Subglacial discharge‐driven renewal of tidewater glacier fjords
The classic model of fjord renewal is complicated by tidewater glacier fjords, where submarine melt and subglacial discharge provide substantial buoyancy forcing at depth. Here we use a suite of idealized, high‐resolution numerical ocean simulations to investigate how fjord circulation driven by sub...
Published in: | Journal of Geophysical Research: Oceans |
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2018
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Online Access: | http://hdl.handle.net/1808/27328 https://doi.org/10.1002/2017JC012962 |
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/27328 2023-05-15T18:33:03+02:00 Subglacial discharge‐driven renewal of tidewater glacier fjords Carroll, Dustin Sutherland, David A. Shroyer, Emily L. Nash, Jonathan D. Catania, Ginny A. Stearns, Leigh A. 2018-11-13T21:22:26Z http://hdl.handle.net/1808/27328 https://doi.org/10.1002/2017JC012962 unknown American Geophysical Union Carroll, D., D. A. Sutherland, E. L. Shroyer, J. D. Nash, G. A. Catania, and L. A. Stearns (2017), Subglacial discharge-driven renewal of tidewater glacier fjords, J. Geophys. Res. Oceans, 122, 6611–6629, doi:10.1002/2017JC012962. http://hdl.handle.net/1808/27328 doi:10.1002/2017JC012962 orcid:0000-0003-1686-5255 orcid:0000-0002-2843-8608 orcid:0000-0002-2970-9895 orcid:0000-0002-7561-5902 orcid:0000-0001-7358-7015 © 2017. American Geophysical Union. All Rights Reserved. openAccess Ocean‐ice Physical oceanography Fjord circulation Glacier Meltwater Subglacial plume Article 2018 ftunivkansas https://doi.org/10.1002/2017JC012962 2022-08-26T13:23:49Z The classic model of fjord renewal is complicated by tidewater glacier fjords, where submarine melt and subglacial discharge provide substantial buoyancy forcing at depth. Here we use a suite of idealized, high‐resolution numerical ocean simulations to investigate how fjord circulation driven by subglacial plumes, tides, and wind stress depends on fjord width, grounding line depth, and sill height. We find that the depth of the grounding line compared to the sill is a primary control on plume‐driven renewal of basin waters. In wide fjords the plume exhibits strong lateral recirculation, increasing the dilution and residence time of glacially‐modified waters. Rapid drawdown of basin waters by the subglacial plume in narrow fjords allows for shelf waters to cascade deep into the basin; wide fjords result in a thin, boundary current of shelf waters that flow toward the terminus slightly below sill depth. Wind forcing amplifies the plume‐driven exchange flow; however, wind‐induced vertical mixing is limited to near‐surface waters. Tidal mixing over the sill increases in‐fjord transport of deep shelf waters and erodes basin stratification above the sill depth. These results underscore the first‐order importances of fjord‐glacier geometry in controlling circulation in tidewater glacier fjords and, thus, ocean heat transport to the ice. NNX12AP50G 1504521 Article in Journal/Newspaper Tidewater The University of Kansas: KU ScholarWorks Journal of Geophysical Research: Oceans 122 8 6611 6629 |
institution |
Open Polar |
collection |
The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
unknown |
topic |
Ocean‐ice Physical oceanography Fjord circulation Glacier Meltwater Subglacial plume |
spellingShingle |
Ocean‐ice Physical oceanography Fjord circulation Glacier Meltwater Subglacial plume Carroll, Dustin Sutherland, David A. Shroyer, Emily L. Nash, Jonathan D. Catania, Ginny A. Stearns, Leigh A. Subglacial discharge‐driven renewal of tidewater glacier fjords |
topic_facet |
Ocean‐ice Physical oceanography Fjord circulation Glacier Meltwater Subglacial plume |
description |
The classic model of fjord renewal is complicated by tidewater glacier fjords, where submarine melt and subglacial discharge provide substantial buoyancy forcing at depth. Here we use a suite of idealized, high‐resolution numerical ocean simulations to investigate how fjord circulation driven by subglacial plumes, tides, and wind stress depends on fjord width, grounding line depth, and sill height. We find that the depth of the grounding line compared to the sill is a primary control on plume‐driven renewal of basin waters. In wide fjords the plume exhibits strong lateral recirculation, increasing the dilution and residence time of glacially‐modified waters. Rapid drawdown of basin waters by the subglacial plume in narrow fjords allows for shelf waters to cascade deep into the basin; wide fjords result in a thin, boundary current of shelf waters that flow toward the terminus slightly below sill depth. Wind forcing amplifies the plume‐driven exchange flow; however, wind‐induced vertical mixing is limited to near‐surface waters. Tidal mixing over the sill increases in‐fjord transport of deep shelf waters and erodes basin stratification above the sill depth. These results underscore the first‐order importances of fjord‐glacier geometry in controlling circulation in tidewater glacier fjords and, thus, ocean heat transport to the ice. NNX12AP50G 1504521 |
format |
Article in Journal/Newspaper |
author |
Carroll, Dustin Sutherland, David A. Shroyer, Emily L. Nash, Jonathan D. Catania, Ginny A. Stearns, Leigh A. |
author_facet |
Carroll, Dustin Sutherland, David A. Shroyer, Emily L. Nash, Jonathan D. Catania, Ginny A. Stearns, Leigh A. |
author_sort |
Carroll, Dustin |
title |
Subglacial discharge‐driven renewal of tidewater glacier fjords |
title_short |
Subglacial discharge‐driven renewal of tidewater glacier fjords |
title_full |
Subglacial discharge‐driven renewal of tidewater glacier fjords |
title_fullStr |
Subglacial discharge‐driven renewal of tidewater glacier fjords |
title_full_unstemmed |
Subglacial discharge‐driven renewal of tidewater glacier fjords |
title_sort |
subglacial discharge‐driven renewal of tidewater glacier fjords |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
http://hdl.handle.net/1808/27328 https://doi.org/10.1002/2017JC012962 |
genre |
Tidewater |
genre_facet |
Tidewater |
op_relation |
Carroll, D., D. A. Sutherland, E. L. Shroyer, J. D. Nash, G. A. Catania, and L. A. Stearns (2017), Subglacial discharge-driven renewal of tidewater glacier fjords, J. Geophys. Res. Oceans, 122, 6611–6629, doi:10.1002/2017JC012962. http://hdl.handle.net/1808/27328 doi:10.1002/2017JC012962 orcid:0000-0003-1686-5255 orcid:0000-0002-2843-8608 orcid:0000-0002-2970-9895 orcid:0000-0002-7561-5902 orcid:0000-0001-7358-7015 |
op_rights |
© 2017. American Geophysical Union. All Rights Reserved. openAccess |
op_doi |
https://doi.org/10.1002/2017JC012962 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
8 |
container_start_page |
6611 |
op_container_end_page |
6629 |
_version_ |
1766217345651441664 |