Impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study
Author Posting. © American Meteorological Society, 2016. 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 46 (2016): 3155-3163, doi:10.1175/JPO-D-16-0123.1....
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/8540 2023-05-15T18:33:04+02:00 Impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study Cenedese, Claudia Gatto, V. Marco 2016-10-07 https://hdl.handle.net/1912/8540 en_US eng American Meteorological Society https://doi.org/10.1175/JPO-D-16-0123.1 Journal of Physical Oceanography 46 (2016): 3155-3163 https://hdl.handle.net/1912/8540 doi:10.1175/JPO-D-16-0123.1 Journal of Physical Oceanography 46 (2016): 3155-3163 doi:10.1175/JPO-D-16-0123.1 Glaciers Buoyancy Density currents Turbulence Laboratory/physical models Article 2016 ftwhoas https://doi.org/10.1175/JPO-D-16-0123.1 2022-05-28T22:59:45Z Author Posting. © American Meteorological Society, 2016. 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 46 (2016): 3155-3163, doi:10.1175/JPO-D-16-0123.1. Idealized laboratory experiments have been conducted in a two-layer stratified fluid to investigate the leading-order dynamics that control submarine melting and meltwater export near a vertical ice–ocean interface as a function of subglacial discharge. In summer, the discharge of surface runoff at the base of a glacier (subglacial discharge) generates strong buoyant plumes that rise along the glacier front entraining ambient water along the way. The entrainment enhances the heat transport toward the glacier front and hence the submarine melt rate increases with the subglacial discharge rate. In the laboratory, the effect of subglacial discharge is simulated by introducing freshwater at freezing temperature from a point source at the base of an ice block representing the glacier. The circulation pattern observed both with and without subglacial discharge resembles those observed in previous observational and numerical studies. Buoyant plumes rise vertically until they find either their neutrally buoyant level or the free surface. Hence, the meltwater can deposit within the interior of the water column and not entirely at the free surface, as confirmed by field observations. The heat budget in the tank, calculated following a new framework, gives estimates of submarine melt rate that increase with the subglacial discharge and are in agreement with the directly measured submarine melting. This laboratory study provides the first direct measurements of submarine melt rates for different subglacial discharges, and the results are consistent with the predictions of previous theoretical and numerical studies. Support to C. C. was given by the NSF project OCE- 1130008 and OCE-1434041. M. G. received support from the ... Article in Journal/Newspaper Tidewater Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Journal of Physical Oceanography 46 10 3155 3163 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Glaciers Buoyancy Density currents Turbulence Laboratory/physical models |
spellingShingle |
Glaciers Buoyancy Density currents Turbulence Laboratory/physical models Cenedese, Claudia Gatto, V. Marco Impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study |
topic_facet |
Glaciers Buoyancy Density currents Turbulence Laboratory/physical models |
description |
Author Posting. © American Meteorological Society, 2016. 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 46 (2016): 3155-3163, doi:10.1175/JPO-D-16-0123.1. Idealized laboratory experiments have been conducted in a two-layer stratified fluid to investigate the leading-order dynamics that control submarine melting and meltwater export near a vertical ice–ocean interface as a function of subglacial discharge. In summer, the discharge of surface runoff at the base of a glacier (subglacial discharge) generates strong buoyant plumes that rise along the glacier front entraining ambient water along the way. The entrainment enhances the heat transport toward the glacier front and hence the submarine melt rate increases with the subglacial discharge rate. In the laboratory, the effect of subglacial discharge is simulated by introducing freshwater at freezing temperature from a point source at the base of an ice block representing the glacier. The circulation pattern observed both with and without subglacial discharge resembles those observed in previous observational and numerical studies. Buoyant plumes rise vertically until they find either their neutrally buoyant level or the free surface. Hence, the meltwater can deposit within the interior of the water column and not entirely at the free surface, as confirmed by field observations. The heat budget in the tank, calculated following a new framework, gives estimates of submarine melt rate that increase with the subglacial discharge and are in agreement with the directly measured submarine melting. This laboratory study provides the first direct measurements of submarine melt rates for different subglacial discharges, and the results are consistent with the predictions of previous theoretical and numerical studies. Support to C. C. was given by the NSF project OCE- 1130008 and OCE-1434041. M. G. received support from the ... |
format |
Article in Journal/Newspaper |
author |
Cenedese, Claudia Gatto, V. Marco |
author_facet |
Cenedese, Claudia Gatto, V. Marco |
author_sort |
Cenedese, Claudia |
title |
Impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study |
title_short |
Impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study |
title_full |
Impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study |
title_fullStr |
Impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study |
title_full_unstemmed |
Impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study |
title_sort |
impact of a localized source of subglacial discharge on the heat flux and submarine melting of a tidewater glacier : a laboratory study |
publisher |
American Meteorological Society |
publishDate |
2016 |
url |
https://hdl.handle.net/1912/8540 |
genre |
Tidewater |
genre_facet |
Tidewater |
op_source |
Journal of Physical Oceanography 46 (2016): 3155-3163 doi:10.1175/JPO-D-16-0123.1 |
op_relation |
https://doi.org/10.1175/JPO-D-16-0123.1 Journal of Physical Oceanography 46 (2016): 3155-3163 https://hdl.handle.net/1912/8540 doi:10.1175/JPO-D-16-0123.1 |
op_doi |
https://doi.org/10.1175/JPO-D-16-0123.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
46 |
container_issue |
10 |
container_start_page |
3155 |
op_container_end_page |
3163 |
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1766217357630373888 |