Modelling Antarctic ice shelf basal melt patterns using the one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges (LADDIE v1.0)
A major source of uncertainty in future sea level projections is the ocean-driven basal melt of Antarctic ice shelves. While ice sheet models require a kilometre-scale resolution to realistically resolve ice shelf stability and grounding line migration, global or regional 3D ocean models are computa...
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Online Access: | https://dspace.library.uu.nl/handle/1874/432508 |
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ftunivutrecht:oai:dspace.library.uu.nl:1874/432508 2023-11-12T04:00:58+01:00 Modelling Antarctic ice shelf basal melt patterns using the one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges (LADDIE v1.0) Lambert, Erwin Jüling, André Van De Wal, Roderik S.W. Holland, Paul R. Sub Dynamics Meteorology Afd Marine and Atmospheric Research Proceskunde Sub Algemeen Marine & Atmospheric Res 2023-08-09 application/pdf https://dspace.library.uu.nl/handle/1874/432508 en eng 1994-0416 https://dspace.library.uu.nl/handle/1874/432508 info:eu-repo/semantics/OpenAccess Pine island glacier Grounding line Sheet Parameterization Circulation Retreat Rates Water Ross Parameterisations Water Science and Technology Earth-Surface Processes Article 2023 ftunivutrecht 2023-11-01T23:31:09Z A major source of uncertainty in future sea level projections is the ocean-driven basal melt of Antarctic ice shelves. While ice sheet models require a kilometre-scale resolution to realistically resolve ice shelf stability and grounding line migration, global or regional 3D ocean models are computationally too expensive to produce basal melt forcing fields at this resolution on long timescales. To bridge this resolution gap, we introduce the 2D numerical model LADDIE (one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges), which allows for the computationally efficient modelling of detailed basal melt fields. The model is open source and can be applied easily to different geometries or different ocean forcings. The aim of this study is threefold: to introduce the model to the community, to demonstrate its application and performance in two use cases, and to describe and interpret new basal melt patterns simulated by this model. The two use cases are the small Crosson-Dotson Ice Shelf in the warm Amundsen Sea region and the large Filchner-Ronne Ice Shelf in the cold Weddell Sea. At ice-shelf-wide scales, LADDIE reproduces observed patterns of basal melting and freezing in warm and cold environments without the need to re-tune parameters for individual ice shelves. At scales of 0.5-5ĝ€¯km, which are typically unresolved by 3D ocean models and poorly constrained by observations, LADDIE produces plausible basal melt patterns. Most significantly, the simulated basal melt patterns are physically consistent with the applied ice shelf topography. These patterns are governed by the topographic steering and Coriolis deflection of meltwater flows, two processes that are poorly represented in basal melt parameterisations. The kilometre-scale melt patterns simulated by LADDIE include enhanced melt rates in grounding zones and basal channels and enhanced melt or freezing in shear margins. As these regions are critical for ice shelf stability, we conclude that LADDIE can provide detailed basal melt ... Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Dotson Ice Shelf Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ice Shelves Pine Island Glacier Ronne Ice Shelf Weddell Sea Utrecht University Repository Amundsen Sea Antarctic Dotson Ice Shelf ENVELOPE(-112.367,-112.367,-74.400,-74.400) Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Weddell Weddell Sea |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Pine island glacier Grounding line Sheet Parameterization Circulation Retreat Rates Water Ross Parameterisations Water Science and Technology Earth-Surface Processes |
spellingShingle |
Pine island glacier Grounding line Sheet Parameterization Circulation Retreat Rates Water Ross Parameterisations Water Science and Technology Earth-Surface Processes Lambert, Erwin Jüling, André Van De Wal, Roderik S.W. Holland, Paul R. Modelling Antarctic ice shelf basal melt patterns using the one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges (LADDIE v1.0) |
topic_facet |
Pine island glacier Grounding line Sheet Parameterization Circulation Retreat Rates Water Ross Parameterisations Water Science and Technology Earth-Surface Processes |
description |
A major source of uncertainty in future sea level projections is the ocean-driven basal melt of Antarctic ice shelves. While ice sheet models require a kilometre-scale resolution to realistically resolve ice shelf stability and grounding line migration, global or regional 3D ocean models are computationally too expensive to produce basal melt forcing fields at this resolution on long timescales. To bridge this resolution gap, we introduce the 2D numerical model LADDIE (one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges), which allows for the computationally efficient modelling of detailed basal melt fields. The model is open source and can be applied easily to different geometries or different ocean forcings. The aim of this study is threefold: to introduce the model to the community, to demonstrate its application and performance in two use cases, and to describe and interpret new basal melt patterns simulated by this model. The two use cases are the small Crosson-Dotson Ice Shelf in the warm Amundsen Sea region and the large Filchner-Ronne Ice Shelf in the cold Weddell Sea. At ice-shelf-wide scales, LADDIE reproduces observed patterns of basal melting and freezing in warm and cold environments without the need to re-tune parameters for individual ice shelves. At scales of 0.5-5ĝ€¯km, which are typically unresolved by 3D ocean models and poorly constrained by observations, LADDIE produces plausible basal melt patterns. Most significantly, the simulated basal melt patterns are physically consistent with the applied ice shelf topography. These patterns are governed by the topographic steering and Coriolis deflection of meltwater flows, two processes that are poorly represented in basal melt parameterisations. The kilometre-scale melt patterns simulated by LADDIE include enhanced melt rates in grounding zones and basal channels and enhanced melt or freezing in shear margins. As these regions are critical for ice shelf stability, we conclude that LADDIE can provide detailed basal melt ... |
author2 |
Sub Dynamics Meteorology Afd Marine and Atmospheric Research Proceskunde Sub Algemeen Marine & Atmospheric Res |
format |
Article in Journal/Newspaper |
author |
Lambert, Erwin Jüling, André Van De Wal, Roderik S.W. Holland, Paul R. |
author_facet |
Lambert, Erwin Jüling, André Van De Wal, Roderik S.W. Holland, Paul R. |
author_sort |
Lambert, Erwin |
title |
Modelling Antarctic ice shelf basal melt patterns using the one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges (LADDIE v1.0) |
title_short |
Modelling Antarctic ice shelf basal melt patterns using the one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges (LADDIE v1.0) |
title_full |
Modelling Antarctic ice shelf basal melt patterns using the one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges (LADDIE v1.0) |
title_fullStr |
Modelling Antarctic ice shelf basal melt patterns using the one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges (LADDIE v1.0) |
title_full_unstemmed |
Modelling Antarctic ice shelf basal melt patterns using the one-layer Antarctic model for dynamical downscaling of ice-ocean exchanges (LADDIE v1.0) |
title_sort |
modelling antarctic ice shelf basal melt patterns using the one-layer antarctic model for dynamical downscaling of ice-ocean exchanges (laddie v1.0) |
publishDate |
2023 |
url |
https://dspace.library.uu.nl/handle/1874/432508 |
long_lat |
ENVELOPE(-112.367,-112.367,-74.400,-74.400) ENVELOPE(-101.000,-101.000,-75.000,-75.000) ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Amundsen Sea Antarctic Dotson Ice Shelf Pine Island Glacier Ronne Ice Shelf Weddell Weddell Sea |
geographic_facet |
Amundsen Sea Antarctic Dotson Ice Shelf Pine Island Glacier Ronne Ice Shelf Weddell Weddell Sea |
genre |
Amundsen Sea Antarc* Antarctic Dotson Ice Shelf Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ice Shelves Pine Island Glacier Ronne Ice Shelf Weddell Sea |
genre_facet |
Amundsen Sea Antarc* Antarctic Dotson Ice Shelf Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Sheet Ice Shelf Ice Shelves Pine Island Glacier Ronne Ice Shelf Weddell Sea |
op_relation |
1994-0416 https://dspace.library.uu.nl/handle/1874/432508 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782329065039986688 |