---
_id: '9152'
abstract:
- lang: eng
text: Previous numerical studies of the dissipation of internal tides in idealized
settings suggest the existence of a critical latitude (~29°) where dissipation
is enhanced. But observations only indicate a modest enhancement at this latitude.
To resolve this difference between observational and numerical results, the authors
study the latitudinal dependence of internal tides’ dissipation in more realistic
conditions. In particular, the ocean is not a quiescent medium; the presence of
large-scale currents or mesoscale eddies can impact the propagation and dissipation
of internal tides. This paper investigates the impact of a weak background mean
current in numerical simulations. The authors focus on the local dissipation of
high spatial mode internal waves near their generation site. The vertical profile
of dissipation and its variation with latitude without the mean current are consistent
with earlier studies. But adding a weak mean current has a major impact on the
latitudinal distribution of dissipation. The peak at the critical latitude disappears,
and the dissipation is closer to a constant, albeit with two weak peaks at ~25°
and ~35° latitude. This disappearance results from the Doppler shift of the internal
tides’ frequency, which hinders the nonlinear transfer of energy to small-scale
secondary waves via the parametric subharmonic instability (PSI). The new two
weak peaks correspond to the Doppler-shifted critical latitudes of the left- and
right-propagating waves. The results are confirmed in simulations with simple
sinusoidal topography. Thus, although nonlinear transfers via PSI are efficient
at dissipating internal tides, the exact location of the dissipation is sensitive
to large-scale oceanic conditions.
article_processing_charge: No
article_type: original
author:
- first_name: O.
full_name: Richet, O.
last_name: Richet
- first_name: Caroline J
full_name: Muller, Caroline J
id: f978ccb0-3f7f-11eb-b193-b0e2bd13182b
last_name: Muller
orcid: 0000-0001-5836-5350
- first_name: J.-M.
full_name: Chomaz, J.-M.
last_name: Chomaz
citation:
ama: Richet O, Muller CJ, Chomaz J-M. Impact of a mean current on the internal tide
energy dissipation at the critical latitude. Journal of Physical Oceanography.
2017;47(6):1457-1472. doi:10.1175/jpo-d-16-0197.1
apa: Richet, O., Muller, C. J., & Chomaz, J.-M. (2017). Impact of a mean current
on the internal tide energy dissipation at the critical latitude. Journal of
Physical Oceanography. American Meteorological Society. https://doi.org/10.1175/jpo-d-16-0197.1
chicago: Richet, O., Caroline J Muller, and J.-M. Chomaz. “Impact of a Mean Current
on the Internal Tide Energy Dissipation at the Critical Latitude.” Journal
of Physical Oceanography. American Meteorological Society, 2017. https://doi.org/10.1175/jpo-d-16-0197.1.
ieee: O. Richet, C. J. Muller, and J.-M. Chomaz, “Impact of a mean current on the
internal tide energy dissipation at the critical latitude,” Journal of Physical
Oceanography, vol. 47, no. 6. American Meteorological Society, pp. 1457–1472,
2017.
ista: Richet O, Muller CJ, Chomaz J-M. 2017. Impact of a mean current on the internal
tide energy dissipation at the critical latitude. Journal of Physical Oceanography.
47(6), 1457–1472.
mla: Richet, O., et al. “Impact of a Mean Current on the Internal Tide Energy Dissipation
at the Critical Latitude.” Journal of Physical Oceanography, vol. 47, no.
6, American Meteorological Society, 2017, pp. 1457–72, doi:10.1175/jpo-d-16-0197.1.
short: O. Richet, C.J. Muller, J.-M. Chomaz, Journal of Physical Oceanography 47
(2017) 1457–1472.
date_created: 2021-02-15T15:11:04Z
date_published: 2017-06-01T00:00:00Z
date_updated: 2022-01-24T13:36:31Z
day: '01'
doi: 10.1175/jpo-d-16-0197.1
extern: '1'
intvolume: ' 47'
issue: '6'
keyword:
- Oceanography
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1175/JPO-D-16-0197.1
month: '06'
oa: 1
oa_version: Published Version
page: 1457-1472
publication: Journal of Physical Oceanography
publication_identifier:
issn:
- 0022-3670
- 1520-0485
publication_status: published
publisher: American Meteorological Society
quality_controlled: '1'
status: public
title: Impact of a mean current on the internal tide energy dissipation at the critical
latitude
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 47
year: '2017'
...
---
_id: '9147'
abstract:
- lang: eng
text: As part of an ongoing effort to develop a parameterization of wave-induced
abyssal mixing, the authors derive an heuristic model for nonlinear wave breaking
and energy dissipation associated with internal tides. Then the saturation and
dissipation of internal tides for idealized and observed topography samples are
investigated. One of the main results is that the wave-induced mixing could be
more intense and more confined to the bottom than previously assumed in numerical
models. Furthermore, in this model wave breaking and mixing clearly depend on
the small scales of the topography below 10 km or so, which is below the current
resolution of global bathymetry. This motivates the use of a statistical approach
to represent the unresolved topography when addressing the role of internal tides
in mixing the deep ocean.
article_processing_charge: No
article_type: original
author:
- first_name: Caroline J
full_name: Muller, Caroline J
id: f978ccb0-3f7f-11eb-b193-b0e2bd13182b
last_name: Muller
orcid: 0000-0001-5836-5350
- first_name: Oliver
full_name: Bühler, Oliver
last_name: Bühler
citation:
ama: Muller CJ, Bühler O. Saturation of the internal tides and induced mixing in
the abyssal ocean. Journal of Physical Oceanography. 2009;39(9):2077-2096.
doi:10.1175/2009jpo4141.1
apa: Muller, C. J., & Bühler, O. (2009). Saturation of the internal tides and
induced mixing in the abyssal ocean. Journal of Physical Oceanography.
American Meteorological Society. https://doi.org/10.1175/2009jpo4141.1
chicago: Muller, Caroline J, and Oliver Bühler. “Saturation of the Internal Tides
and Induced Mixing in the Abyssal Ocean.” Journal of Physical Oceanography.
American Meteorological Society, 2009. https://doi.org/10.1175/2009jpo4141.1.
ieee: C. J. Muller and O. Bühler, “Saturation of the internal tides and induced
mixing in the abyssal ocean,” Journal of Physical Oceanography, vol. 39,
no. 9. American Meteorological Society, pp. 2077–2096, 2009.
ista: Muller CJ, Bühler O. 2009. Saturation of the internal tides and induced mixing
in the abyssal ocean. Journal of Physical Oceanography. 39(9), 2077–2096.
mla: Muller, Caroline J., and Oliver Bühler. “Saturation of the Internal Tides and
Induced Mixing in the Abyssal Ocean.” Journal of Physical Oceanography,
vol. 39, no. 9, American Meteorological Society, 2009, pp. 2077–96, doi:10.1175/2009jpo4141.1.
short: C.J. Muller, O. Bühler, Journal of Physical Oceanography 39 (2009) 2077–2096.
date_created: 2021-02-15T14:41:08Z
date_published: 2009-09-01T00:00:00Z
date_updated: 2022-01-24T13:50:37Z
day: '01'
doi: 10.1175/2009jpo4141.1
extern: '1'
intvolume: ' 39'
issue: '9'
keyword:
- Oceanography
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1175/2009JPO4141.1
month: '09'
oa: 1
oa_version: Published Version
page: 2077-2096
publication: Journal of Physical Oceanography
publication_identifier:
issn:
- 1520-0485
- 0022-3670
publication_status: published
publisher: American Meteorological Society
quality_controlled: '1'
status: public
title: Saturation of the internal tides and induced mixing in the abyssal ocean
type: journal_article
user_id: 8b945eb4-e2f2-11eb-945a-df72226e66a9
volume: 39
year: '2009'
...