High-resolution simulations of the plume dynamics in an idealized 79°N Glacier cavity using adaptive vertical coordinates
For better projections of sea level rise, two things are needed: an improved understanding of the contributing processes and their accurate representation in climate models. A major process is basal melting of ice shelves and glacier tongues by the ocean, which reduces ice sheet stability and increa...
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Online Access: | http://dx.doi.org/10.22541/essoar.167979227.75015410/v1 |
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crwinnower:10.22541/essoar.167979227.75015410/v1 2024-06-02T08:08:19+00:00 High-resolution simulations of the plume dynamics in an idealized 79°N Glacier cavity using adaptive vertical coordinates Reinert, Markus Lorenz, Marvin Klingbeil, Knut Büchmann, Bjarne Buchard, Hans 2023 http://dx.doi.org/10.22541/essoar.167979227.75015410/v1 unknown Authorea, Inc. posted-content 2023 crwinnower https://doi.org/10.22541/essoar.167979227.75015410/v1 2024-05-07T14:19:27Z For better projections of sea level rise, two things are needed: an improved understanding of the contributing processes and their accurate representation in climate models. A major process is basal melting of ice shelves and glacier tongues by the ocean, which reduces ice sheet stability and increases ice discharge into the ocean. We study marine melting of Greenland’s largest floating ice tongue, the 79° North Glacier, using a high-resolution, 2D-vertical ocean model. While our fjord model is idealized, the results agree with observations of the meltrate and the overturning strength. Our setup is the first application of adaptive vertical coordinates to an ice cavity. Their stratification-zooming allows a vertical resolution finer than 1 m in the entrainment layer of the meltwater plume, which is important for the plume development. In a sensitivity study, we show that the buoyant plume at the ice–ocean interface is responsible for the bulk of basal melting. The melting almost stops when the plume has reached neutral buoyancy. There, the plume detaches from the ice tongue and transports meltwater out of the fjord. The detachment depth depends primarily on the ambient ocean stratification. Our results contribute to the understanding of ice–ocean interactions in glacier cavities. Furthermore, we suggest that our modeling approach with stratification-zooming coordinates will improve the representation of these interactions in global ocean models. Finally, our idealized model topography and forcing are close to a real fjord and completely defined analytically, making the setup an interesting reference case for future model developments. Other/Unknown Material Ice Sheet Ice Shelves The Winnower |
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For better projections of sea level rise, two things are needed: an improved understanding of the contributing processes and their accurate representation in climate models. A major process is basal melting of ice shelves and glacier tongues by the ocean, which reduces ice sheet stability and increases ice discharge into the ocean. We study marine melting of Greenland’s largest floating ice tongue, the 79° North Glacier, using a high-resolution, 2D-vertical ocean model. While our fjord model is idealized, the results agree with observations of the meltrate and the overturning strength. Our setup is the first application of adaptive vertical coordinates to an ice cavity. Their stratification-zooming allows a vertical resolution finer than 1 m in the entrainment layer of the meltwater plume, which is important for the plume development. In a sensitivity study, we show that the buoyant plume at the ice–ocean interface is responsible for the bulk of basal melting. The melting almost stops when the plume has reached neutral buoyancy. There, the plume detaches from the ice tongue and transports meltwater out of the fjord. The detachment depth depends primarily on the ambient ocean stratification. Our results contribute to the understanding of ice–ocean interactions in glacier cavities. Furthermore, we suggest that our modeling approach with stratification-zooming coordinates will improve the representation of these interactions in global ocean models. Finally, our idealized model topography and forcing are close to a real fjord and completely defined analytically, making the setup an interesting reference case for future model developments. |
format |
Other/Unknown Material |
author |
Reinert, Markus Lorenz, Marvin Klingbeil, Knut Büchmann, Bjarne Buchard, Hans |
spellingShingle |
Reinert, Markus Lorenz, Marvin Klingbeil, Knut Büchmann, Bjarne Buchard, Hans High-resolution simulations of the plume dynamics in an idealized 79°N Glacier cavity using adaptive vertical coordinates |
author_facet |
Reinert, Markus Lorenz, Marvin Klingbeil, Knut Büchmann, Bjarne Buchard, Hans |
author_sort |
Reinert, Markus |
title |
High-resolution simulations of the plume dynamics in an idealized 79°N Glacier cavity using adaptive vertical coordinates |
title_short |
High-resolution simulations of the plume dynamics in an idealized 79°N Glacier cavity using adaptive vertical coordinates |
title_full |
High-resolution simulations of the plume dynamics in an idealized 79°N Glacier cavity using adaptive vertical coordinates |
title_fullStr |
High-resolution simulations of the plume dynamics in an idealized 79°N Glacier cavity using adaptive vertical coordinates |
title_full_unstemmed |
High-resolution simulations of the plume dynamics in an idealized 79°N Glacier cavity using adaptive vertical coordinates |
title_sort |
high-resolution simulations of the plume dynamics in an idealized 79°n glacier cavity using adaptive vertical coordinates |
publisher |
Authorea, Inc. |
publishDate |
2023 |
url |
http://dx.doi.org/10.22541/essoar.167979227.75015410/v1 |
genre |
Ice Sheet Ice Shelves |
genre_facet |
Ice Sheet Ice Shelves |
op_doi |
https://doi.org/10.22541/essoar.167979227.75015410/v1 |
_version_ |
1800753530083999744 |