The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing
In situ measurements of flow and stratification in the vicinity of the Erebus Glacier Tongue, a 12 km long floating Antarctic glacier, show the significant influence of the glacier. Three ADCPs (75, 300, and 600 kHz) were deployed close (<50 m) to the sidewall of the glacier in order to capture n...
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ftcdlib:oai:escholarship.org/ark:/13030/qt8kk25604 2023-05-15T14:02:59+02:00 The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing Stevens, CL McPhee, MG Forrest, AL Leonard, GH Stanton, T Haskell, TG 2344 - 2362 2014-01-01 application/pdf https://escholarship.org/uc/item/8kk25604 unknown eScholarship, University of California qt8kk25604 https://escholarship.org/uc/item/8kk25604 public Journal of Geophysical Research: Oceans, vol 119, iss 4 glacier tongue Antarctica ocean mixing blocking turbulence supercooling Geophysics Oceanography Physical Geography and Environmental Geoscience article 2014 ftcdlib 2021-06-20T14:23:13Z In situ measurements of flow and stratification in the vicinity of the Erebus Glacier Tongue, a 12 km long floating Antarctic glacier, show the significant influence of the glacier. Three ADCPs (75, 300, and 600 kHz) were deployed close (<50 m) to the sidewall of the glacier in order to capture near-field flow distortion. Scalar (temperature and conductivity) and shear microstructure profiling captured small-scale vertical variability. Flow magnitudes exceeded 0.3 m s-1 through a combination of tidal flow (8 cm s-1) and a background/residual flow (4-10 cm s-1) flowing to the NW. Turbulence was dominated by deeper mixing during spring tide, likely indicative of the role of bathymetric variation which locally forms an obstacle as great as the glacier. During the neap tide, near-surface mixing was as energetic as that seen in the spring tide, suggesting the presence of buoyancy-driven near-surface flows. Estimates of integrated dissipation rate suggest that these floating extensions of the Antarctic ice sheet alter energy budgets through enhanced dissipation, and thus influence coastal near-surface circulation. Key Points A blocking layer is generated by the floating glacier Tidal rectification or substantial residual flow results in tidal asymmetry Upper water column mixing is at least as strong during neap tides as spring © 2014. American Geophysical Union. All Rights Reserved. Article in Journal/Newspaper Antarc* Antarctic Antarctica Erebus Glacier Ice Sheet University of California: eScholarship Antarctic Erebus Glacier ENVELOPE(167.000,167.000,-77.683,-77.683) Erebus Glacier Tongue ENVELOPE(166.667,166.667,-77.700,-77.700) The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
glacier tongue Antarctica ocean mixing blocking turbulence supercooling Geophysics Oceanography Physical Geography and Environmental Geoscience |
spellingShingle |
glacier tongue Antarctica ocean mixing blocking turbulence supercooling Geophysics Oceanography Physical Geography and Environmental Geoscience Stevens, CL McPhee, MG Forrest, AL Leonard, GH Stanton, T Haskell, TG The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing |
topic_facet |
glacier tongue Antarctica ocean mixing blocking turbulence supercooling Geophysics Oceanography Physical Geography and Environmental Geoscience |
description |
In situ measurements of flow and stratification in the vicinity of the Erebus Glacier Tongue, a 12 km long floating Antarctic glacier, show the significant influence of the glacier. Three ADCPs (75, 300, and 600 kHz) were deployed close (<50 m) to the sidewall of the glacier in order to capture near-field flow distortion. Scalar (temperature and conductivity) and shear microstructure profiling captured small-scale vertical variability. Flow magnitudes exceeded 0.3 m s-1 through a combination of tidal flow (8 cm s-1) and a background/residual flow (4-10 cm s-1) flowing to the NW. Turbulence was dominated by deeper mixing during spring tide, likely indicative of the role of bathymetric variation which locally forms an obstacle as great as the glacier. During the neap tide, near-surface mixing was as energetic as that seen in the spring tide, suggesting the presence of buoyancy-driven near-surface flows. Estimates of integrated dissipation rate suggest that these floating extensions of the Antarctic ice sheet alter energy budgets through enhanced dissipation, and thus influence coastal near-surface circulation. Key Points A blocking layer is generated by the floating glacier Tidal rectification or substantial residual flow results in tidal asymmetry Upper water column mixing is at least as strong during neap tides as spring © 2014. American Geophysical Union. All Rights Reserved. |
format |
Article in Journal/Newspaper |
author |
Stevens, CL McPhee, MG Forrest, AL Leonard, GH Stanton, T Haskell, TG |
author_facet |
Stevens, CL McPhee, MG Forrest, AL Leonard, GH Stanton, T Haskell, TG |
author_sort |
Stevens, CL |
title |
The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing |
title_short |
The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing |
title_full |
The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing |
title_fullStr |
The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing |
title_full_unstemmed |
The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing |
title_sort |
influence of an antarctic glacier tongue on near-field ocean circulation and mixing |
publisher |
eScholarship, University of California |
publishDate |
2014 |
url |
https://escholarship.org/uc/item/8kk25604 |
op_coverage |
2344 - 2362 |
long_lat |
ENVELOPE(167.000,167.000,-77.683,-77.683) ENVELOPE(166.667,166.667,-77.700,-77.700) |
geographic |
Antarctic Erebus Glacier Erebus Glacier Tongue The Antarctic |
geographic_facet |
Antarctic Erebus Glacier Erebus Glacier Tongue The Antarctic |
genre |
Antarc* Antarctic Antarctica Erebus Glacier Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Erebus Glacier Ice Sheet |
op_source |
Journal of Geophysical Research: Oceans, vol 119, iss 4 |
op_relation |
qt8kk25604 https://escholarship.org/uc/item/8kk25604 |
op_rights |
public |
_version_ |
1766273432174985216 |