Surface expression of a wall fountain: application to subglacial discharge plumes
Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(5), (2020): 1245-1263, doi:10.1175/JPO-D-19-0213...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/25922 2023-05-15T16:21:29+02:00 Surface expression of a wall fountain: application to subglacial discharge plumes McConnochie, Craig D. Cenedese, Claudia McElwaine, Jim N. 2020-04-27 https://hdl.handle.net/1912/25922 unknown American Meteorological Society https://doi.org/10.1175/JPO-D-19-0213.1 McConnochie, C. D., Cenedese, C., & McElwaine, J. N. (2020). Surface expression of a wall fountain: application to subglacial discharge plumes. Journal of Physical Oceanography, 50(5), 1245-1263. https://hdl.handle.net/1912/25922 doi:10.1175/JPO-D-19-0213.1 McConnochie, C. D., Cenedese, C., & McElwaine, J. N. (2020). Surface expression of a wall fountain: application to subglacial discharge plumes. Journal of Physical Oceanography, 50(5), 1245-1263. doi:10.1175/JPO-D-19-0213.1 Ocean Glaciers Ice sheets Convection Laboratory/physical models Article 2020 ftwhoas https://doi.org/10.1175/JPO-D-19-0213.1 2022-05-28T23:03:43Z Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(5), (2020): 1245-1263, doi:10.1175/JPO-D-19-0213.1. We use laboratory experiments and theoretical modeling to investigate the surface expression of a subglacial discharge plume, as occurs at many fjords around Greenland. The experiments consider a fountain that is released vertically into a homogeneous fluid, adjacent either to a vertical or a sloping wall, that then spreads horizontally at the free surface before sinking back to the bottom. We present a model that separates the fountain into two separate regions: a vertical fountain and a horizontal, negatively buoyant jet. The model is compared to laboratory experiments that are conducted over a range of volume fluxes, density differences, and ambient fluid depths. It is shown that the nondimensionalized length, width, and aspect ratio of the surface expression are dependent on the Froude number, calculated at the start of the negatively buoyant jet. The model is applied to observations of the surface expression from a Greenland subglacial discharge plume. In the case where the discharge plume reaches the surface with negative buoyancy the model can be used to estimate the discharge properties at the base of the glacier. We gratefully acknowledge technical assistance from Anders Jensen and thank anonymous reviewers for improving the clarity of the manuscript. CM thanks the Weston Howard Jr. Scholarship for funding. Support to CC was given by NSF project OCE-1434041 and OCE-1658079. 2020-10-27 Article in Journal/Newspaper glacier Greenland Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Greenland Journal of Physical Oceanography 50 5 1245 1263 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Ocean Glaciers Ice sheets Convection Laboratory/physical models |
spellingShingle |
Ocean Glaciers Ice sheets Convection Laboratory/physical models McConnochie, Craig D. Cenedese, Claudia McElwaine, Jim N. Surface expression of a wall fountain: application to subglacial discharge plumes |
topic_facet |
Ocean Glaciers Ice sheets Convection Laboratory/physical models |
description |
Author Posting. © American Meteorological Society, 2020. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 50(5), (2020): 1245-1263, doi:10.1175/JPO-D-19-0213.1. We use laboratory experiments and theoretical modeling to investigate the surface expression of a subglacial discharge plume, as occurs at many fjords around Greenland. The experiments consider a fountain that is released vertically into a homogeneous fluid, adjacent either to a vertical or a sloping wall, that then spreads horizontally at the free surface before sinking back to the bottom. We present a model that separates the fountain into two separate regions: a vertical fountain and a horizontal, negatively buoyant jet. The model is compared to laboratory experiments that are conducted over a range of volume fluxes, density differences, and ambient fluid depths. It is shown that the nondimensionalized length, width, and aspect ratio of the surface expression are dependent on the Froude number, calculated at the start of the negatively buoyant jet. The model is applied to observations of the surface expression from a Greenland subglacial discharge plume. In the case where the discharge plume reaches the surface with negative buoyancy the model can be used to estimate the discharge properties at the base of the glacier. We gratefully acknowledge technical assistance from Anders Jensen and thank anonymous reviewers for improving the clarity of the manuscript. CM thanks the Weston Howard Jr. Scholarship for funding. Support to CC was given by NSF project OCE-1434041 and OCE-1658079. 2020-10-27 |
format |
Article in Journal/Newspaper |
author |
McConnochie, Craig D. Cenedese, Claudia McElwaine, Jim N. |
author_facet |
McConnochie, Craig D. Cenedese, Claudia McElwaine, Jim N. |
author_sort |
McConnochie, Craig D. |
title |
Surface expression of a wall fountain: application to subglacial discharge plumes |
title_short |
Surface expression of a wall fountain: application to subglacial discharge plumes |
title_full |
Surface expression of a wall fountain: application to subglacial discharge plumes |
title_fullStr |
Surface expression of a wall fountain: application to subglacial discharge plumes |
title_full_unstemmed |
Surface expression of a wall fountain: application to subglacial discharge plumes |
title_sort |
surface expression of a wall fountain: application to subglacial discharge plumes |
publisher |
American Meteorological Society |
publishDate |
2020 |
url |
https://hdl.handle.net/1912/25922 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland |
genre_facet |
glacier Greenland |
op_source |
McConnochie, C. D., Cenedese, C., & McElwaine, J. N. (2020). Surface expression of a wall fountain: application to subglacial discharge plumes. Journal of Physical Oceanography, 50(5), 1245-1263. doi:10.1175/JPO-D-19-0213.1 |
op_relation |
https://doi.org/10.1175/JPO-D-19-0213.1 McConnochie, C. D., Cenedese, C., & McElwaine, J. N. (2020). Surface expression of a wall fountain: application to subglacial discharge plumes. Journal of Physical Oceanography, 50(5), 1245-1263. https://hdl.handle.net/1912/25922 doi:10.1175/JPO-D-19-0213.1 |
op_doi |
https://doi.org/10.1175/JPO-D-19-0213.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
50 |
container_issue |
5 |
container_start_page |
1245 |
op_container_end_page |
1263 |
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1766009492045037568 |