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 |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Meteorological Society
2011
|
Subjects: | |
Online Access: | http://dro.dur.ac.uk/20955/ http://dro.dur.ac.uk/20955/1/20955.pdf https://doi.org/10.1175/JTECH-D-10-05012.1 |
id |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:20955 |
---|---|
record_format |
openpolar |
spelling |
ftunivdurham:oai:dro.dur.ac.uk.OAI2:20955 2023-05-15T14:02:14+02:00 Estimating geostrophic shear from seismic images of oceanic structure. Sheen, Katy L. White, Nicky Caulfield, Colm P. Hobbs, Richard W. 2011-09-01 application/pdf http://dro.dur.ac.uk/20955/ http://dro.dur.ac.uk/20955/1/20955.pdf https://doi.org/10.1175/JTECH-D-10-05012.1 unknown American Meteorological Society dro:20955 issn:0739-0572 issn: 1520-0426 doi:10.1175/JTECH-D-10-05012.1 http://dro.dur.ac.uk/20955/ https://doi.org/10.1175/JTECH-D-10-05012.1 http://dro.dur.ac.uk/20955/1/20955.pdf © 2011 American Meteorological Society Journal of atmospheric and oceanic technology, 2011, Vol.28(9), pp.1149-1154 [Peer Reviewed Journal] Article PeerReviewed 2011 ftunivdurham https://doi.org/10.1175/JTECH-D-10-05012.1 2020-05-28T22:36:45Z 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 Durham University: Durham Research Online 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 |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
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, Colm P. Hobbs, Richard W. |
spellingShingle |
Sheen, Katy L. White, Nicky Caulfield, Colm P. Hobbs, Richard W. Estimating geostrophic shear from seismic images of oceanic structure. |
author_facet |
Sheen, Katy L. White, Nicky Caulfield, Colm 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. |
publisher |
American Meteorological Society |
publishDate |
2011 |
url |
http://dro.dur.ac.uk/20955/ http://dro.dur.ac.uk/20955/1/20955.pdf https://doi.org/10.1175/JTECH-D-10-05012.1 |
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_source |
Journal of atmospheric and oceanic technology, 2011, Vol.28(9), pp.1149-1154 [Peer Reviewed Journal] |
op_relation |
dro:20955 issn:0739-0572 issn: 1520-0426 doi:10.1175/JTECH-D-10-05012.1 http://dro.dur.ac.uk/20955/ https://doi.org/10.1175/JTECH-D-10-05012.1 http://dro.dur.ac.uk/20955/1/20955.pdf |
op_rights |
© 2011 American Meteorological Society |
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_ |
1766272400037511168 |