Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica
Variability in the heat delivery by Circumpolar Deep Water (CDW) is responsible for modulating the basal melting of the Amundsen Sea ice shelves. However, the mechanisms controlling the CDW inflow to the region’s continental shelf remain little understood. Here, a high-resolution regional model is u...
Published in: | Journal of Physical Oceanography |
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American Meteorological Society
2019
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Online Access: | http://nora.nerc.ac.uk/id/eprint/525109/ https://nora.nerc.ac.uk/id/eprint/525109/1/Wind-driven%20processes%20controlling.pdf https://journals.ametsoc.org/doi/abs/10.1175/JPO-D-19-0064.1 |
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ftnerc:oai:nora.nerc.ac.uk:525109 2023-05-15T13:23:37+02:00 Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica Dotto, Tiago S. Naveira Garabato, Alberto C. Bacon, Sheldon Holland, Paul R. Kimura, Satoshi Firing, Yvonne L. Tsamados, Michel Wåhlin, Anna K. Jenkins, Adrian 2019-09-10 text http://nora.nerc.ac.uk/id/eprint/525109/ https://nora.nerc.ac.uk/id/eprint/525109/1/Wind-driven%20processes%20controlling.pdf https://journals.ametsoc.org/doi/abs/10.1175/JPO-D-19-0064.1 en eng American Meteorological Society https://nora.nerc.ac.uk/id/eprint/525109/1/Wind-driven%20processes%20controlling.pdf Dotto, Tiago S.; Naveira Garabato, Alberto C.; Bacon, Sheldon orcid:0000-0002-2471-9373 Holland, Paul R. orcid:0000-0001-8370-289X Kimura, Satoshi; Firing, Yvonne L. orcid:0000-0002-3640-3974 Tsamados, Michel; Wåhlin, Anna K.; Jenkins, Adrian orcid:0000-0002-9117-0616 . 2019 Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica. Journal of Physical Oceanography, 49 (11). 2829-2849. https://doi.org/10.1175/JPO-D-19-0064.1 <https://doi.org/10.1175/JPO-D-19-0064.1> cc_by_4 CC-BY Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.1175/JPO-D-19-0064.1 2023-02-04T19:49:15Z Variability in the heat delivery by Circumpolar Deep Water (CDW) is responsible for modulating the basal melting of the Amundsen Sea ice shelves. However, the mechanisms controlling the CDW inflow to the region’s continental shelf remain little understood. Here, a high-resolution regional model is used to assess the processes governing heat delivery to the Amundsen Sea. The key mechanisms are identified by decomposing CDW temperature variability into two components associated with (1) changes in the depth of isopycnals (heave; HVE), and (2) changes in the temperature of isopycnals (water mass property changes; WMP). In the Dotson-Getz trough, CDW temperature variability is primarily associated with WMP. The deeper thermocline and shallower shelf break hinder CDW access to that trough, and CDW inflow is regulated by the uplift of isopycnals at the shelf break – which is itself controlled by wind-driven variations in the speed of an undercurrent flowing eastward along the continental slope. In contrast, CDW temperature variability in the Pine Island-Thwaites trough is mainly linked to HVE. The shallower thermocline and deeper shelf break there permit CDW to persistently access the continental shelf. CDW temperature in the area responds to wind-driven modulation of the water mass’ on-shelf volume by changes in the rate of inflow across the shelf break and in Ekman pumping-induced vertical displacement of isopycnals within the shelf. The western and eastern Amundsen Sea thus represent distinct regimes, in which wind forcing governs CDW-mediated heat delivery via different dynamics. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctica Antarctica Journal Ice Shelves Pine Island Sea ice Natural Environment Research Council: NERC Open Research Archive Amundsen Sea Getz ENVELOPE(-145.217,-145.217,-76.550,-76.550) Dotson-Getz Trough ENVELOPE(-114.775,-114.775,-73.231,-73.231) Journal of Physical Oceanography 49 11 2829 2849 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Variability in the heat delivery by Circumpolar Deep Water (CDW) is responsible for modulating the basal melting of the Amundsen Sea ice shelves. However, the mechanisms controlling the CDW inflow to the region’s continental shelf remain little understood. Here, a high-resolution regional model is used to assess the processes governing heat delivery to the Amundsen Sea. The key mechanisms are identified by decomposing CDW temperature variability into two components associated with (1) changes in the depth of isopycnals (heave; HVE), and (2) changes in the temperature of isopycnals (water mass property changes; WMP). In the Dotson-Getz trough, CDW temperature variability is primarily associated with WMP. The deeper thermocline and shallower shelf break hinder CDW access to that trough, and CDW inflow is regulated by the uplift of isopycnals at the shelf break – which is itself controlled by wind-driven variations in the speed of an undercurrent flowing eastward along the continental slope. In contrast, CDW temperature variability in the Pine Island-Thwaites trough is mainly linked to HVE. The shallower thermocline and deeper shelf break there permit CDW to persistently access the continental shelf. CDW temperature in the area responds to wind-driven modulation of the water mass’ on-shelf volume by changes in the rate of inflow across the shelf break and in Ekman pumping-induced vertical displacement of isopycnals within the shelf. The western and eastern Amundsen Sea thus represent distinct regimes, in which wind forcing governs CDW-mediated heat delivery via different dynamics. |
format |
Article in Journal/Newspaper |
author |
Dotto, Tiago S. Naveira Garabato, Alberto C. Bacon, Sheldon Holland, Paul R. Kimura, Satoshi Firing, Yvonne L. Tsamados, Michel Wåhlin, Anna K. Jenkins, Adrian |
spellingShingle |
Dotto, Tiago S. Naveira Garabato, Alberto C. Bacon, Sheldon Holland, Paul R. Kimura, Satoshi Firing, Yvonne L. Tsamados, Michel Wåhlin, Anna K. Jenkins, Adrian Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica |
author_facet |
Dotto, Tiago S. Naveira Garabato, Alberto C. Bacon, Sheldon Holland, Paul R. Kimura, Satoshi Firing, Yvonne L. Tsamados, Michel Wåhlin, Anna K. Jenkins, Adrian |
author_sort |
Dotto, Tiago S. |
title |
Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica |
title_short |
Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica |
title_full |
Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica |
title_fullStr |
Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica |
title_full_unstemmed |
Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica |
title_sort |
wind-driven processes controlling oceanic heat delivery to the amundsen sea, antarctica |
publisher |
American Meteorological Society |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/525109/ https://nora.nerc.ac.uk/id/eprint/525109/1/Wind-driven%20processes%20controlling.pdf https://journals.ametsoc.org/doi/abs/10.1175/JPO-D-19-0064.1 |
long_lat |
ENVELOPE(-145.217,-145.217,-76.550,-76.550) ENVELOPE(-114.775,-114.775,-73.231,-73.231) |
geographic |
Amundsen Sea Getz Dotson-Getz Trough |
geographic_facet |
Amundsen Sea Getz Dotson-Getz Trough |
genre |
Amundsen Sea Antarc* Antarctica Antarctica Journal Ice Shelves Pine Island Sea ice |
genre_facet |
Amundsen Sea Antarc* Antarctica Antarctica Journal Ice Shelves Pine Island Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/525109/1/Wind-driven%20processes%20controlling.pdf Dotto, Tiago S.; Naveira Garabato, Alberto C.; Bacon, Sheldon orcid:0000-0002-2471-9373 Holland, Paul R. orcid:0000-0001-8370-289X Kimura, Satoshi; Firing, Yvonne L. orcid:0000-0002-3640-3974 Tsamados, Michel; Wåhlin, Anna K.; Jenkins, Adrian orcid:0000-0002-9117-0616 . 2019 Wind-driven processes controlling oceanic heat delivery to the Amundsen Sea, Antarctica. Journal of Physical Oceanography, 49 (11). 2829-2849. https://doi.org/10.1175/JPO-D-19-0064.1 <https://doi.org/10.1175/JPO-D-19-0064.1> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1175/JPO-D-19-0064.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
49 |
container_issue |
11 |
container_start_page |
2829 |
op_container_end_page |
2849 |
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1766373548929056768 |