Eddies, islands, and mixing
Also published as Journal of Geophysical Research, 83(C6), 1978, pp. 2921–2938 As part of a field study of the relation between fine scale and large‐scale variations of water properties in the western North Atlantic, the waters in the vicinity of Bermuda were investigated in detail. Previous work in...
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Woods Hole Oceanographic Institution
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/10630 2023-05-15T17:35:22+02:00 Eddies, islands, and mixing Hogg, Nelson G. Katz, Eli J. Sanford, Thomas B. 1978-12 https://hdl.handle.net/1912/10630 en_US eng Woods Hole Oceanographic Institution WHOI Technical Reports WHOI-78-86 Hogg, N. G., Katz, E. J., & Sanford, T. B. (1978). Eddies, islands, and mixing. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10630 https://hdl.handle.net/1912/10630 doi:10.1575/1912/10630 Hogg, N. G., Katz, E. J., & Sanford, T. B. (1978). Eddies, islands, and mixing. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10630 doi:10.1575/1912/10630 Oceanic mixing Turbulence Ocean currents Technical Report 1978 ftwhoas https://doi.org/10.1575/1912/10630 2022-05-28T23:00:30Z Also published as Journal of Geophysical Research, 83(C6), 1978, pp. 2921–2938 As part of a field study of the relation between fine scale and large‐scale variations of water properties in the western North Atlantic, the waters in the vicinity of Bermuda were investigated in detail. Previous work in the area had revealed regions of intense temperature fine structure confined to the sides of the island. Generally quieter levels of activity elsewhere in the midocean have suggested that significant mixing might only occur at the solid and fluid boundaries of the ocean. During the course of our investigation, two Gulf Stream rings were found in the vicinity of the island. The exchange of water between them caused three regions of strong alongshore flow. In these three areas we find elevated levels of temperature fine structure in the upper 800 m as measured by the variance in the temperature gradient normalized by the square of the mean temperature gradient over the interval. The normalized temperature variances on small scales (0.2–1 m) are most energetic in patches tightly bound to the island sides, whereas the fine structure on larger scales (5–25 m) is also energetic away from the island in a region of outflow. Velocity profiles show that vertical scales shorten as one approaches the island, and the energy increases in the counterclockwise component. There is no correlation evident between the shear measurements of the internal wave field and the intensity of the fine structure. Possible mechanisms for the production of fine structure are explored within the context of these observations. This research was carried out with funding from the Office of Naval Research under contracts NOOOI4-74-C- 0262 NR083-004 (N .G.H. and T.B.S.) and the National Science Foundation under grant OCE74-19608 (E.J.K.). Report North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Woods Hole, MA |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Oceanic mixing Turbulence Ocean currents |
spellingShingle |
Oceanic mixing Turbulence Ocean currents Hogg, Nelson G. Katz, Eli J. Sanford, Thomas B. Eddies, islands, and mixing |
topic_facet |
Oceanic mixing Turbulence Ocean currents |
description |
Also published as Journal of Geophysical Research, 83(C6), 1978, pp. 2921–2938 As part of a field study of the relation between fine scale and large‐scale variations of water properties in the western North Atlantic, the waters in the vicinity of Bermuda were investigated in detail. Previous work in the area had revealed regions of intense temperature fine structure confined to the sides of the island. Generally quieter levels of activity elsewhere in the midocean have suggested that significant mixing might only occur at the solid and fluid boundaries of the ocean. During the course of our investigation, two Gulf Stream rings were found in the vicinity of the island. The exchange of water between them caused three regions of strong alongshore flow. In these three areas we find elevated levels of temperature fine structure in the upper 800 m as measured by the variance in the temperature gradient normalized by the square of the mean temperature gradient over the interval. The normalized temperature variances on small scales (0.2–1 m) are most energetic in patches tightly bound to the island sides, whereas the fine structure on larger scales (5–25 m) is also energetic away from the island in a region of outflow. Velocity profiles show that vertical scales shorten as one approaches the island, and the energy increases in the counterclockwise component. There is no correlation evident between the shear measurements of the internal wave field and the intensity of the fine structure. Possible mechanisms for the production of fine structure are explored within the context of these observations. This research was carried out with funding from the Office of Naval Research under contracts NOOOI4-74-C- 0262 NR083-004 (N .G.H. and T.B.S.) and the National Science Foundation under grant OCE74-19608 (E.J.K.). |
format |
Report |
author |
Hogg, Nelson G. Katz, Eli J. Sanford, Thomas B. |
author_facet |
Hogg, Nelson G. Katz, Eli J. Sanford, Thomas B. |
author_sort |
Hogg, Nelson G. |
title |
Eddies, islands, and mixing |
title_short |
Eddies, islands, and mixing |
title_full |
Eddies, islands, and mixing |
title_fullStr |
Eddies, islands, and mixing |
title_full_unstemmed |
Eddies, islands, and mixing |
title_sort |
eddies, islands, and mixing |
publisher |
Woods Hole Oceanographic Institution |
publishDate |
1978 |
url |
https://hdl.handle.net/1912/10630 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Hogg, N. G., Katz, E. J., & Sanford, T. B. (1978). Eddies, islands, and mixing. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10630 doi:10.1575/1912/10630 |
op_relation |
WHOI Technical Reports WHOI-78-86 Hogg, N. G., Katz, E. J., & Sanford, T. B. (1978). Eddies, islands, and mixing. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/10630 https://hdl.handle.net/1912/10630 doi:10.1575/1912/10630 |
op_doi |
https://doi.org/10.1575/1912/10630 |
op_publisher_place |
Woods Hole, MA |
_version_ |
1766134506124738560 |