Antarctic ice shelf thickness change from multimission lidar mapping
We calculate rates of ice thickness change and bottom melt for ice shelves in West Antarctica and the Antarctic Peninsula from a combination of elevation measurements from NASA–CECS Antarctic ice mapping campaigns and NASA Operation IceBridge corrected for oceanic processes from measurements and mod...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/383756 2023-12-03T10:11:47+01:00 Antarctic ice shelf thickness change from multimission lidar mapping Sutterley, Tyler C. Markus, Thorsten Neumann, Thomas A. van den Broeke, Michiel van Wessem, J. Melchior Ligtenberg, Stefan R. M. Sub Dynamics Meteorology Marine and Atmospheric Research 2019-07-08 image/pdf https://dspace.library.uu.nl/handle/1874/383756 en eng 1994-0416 https://dspace.library.uu.nl/handle/1874/383756 info:eu-repo/semantics/OpenAccess Article 2019 ftunivutrecht 2023-11-08T23:15:02Z We calculate rates of ice thickness change and bottom melt for ice shelves in West Antarctica and the Antarctic Peninsula from a combination of elevation measurements from NASA–CECS Antarctic ice mapping campaigns and NASA Operation IceBridge corrected for oceanic processes from measurements and models, surface velocity measurements from synthetic aperture radar, and high-resolution outputs from regional climate models. The ice thickness change rates are calculated in a Lagrangian reference frame to reduce the effects from advection of sharp vertical features, such as cracks and crevasses, that can saturate Eulerian-derived estimates. We use our method over different ice shelves in Antarctica, which vary in terms of size, repeat coverage from airborne altimetry, and dominant processes governing their recent changes. We find that the Larsen-C Ice Shelf is close to steady state over our observation period with spatial variations in ice thickness largely due to the flux divergence of the shelf. Firn and surface processes are responsible for some short-term variability in ice thickness of the Larsen-C Ice Shelf over the time period. The Wilkins Ice Shelf is sensitive to short-timescale coastal and upper-ocean processes, and basal melt is the dominant contributor to the ice thickness change over the period. At the Pine Island Ice Shelf in the critical region near the grounding zone, we find that ice shelf thickness change rates exceed 40 m yr−1, with the change dominated by strong submarine melting. Regions near the grounding zones of the Dotson and Crosson ice shelves are decreasing in thickness at rates greater than 40 m yr−1, also due to intense basal melt. NASA–CECS Antarctic ice mapping and NASA Operation IceBridge campaigns provide validation datasets for floating ice shelves at moderately high resolution when coregistered using Lagrangian methods. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ice Shelves Pine Island West Antarctica Wilkins Ice Shelf Utrecht University Repository Antarctic The Antarctic Antarctic Peninsula West Antarctica Wilkins ENVELOPE(59.326,59.326,-67.248,-67.248) Wilkins Ice Shelf ENVELOPE(-72.500,-72.500,-70.416,-70.416) |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
description |
We calculate rates of ice thickness change and bottom melt for ice shelves in West Antarctica and the Antarctic Peninsula from a combination of elevation measurements from NASA–CECS Antarctic ice mapping campaigns and NASA Operation IceBridge corrected for oceanic processes from measurements and models, surface velocity measurements from synthetic aperture radar, and high-resolution outputs from regional climate models. The ice thickness change rates are calculated in a Lagrangian reference frame to reduce the effects from advection of sharp vertical features, such as cracks and crevasses, that can saturate Eulerian-derived estimates. We use our method over different ice shelves in Antarctica, which vary in terms of size, repeat coverage from airborne altimetry, and dominant processes governing their recent changes. We find that the Larsen-C Ice Shelf is close to steady state over our observation period with spatial variations in ice thickness largely due to the flux divergence of the shelf. Firn and surface processes are responsible for some short-term variability in ice thickness of the Larsen-C Ice Shelf over the time period. The Wilkins Ice Shelf is sensitive to short-timescale coastal and upper-ocean processes, and basal melt is the dominant contributor to the ice thickness change over the period. At the Pine Island Ice Shelf in the critical region near the grounding zone, we find that ice shelf thickness change rates exceed 40 m yr−1, with the change dominated by strong submarine melting. Regions near the grounding zones of the Dotson and Crosson ice shelves are decreasing in thickness at rates greater than 40 m yr−1, also due to intense basal melt. NASA–CECS Antarctic ice mapping and NASA Operation IceBridge campaigns provide validation datasets for floating ice shelves at moderately high resolution when coregistered using Lagrangian methods. |
author2 |
Sub Dynamics Meteorology Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Sutterley, Tyler C. Markus, Thorsten Neumann, Thomas A. van den Broeke, Michiel van Wessem, J. Melchior Ligtenberg, Stefan R. M. |
spellingShingle |
Sutterley, Tyler C. Markus, Thorsten Neumann, Thomas A. van den Broeke, Michiel van Wessem, J. Melchior Ligtenberg, Stefan R. M. Antarctic ice shelf thickness change from multimission lidar mapping |
author_facet |
Sutterley, Tyler C. Markus, Thorsten Neumann, Thomas A. van den Broeke, Michiel van Wessem, J. Melchior Ligtenberg, Stefan R. M. |
author_sort |
Sutterley, Tyler C. |
title |
Antarctic ice shelf thickness change from multimission lidar mapping |
title_short |
Antarctic ice shelf thickness change from multimission lidar mapping |
title_full |
Antarctic ice shelf thickness change from multimission lidar mapping |
title_fullStr |
Antarctic ice shelf thickness change from multimission lidar mapping |
title_full_unstemmed |
Antarctic ice shelf thickness change from multimission lidar mapping |
title_sort |
antarctic ice shelf thickness change from multimission lidar mapping |
publishDate |
2019 |
url |
https://dspace.library.uu.nl/handle/1874/383756 |
long_lat |
ENVELOPE(59.326,59.326,-67.248,-67.248) ENVELOPE(-72.500,-72.500,-70.416,-70.416) |
geographic |
Antarctic The Antarctic Antarctic Peninsula West Antarctica Wilkins Wilkins Ice Shelf |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula West Antarctica Wilkins Wilkins Ice Shelf |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ice Shelves Pine Island West Antarctica Wilkins Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Ice Shelves Pine Island West Antarctica Wilkins Ice Shelf |
op_relation |
1994-0416 https://dspace.library.uu.nl/handle/1874/383756 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784256206804615168 |