Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica
This dataset describes ice thickness, surface elevation and bed elevation of a small pinning point located at the ice-shelf front of the Roi Baudouin Ice Shelf, Dronning Maud Land, Antarctica. The scientific context is as follows: Antarctic ice shelves are buttressed by numerous pinning points attac...
Main Author: | |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2019
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.905997 https://doi.org/10.1594/PANGAEA.905997 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.905997 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.905997 2024-09-15T17:48:17+00:00 Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica Drews, Reinhard LATITUDE: -71.200000 * LONGITUDE: 29.800000 2019 text/tab-separated-values, 1060 data points https://doi.pangaea.de/10.1594/PANGAEA.905997 https://doi.org/10.1594/PANGAEA.905997 en eng PANGAEA Pinning Point QUICKSHOT (URI: https://store.pangaea.de/Publications/Drews_2019/RDrews_PinningPoint_QUICKSHOT.png) Drews, Reinhard; Matsuoka, Kenichi; Martín, Carlos; Callens, Denis; Bergeot, N; Pattyn, Frank (2015): Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia. Journal of Geophysical Research-Earth Surface, 120(3), 564-579, https://doi.org/10.1002/2014JF003246 https://doi.pangaea.de/10.1594/PANGAEA.905997 https://doi.org/10.1594/PANGAEA.905997 CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Berger, Sophie; Favier, Lionel; Drews, Reinhard; Derwael, Jean-Jacques; Pattyn, Frank (2016): The control of an uncharted pinning point on the flow of an Antarctic ice shelf. Journal of Glaciology, 62(231), 37-45, https://doi.org/10.1017/jog.2016.7 Bed elevation Differential kinematic GPS with dual phase receivers Ice thickness Pinning Points Polar stereographic projection X Y Roi_Baudoin_ice_shelf SAT Satellite remote sensing Surface elevation dataset 2019 ftpangaea https://doi.org/10.1594/PANGAEA.90599710.1017/jog.2016.710.1002/2014JF003246 2024-08-27T23:49:29Z This dataset describes ice thickness, surface elevation and bed elevation of a small pinning point located at the ice-shelf front of the Roi Baudouin Ice Shelf, Dronning Maud Land, Antarctica. The scientific context is as follows: Antarctic ice shelves are buttressed by numerous pinning points attaching to the otherwise freely-floating ice from below. Some of these kilometric-scale grounded features are unresolved in Antarctic-wide datasets of ice thickness and bathymetry, hampering ice flow models to fully capture dynamics at the grounding line and upstream. We investigate the role of an 8.7 km2 pinning point at the front of the Roi Baudouin Ice Shelf, East Antarctica. Using ERS interferometry and ALOS-PALSAR speckle tracking, we derive, on a 125 m grid spacing, surface velocities deviating by −5.2 ± 4.5 m a−1 from 37 on-site global navigation satellite systems-derived velocities. We find no evidence for ice flow changes on decadal time scales and we show that ice on the pinning point virtually stagnates, deviating the ice stream and causing enhanced horizontal shearing upstream. Using the BISICLES ice-flow model, we invert for basal friction and ice rigidity with three input scenarios of ice velocity and geometry. We show that inversion results are the most sensitive to the presence/absence of the pinning point in the bathymetry; surface velocities at the pinning point are of secondary importance. Undersampling of pinning points results in erroneous ice-shelf properties in models initialised by control methods. This may impact prognostic modelling for ice-sheet evolution in the case of unpinning. Dataset Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(29.800000,29.800000,-71.200000,-71.200000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Bed elevation Differential kinematic GPS with dual phase receivers Ice thickness Pinning Points Polar stereographic projection X Y Roi_Baudoin_ice_shelf SAT Satellite remote sensing Surface elevation |
spellingShingle |
Bed elevation Differential kinematic GPS with dual phase receivers Ice thickness Pinning Points Polar stereographic projection X Y Roi_Baudoin_ice_shelf SAT Satellite remote sensing Surface elevation Drews, Reinhard Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica |
topic_facet |
Bed elevation Differential kinematic GPS with dual phase receivers Ice thickness Pinning Points Polar stereographic projection X Y Roi_Baudoin_ice_shelf SAT Satellite remote sensing Surface elevation |
description |
This dataset describes ice thickness, surface elevation and bed elevation of a small pinning point located at the ice-shelf front of the Roi Baudouin Ice Shelf, Dronning Maud Land, Antarctica. The scientific context is as follows: Antarctic ice shelves are buttressed by numerous pinning points attaching to the otherwise freely-floating ice from below. Some of these kilometric-scale grounded features are unresolved in Antarctic-wide datasets of ice thickness and bathymetry, hampering ice flow models to fully capture dynamics at the grounding line and upstream. We investigate the role of an 8.7 km2 pinning point at the front of the Roi Baudouin Ice Shelf, East Antarctica. Using ERS interferometry and ALOS-PALSAR speckle tracking, we derive, on a 125 m grid spacing, surface velocities deviating by −5.2 ± 4.5 m a−1 from 37 on-site global navigation satellite systems-derived velocities. We find no evidence for ice flow changes on decadal time scales and we show that ice on the pinning point virtually stagnates, deviating the ice stream and causing enhanced horizontal shearing upstream. Using the BISICLES ice-flow model, we invert for basal friction and ice rigidity with three input scenarios of ice velocity and geometry. We show that inversion results are the most sensitive to the presence/absence of the pinning point in the bathymetry; surface velocities at the pinning point are of secondary importance. Undersampling of pinning points results in erroneous ice-shelf properties in models initialised by control methods. This may impact prognostic modelling for ice-sheet evolution in the case of unpinning. |
format |
Dataset |
author |
Drews, Reinhard |
author_facet |
Drews, Reinhard |
author_sort |
Drews, Reinhard |
title |
Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica |
title_short |
Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica |
title_full |
Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica |
title_fullStr |
Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica |
title_full_unstemmed |
Ice thickness, surface-, and bed elevation of a pinning point in Roi Baudouin Ice Shelf, Dronning Maud Land Antarctica |
title_sort |
ice thickness, surface-, and bed elevation of a pinning point in roi baudouin ice shelf, dronning maud land antarctica |
publisher |
PANGAEA |
publishDate |
2019 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.905997 https://doi.org/10.1594/PANGAEA.905997 |
op_coverage |
LATITUDE: -71.200000 * LONGITUDE: 29.800000 |
long_lat |
ENVELOPE(29.800000,29.800000,-71.200000,-71.200000) |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Ice Sheet Ice Shelf Ice Shelves Journal of Glaciology |
op_source |
Supplement to: Berger, Sophie; Favier, Lionel; Drews, Reinhard; Derwael, Jean-Jacques; Pattyn, Frank (2016): The control of an uncharted pinning point on the flow of an Antarctic ice shelf. Journal of Glaciology, 62(231), 37-45, https://doi.org/10.1017/jog.2016.7 |
op_relation |
Pinning Point QUICKSHOT (URI: https://store.pangaea.de/Publications/Drews_2019/RDrews_PinningPoint_QUICKSHOT.png) Drews, Reinhard; Matsuoka, Kenichi; Martín, Carlos; Callens, Denis; Bergeot, N; Pattyn, Frank (2015): Evolution of Derwael Ice Rise in Dronning Maud Land, Antarctica, over the last millennia. Journal of Geophysical Research-Earth Surface, 120(3), 564-579, https://doi.org/10.1002/2014JF003246 https://doi.pangaea.de/10.1594/PANGAEA.905997 https://doi.org/10.1594/PANGAEA.905997 |
op_rights |
CC-BY-4.0: Creative Commons Attribution 4.0 International Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.90599710.1017/jog.2016.710.1002/2014JF003246 |
_version_ |
1810289437693706240 |