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Observations of small-scale processes associated with the internal tide encountering an island

Observations of small-scale processes associated with the internal tide encountering an island
Observations of small-scale processes associated with the internal tide encountering an island
Current-meter, temperature, and microstructure observations of the large-amplitude internal tide shoaling on the continental shelf of the east coast of northern New Zealand show the complexity of the internal kinematics and mixing. The propagation speed of the main internal wave was around 0.3 m s?1, and nonstationary time series analysis was used to locate the trailing short-wavelength internal waves in frequency (periods of around 40 min) and tidal-phase space. The average energy dissipation rate (5 × 10?8 m2 s?3) was an order of magnitude smaller than that observed on the open shelf in other studies, but peaks in dissipation rate were measured to be much greater. The vertical diffusivity of heat was around 10?4 m2 s?1, comparable to, or greater than, other studies. Examples of the scale and sporadic nature of larger mixing events were observed. The behavior was complicated by the nearby steeply shoaling coast of the Poor Knight Islands. Consistent reflected wave energy was not apparent.
0022-3670
1553-1567
Stevens, C.L.
041c9ee8-9942-4554-9e7f-d3788d60b007
Abraham, E.R.
20e2a30b-90b9-4614-ac5b-d4cbc9021b5e
Moore, C.M.
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Boyd, P.W.
1bac0dba-780e-4c14-93e0-4f707061532d
Sharples, J.
ec7edc0d-5f09-4b12-a832-0c7bf6a4b3ff
Stevens, C.L.
041c9ee8-9942-4554-9e7f-d3788d60b007
Abraham, E.R.
20e2a30b-90b9-4614-ac5b-d4cbc9021b5e
Moore, C.M.
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Boyd, P.W.
1bac0dba-780e-4c14-93e0-4f707061532d
Sharples, J.
ec7edc0d-5f09-4b12-a832-0c7bf6a4b3ff

Stevens, C.L., Abraham, E.R., Moore, C.M., Boyd, P.W. and Sharples, J. (2005) Observations of small-scale processes associated with the internal tide encountering an island. Journal of Physical Oceanography, 35 (9), 1553-1567. (doi:10.1175/JPO2754.1).

Record type: Article

Abstract

Current-meter, temperature, and microstructure observations of the large-amplitude internal tide shoaling on the continental shelf of the east coast of northern New Zealand show the complexity of the internal kinematics and mixing. The propagation speed of the main internal wave was around 0.3 m s?1, and nonstationary time series analysis was used to locate the trailing short-wavelength internal waves in frequency (periods of around 40 min) and tidal-phase space. The average energy dissipation rate (5 × 10?8 m2 s?3) was an order of magnitude smaller than that observed on the open shelf in other studies, but peaks in dissipation rate were measured to be much greater. The vertical diffusivity of heat was around 10?4 m2 s?1, comparable to, or greater than, other studies. Examples of the scale and sporadic nature of larger mixing events were observed. The behavior was complicated by the nearby steeply shoaling coast of the Poor Knight Islands. Consistent reflected wave energy was not apparent.

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Published date: 2005

Identifiers

Local EPrints ID: 17749
URI: https://eprints.soton.ac.uk/id/eprint/17749
ISSN: 0022-3670
PURE UUID: 4061d1fb-f008-4c95-8391-b185eecab4de

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Date deposited: 24 Oct 2005
Last modified: 17 Jul 2017 16:37

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