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Estimating geostrophic shear from seismic images of oceanic structure.

Sheen, Katy L. and White, Nicky and Caulfield, Colm P. and Hobbs, Richard W. (2011) 'Estimating geostrophic shear from seismic images of oceanic structure.', Journal of atmospheric and oceanic technology., 28 (9). pp. 1149-1154.


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.

Item Type:Article
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Publisher statement:© 2011 American Meteorological Society
Date accepted:No date available
Date deposited:17 February 2017
Date of first online publication:01 September 2011
Date first made open access:No date available

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