Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography
Simultaneous full-depth microstructure measurements of turbulence and finestructure measurements of velocity and density are analyzed to investigate the relationship between turbulence and the internal wave field in the Antarctic Circumpolar Current. These data reveal a systematic near-bottom overpr...
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ftsouthampton:oai:eprints.soton.ac.uk:342462 2023-08-27T04:04:34+02:00 Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography Waterman, Stephanie Polzin, Kyrt K, Naveira Garabato, Alberto C. Sheen, Katy L. Forryan, Alexander 2014-05 text https://eprints.soton.ac.uk/342462/ https://eprints.soton.ac.uk/342462/1/jpo-d-12-0154%25252E1.pdf en eng https://eprints.soton.ac.uk/342462/1/jpo-d-12-0154%25252E1.pdf Waterman, Stephanie, Polzin, Kyrt K,, Naveira Garabato, Alberto C., Sheen, Katy L. and Forryan, Alexander (2014) Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography. Journal of Physical Oceanography, 44 (5), 1466-1492. (doi:10.1175/JPO-D-12-0154.1 <http://dx.doi.org/10.1175/JPO-D-12-0154.1>). Article PeerReviewed 2014 ftsouthampton https://doi.org/10.1175/JPO-D-12-0154.1 2023-08-03T22:20:03Z Simultaneous full-depth microstructure measurements of turbulence and finestructure measurements of velocity and density are analyzed to investigate the relationship between turbulence and the internal wave field in the Antarctic Circumpolar Current. These data reveal a systematic near-bottom overprediction of the turbulent kinetic energy dissipation rate by finescale parameterization methods in select locations. Sites of near-bottom overprediction are typically characterized by large near-bottom flow speeds and elevated topographic roughness. Further, lower-than-average shear-to-strain ratios indicative of a less near-inertial wave field, rotary spectra suggesting a predominance of upward internal wave energy propagation, and enhanced narrowband variance at vertical wavelengths on the order of 100 m are found at these locations. Finally, finescale overprediction is typically associated with elevated Froude numbers based on the near-bottom shear of the background flow, and a background flow with a systematic backing tendency. Agreement of microstructure- and finestructure-based estimates within the expected uncertainty of the parameterization away from these special sites, the reproducibility of the overprediction signal across various parameterization implementations, and an absence of indications of atypical instrument noise at sites of parameterization overprediction, all suggest that physics not encapsulated by the parameterization play a role in the fate of bottom-generated waves at these locations. Several plausible underpinning mechanisms based on the limited available evidence are discussed that offer guidance for future studies Article in Journal/Newspaper Antarc* Antarctic University of Southampton: e-Prints Soton Antarctic The Antarctic Journal of Physical Oceanography 44 5 1466 1492 |
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Open Polar |
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University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
Simultaneous full-depth microstructure measurements of turbulence and finestructure measurements of velocity and density are analyzed to investigate the relationship between turbulence and the internal wave field in the Antarctic Circumpolar Current. These data reveal a systematic near-bottom overprediction of the turbulent kinetic energy dissipation rate by finescale parameterization methods in select locations. Sites of near-bottom overprediction are typically characterized by large near-bottom flow speeds and elevated topographic roughness. Further, lower-than-average shear-to-strain ratios indicative of a less near-inertial wave field, rotary spectra suggesting a predominance of upward internal wave energy propagation, and enhanced narrowband variance at vertical wavelengths on the order of 100 m are found at these locations. Finally, finescale overprediction is typically associated with elevated Froude numbers based on the near-bottom shear of the background flow, and a background flow with a systematic backing tendency. Agreement of microstructure- and finestructure-based estimates within the expected uncertainty of the parameterization away from these special sites, the reproducibility of the overprediction signal across various parameterization implementations, and an absence of indications of atypical instrument noise at sites of parameterization overprediction, all suggest that physics not encapsulated by the parameterization play a role in the fate of bottom-generated waves at these locations. Several plausible underpinning mechanisms based on the limited available evidence are discussed that offer guidance for future studies |
format |
Article in Journal/Newspaper |
author |
Waterman, Stephanie Polzin, Kyrt K, Naveira Garabato, Alberto C. Sheen, Katy L. Forryan, Alexander |
spellingShingle |
Waterman, Stephanie Polzin, Kyrt K, Naveira Garabato, Alberto C. Sheen, Katy L. Forryan, Alexander Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography |
author_facet |
Waterman, Stephanie Polzin, Kyrt K, Naveira Garabato, Alberto C. Sheen, Katy L. Forryan, Alexander |
author_sort |
Waterman, Stephanie |
title |
Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography |
title_short |
Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography |
title_full |
Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography |
title_fullStr |
Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography |
title_full_unstemmed |
Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography |
title_sort |
suppression of internal wave breaking in the antarctic circumpolar current near topography |
publishDate |
2014 |
url |
https://eprints.soton.ac.uk/342462/ https://eprints.soton.ac.uk/342462/1/jpo-d-12-0154%25252E1.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://eprints.soton.ac.uk/342462/1/jpo-d-12-0154%25252E1.pdf Waterman, Stephanie, Polzin, Kyrt K,, Naveira Garabato, Alberto C., Sheen, Katy L. and Forryan, Alexander (2014) Suppression of Internal Wave Breaking in the Antarctic Circumpolar Current near Topography. Journal of Physical Oceanography, 44 (5), 1466-1492. (doi:10.1175/JPO-D-12-0154.1 <http://dx.doi.org/10.1175/JPO-D-12-0154.1>). |
op_doi |
https://doi.org/10.1175/JPO-D-12-0154.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
44 |
container_issue |
5 |
container_start_page |
1466 |
op_container_end_page |
1492 |
_version_ |
1775352100507615232 |