net/10013/epic.21041.d001 |
long_lat |
ENVELOPE(11.000,11.000,-70.333,-70.333) |
geographic |
Antarctic Dronning Maud Land Nivlisen |
geographic_facet |
Antarctic Dronning Maud Land Nivlisen |
genre |
Antarc* Antarctic Dronning Maud Land Ice Shelf Journal of Glaciology |
genre_facet |
Antarc* Antarctic Dronning Maud Land Ice Shelf Journal of Glaciology |
op_source |
EPIC3Journal of Glaciology, 52(176), pp. 17-30 |
op_relation |
https://epic.awi.de/id/eprint/10564/1/Wie2005a.pdf https://hdl.handle.net/10013/epic.21041.d001 Horwath, M. , Dietrich, R. , Baessler, M. , Nixdorf, U. , Steinhage, D. orcid:0000-0003-4737-9751 , Fritzsche, D. orcid:0000-0002-0018-8993 , Damm, V. and Reitmayr, G. (2006) The Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic-glaciological results from a combined analysis of ice thickness, ice surface height and ice flow observations , Journal of Glaciology, 52 (176), pp. 17-30 . hdl:10013/epic.21041 |
_version_ |
1776205124638605312 |