Convective and shear-induced turbulence in the deep Kane Gap
International audience The boundary layer above a 4569 m deep slope in the near-equatorial N-Atlantic Ocean Kane Gap, a through-flow for Antarctic Bottom Water (AABW), is characterized by two distinct turbulent regimes that differ by an order of magnitude in intensity depending on the direction of t...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2013
|
Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-00880518 https://hal.archives-ouvertes.fr/hal-00880518/document https://hal.archives-ouvertes.fr/hal-00880518/file/VANHAREN_JGR_2013.pdf https://doi.org/10.1002/2013JC009282 |
id |
ftccsdartic:oai:HAL:hal-00880518v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-00880518v1 2023-05-15T14:03:23+02:00 Convective and shear-induced turbulence in the deep Kane Gap Van Haren, H. Morozov, E. Gostiaux, Louis Tarakanov, Roman Royal Netherlands Institute for Sea Research (NIOZ) P.P. Shirshov Institute of Oceanology (SIO) Russian Academy of Sciences Moscow (RAS) Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA) École Centrale de Lyon (ECL) Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal.archives-ouvertes.fr/hal-00880518 https://hal.archives-ouvertes.fr/hal-00880518/document https://hal.archives-ouvertes.fr/hal-00880518/file/VANHAREN_JGR_2013.pdf https://doi.org/10.1002/2013JC009282 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JC009282 hal-00880518 https://hal.archives-ouvertes.fr/hal-00880518 https://hal.archives-ouvertes.fr/hal-00880518/document https://hal.archives-ouvertes.fr/hal-00880518/file/VANHAREN_JGR_2013.pdf doi:10.1002/2013JC009282 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-00880518 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2013, 118 (11), pp.5924-5930. ⟨10.1002/2013JC009282⟩ [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.1002/2013JC009282 2021-11-28T01:11:14Z International audience The boundary layer above a 4569 m deep slope in the near-equatorial N-Atlantic Ocean Kane Gap, a through-flow for Antarctic Bottom Water (AABW), is characterized by two distinct turbulent regimes that differ by an order of magnitude in intensity depending on the direction of through-flow. During south- and downward flow, vertical mixing is vigorous (resulting for a representative case-study in two-day mean and 6-132 m above the bottom averaged dissipation rate of ε = 2.1±1×10-9 W kg-1 and eddy diffusivity of Kz = 7±4×10-4 m2 s-1). The mixing is across relatively large vertical overturns. During north- and upward flow, smaller overturns are more horizontal as in stratified shear flow (with representative two-day mean ε = 6±3×10-11 W kg-1, Kz = 4±2×10-5 m2 s-1). Stratification is approximately the same during both flow-directions. Although the different turbulence regimes are partially associated with frictional boundary layers of large-scale flows above sloping topography, but not with those over flat bottoms, and partially with flow across a hill-promontory, internal waves are a dominant process in promoting turbulence. In addition, internal waves are observed to push stratification towards the bottom thereby importantly contributing to the mixing of AABW. Article in Journal/Newspaper Antarc* Antarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Kane ENVELOPE(-63.038,-63.038,-73.952,-73.952) Journal of Geophysical Research: Oceans 118 11 5924 5930 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Van Haren, H. Morozov, E. Gostiaux, Louis Tarakanov, Roman Convective and shear-induced turbulence in the deep Kane Gap |
topic_facet |
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience The boundary layer above a 4569 m deep slope in the near-equatorial N-Atlantic Ocean Kane Gap, a through-flow for Antarctic Bottom Water (AABW), is characterized by two distinct turbulent regimes that differ by an order of magnitude in intensity depending on the direction of through-flow. During south- and downward flow, vertical mixing is vigorous (resulting for a representative case-study in two-day mean and 6-132 m above the bottom averaged dissipation rate of ε = 2.1±1×10-9 W kg-1 and eddy diffusivity of Kz = 7±4×10-4 m2 s-1). The mixing is across relatively large vertical overturns. During north- and upward flow, smaller overturns are more horizontal as in stratified shear flow (with representative two-day mean ε = 6±3×10-11 W kg-1, Kz = 4±2×10-5 m2 s-1). Stratification is approximately the same during both flow-directions. Although the different turbulence regimes are partially associated with frictional boundary layers of large-scale flows above sloping topography, but not with those over flat bottoms, and partially with flow across a hill-promontory, internal waves are a dominant process in promoting turbulence. In addition, internal waves are observed to push stratification towards the bottom thereby importantly contributing to the mixing of AABW. |
author2 |
Royal Netherlands Institute for Sea Research (NIOZ) P.P. Shirshov Institute of Oceanology (SIO) Russian Academy of Sciences Moscow (RAS) Laboratoire de Mecanique des Fluides et d'Acoustique (LMFA) École Centrale de Lyon (ECL) Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL) Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon) Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Van Haren, H. Morozov, E. Gostiaux, Louis Tarakanov, Roman |
author_facet |
Van Haren, H. Morozov, E. Gostiaux, Louis Tarakanov, Roman |
author_sort |
Van Haren, H. |
title |
Convective and shear-induced turbulence in the deep Kane Gap |
title_short |
Convective and shear-induced turbulence in the deep Kane Gap |
title_full |
Convective and shear-induced turbulence in the deep Kane Gap |
title_fullStr |
Convective and shear-induced turbulence in the deep Kane Gap |
title_full_unstemmed |
Convective and shear-induced turbulence in the deep Kane Gap |
title_sort |
convective and shear-induced turbulence in the deep kane gap |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.archives-ouvertes.fr/hal-00880518 https://hal.archives-ouvertes.fr/hal-00880518/document https://hal.archives-ouvertes.fr/hal-00880518/file/VANHAREN_JGR_2013.pdf https://doi.org/10.1002/2013JC009282 |
long_lat |
ENVELOPE(-63.038,-63.038,-73.952,-73.952) |
geographic |
Antarctic Kane |
geographic_facet |
Antarctic Kane |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.archives-ouvertes.fr/hal-00880518 Journal of Geophysical Research. Oceans, Wiley-Blackwell, 2013, 118 (11), pp.5924-5930. ⟨10.1002/2013JC009282⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JC009282 hal-00880518 https://hal.archives-ouvertes.fr/hal-00880518 https://hal.archives-ouvertes.fr/hal-00880518/document https://hal.archives-ouvertes.fr/hal-00880518/file/VANHAREN_JGR_2013.pdf doi:10.1002/2013JC009282 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1002/2013JC009282 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
11 |
container_start_page |
5924 |
op_container_end_page |
5930 |
_version_ |
1766274023452311552 |