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Ocean mixing beneath Pine Island Glacier ice shelf, West Antarctica

Ocean mixing beneath Pine Island Glacier ice shelf, West Antarctica
Ocean mixing beneath Pine Island Glacier ice shelf, West Antarctica


Ice shelves around Antarctica are vulnerable to an increase in ocean-driven melting, with the melt rate depending on ocean temperature and the strength of flow inside the ice-shelf cavities. We present measurements of velocity, temperature, salinity, turbulent kinetic energy dissipation rate, and thermal variance dissipation rate beneath Pine Island Glacier ice shelf, West Antarctica. These measurements were obtained by CTD, ADCP, and turbulence sensors mounted on an Autonomous Underwater Vehicle (AUV). The highest turbulent kinetic energy dissipation rate is found near the grounding line. The thermal variance dissipation rate increases closer to the ice-shelf base, with a maximum value found ?0.5 m away from the ice. The measurements of turbulent kinetic energy dissipation rate near the ice are used to estimate basal melting of the ice shelf. The dissipation-rate-based melt rate estimates is sensitive to the stability correction parameter in the linear approximation of universal function of the Monin-Obukhov similarity theory for stratified boundary layers. We argue that our estimates of basal melting from dissipation rates are within a range of previous estimates of basal melting.
ice-shelf cavity circulation, ice-shelf-ocean interactions
8496-8510
Kimura, Satoshi
c2d72821-b5a4-4407-95f8-d2204e771007
Jenkins, Adrian
ae892509-d8d8-4176-99b2-66cc717ef376
Dutrieux, Pierre
366b1813-3d70-4202-aabb-0e314e3d99b7
Forryan, Alexander
4e753ae9-7f12-495f-933a-2c5a1f554a0e
Naveira Garabato, Alberto C.
97c0e923-f076-4b38-b89b-938e11cea7a6
Firing, Yvonne
ca398f62-26d4-4b06-b879-628bab65bd5a
Kimura, Satoshi
c2d72821-b5a4-4407-95f8-d2204e771007
Jenkins, Adrian
ae892509-d8d8-4176-99b2-66cc717ef376
Dutrieux, Pierre
366b1813-3d70-4202-aabb-0e314e3d99b7
Forryan, Alexander
4e753ae9-7f12-495f-933a-2c5a1f554a0e
Naveira Garabato, Alberto C.
97c0e923-f076-4b38-b89b-938e11cea7a6
Firing, Yvonne
ca398f62-26d4-4b06-b879-628bab65bd5a

Kimura, Satoshi, Jenkins, Adrian, Dutrieux, Pierre, Forryan, Alexander, Naveira Garabato, Alberto C. and Firing, Yvonne (2016) Ocean mixing beneath Pine Island Glacier ice shelf, West Antarctica. Journal of Geophysical Research: Oceans, 121 (12), 8496-8510. (doi:10.1002/2016JC012149).

Record type: Article

Abstract



Ice shelves around Antarctica are vulnerable to an increase in ocean-driven melting, with the melt rate depending on ocean temperature and the strength of flow inside the ice-shelf cavities. We present measurements of velocity, temperature, salinity, turbulent kinetic energy dissipation rate, and thermal variance dissipation rate beneath Pine Island Glacier ice shelf, West Antarctica. These measurements were obtained by CTD, ADCP, and turbulence sensors mounted on an Autonomous Underwater Vehicle (AUV). The highest turbulent kinetic energy dissipation rate is found near the grounding line. The thermal variance dissipation rate increases closer to the ice-shelf base, with a maximum value found ?0.5 m away from the ice. The measurements of turbulent kinetic energy dissipation rate near the ice are used to estimate basal melting of the ice shelf. The dissipation-rate-based melt rate estimates is sensitive to the stability correction parameter in the linear approximation of universal function of the Monin-Obukhov similarity theory for stratified boundary layers. We argue that our estimates of basal melting from dissipation rates are within a range of previous estimates of basal melting.

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More information

Accepted/In Press date: 6 November 2016
e-pub ahead of print date: 7 December 2016
Published date: December 2016
Keywords: ice-shelf cavity circulation, ice-shelf-ocean interactions
Organisations: Ocean and Earth Science, Marine Physics and Ocean Climate

Identifiers

Local EPrints ID: 405807
URI: http://eprints.soton.ac.uk/id/eprint/405807
PURE UUID: 7a4b766b-f2d7-4314-83b5-cfe4ba636d28

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Date deposited: 10 Feb 2017 16:17
Last modified: 09 Jan 2022 05:28

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Contributors

Author: Satoshi Kimura
Author: Adrian Jenkins
Author: Pierre Dutrieux
Author: Alexander Forryan
Author: Yvonne Firing

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