Estimating Geostrophic Shear from Seismic Images of Oceanic Structure*
It is shown that geostrophic vertical shear estimates can be recovered from seismic (i.e., acoustic) images of thermohaline structure. In the Southern Ocean, the Antarctic Circumpolar Current forms a loop within the Falkland Trough before it flows northward into the Argentine Basin. Seismic profiles...
Published in: | Journal of Atmospheric and Oceanic Technology |
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2011
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ftsouthampton:oai:eprints.soton.ac.uk:201407 2023-07-30T03:58:02+02:00 Estimating Geostrophic Shear from Seismic Images of Oceanic Structure* Sheen, Katy L. White, Nicky Caulfield, C.P. Hobbs, Richard W. 2011-09 https://eprints.soton.ac.uk/201407/ unknown Sheen, Katy L., White, Nicky, Caulfield, C.P. and Hobbs, Richard W. (2011) Estimating Geostrophic Shear from Seismic Images of Oceanic Structure*. Journal of Atmospheric and Oceanic Technology, 28 (9), 1149-1154. (doi:10.1175/JTECH-D-10-05012.1 <http://dx.doi.org/10.1175/JTECH-D-10-05012.1>). Article PeerReviewed 2011 ftsouthampton https://doi.org/10.1175/JTECH-D-10-05012.1 2023-07-09T21:24:11Z It is shown that geostrophic vertical shear estimates can be recovered from seismic (i.e., acoustic) images of thermohaline structure. In the Southern Ocean, the Antarctic Circumpolar Current forms a loop within the Falkland Trough before it flows northward into the Argentine Basin. Seismic profiles that cross this loop show the detailed structure of different water masses with a horizontal resolution of O(10 m). Coherent seismic reflections are tilted in response to current flow around the Falkland Trough. Average slopes were measured on length scales that are large enough to ensure that the geostrophic approximation is valid (i.e., with a Rossby number <0.1). By combining shear estimates with satellite altimetric measurements and acoustic Doppler current profiles, geostrophic velocities can be calculated throughout the data volume. This technique for estimating geostrophic vertical shear from legacy seismic images yields useful information about the spatial and temporal variation of mesoscale circulation. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean University of Southampton: e-Prints Soton Antarctic Argentine Falkland Trough ENVELOPE(-49.750,-49.750,-52.750,-52.750) Southern Ocean The Antarctic Journal of Atmospheric and Oceanic Technology 28 9 1149 1154 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
unknown |
description |
It is shown that geostrophic vertical shear estimates can be recovered from seismic (i.e., acoustic) images of thermohaline structure. In the Southern Ocean, the Antarctic Circumpolar Current forms a loop within the Falkland Trough before it flows northward into the Argentine Basin. Seismic profiles that cross this loop show the detailed structure of different water masses with a horizontal resolution of O(10 m). Coherent seismic reflections are tilted in response to current flow around the Falkland Trough. Average slopes were measured on length scales that are large enough to ensure that the geostrophic approximation is valid (i.e., with a Rossby number <0.1). By combining shear estimates with satellite altimetric measurements and acoustic Doppler current profiles, geostrophic velocities can be calculated throughout the data volume. This technique for estimating geostrophic vertical shear from legacy seismic images yields useful information about the spatial and temporal variation of mesoscale circulation. |
format |
Article in Journal/Newspaper |
author |
Sheen, Katy L. White, Nicky Caulfield, C.P. Hobbs, Richard W. |
spellingShingle |
Sheen, Katy L. White, Nicky Caulfield, C.P. Hobbs, Richard W. Estimating Geostrophic Shear from Seismic Images of Oceanic Structure* |
author_facet |
Sheen, Katy L. White, Nicky Caulfield, C.P. Hobbs, Richard W. |
author_sort |
Sheen, Katy L. |
title |
Estimating Geostrophic Shear from Seismic Images of Oceanic Structure* |
title_short |
Estimating Geostrophic Shear from Seismic Images of Oceanic Structure* |
title_full |
Estimating Geostrophic Shear from Seismic Images of Oceanic Structure* |
title_fullStr |
Estimating Geostrophic Shear from Seismic Images of Oceanic Structure* |
title_full_unstemmed |
Estimating Geostrophic Shear from Seismic Images of Oceanic Structure* |
title_sort |
estimating geostrophic shear from seismic images of oceanic structure* |
publishDate |
2011 |
url |
https://eprints.soton.ac.uk/201407/ |
long_lat |
ENVELOPE(-49.750,-49.750,-52.750,-52.750) |
geographic |
Antarctic Argentine Falkland Trough Southern Ocean The Antarctic |
geographic_facet |
Antarctic Argentine Falkland Trough Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
Sheen, Katy L., White, Nicky, Caulfield, C.P. and Hobbs, Richard W. (2011) Estimating Geostrophic Shear from Seismic Images of Oceanic Structure*. Journal of Atmospheric and Oceanic Technology, 28 (9), 1149-1154. (doi:10.1175/JTECH-D-10-05012.1 <http://dx.doi.org/10.1175/JTECH-D-10-05012.1>). |
op_doi |
https://doi.org/10.1175/JTECH-D-10-05012.1 |
container_title |
Journal of Atmospheric and Oceanic Technology |
container_volume |
28 |
container_issue |
9 |
container_start_page |
1149 |
op_container_end_page |
1154 |
_version_ |
1772820962204450816 |