Tidally induced internal motion in an Arctic fjord
The internal response in a stratified, partially enclosed basin subject to semi-diurnal tidal forcing through a narrow entrance is investigated. The site is located above the critical latitude where linear internal waves of lunar semi-diurnal frequency are not permitted to propagate freely. Generati...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-01-01
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| Series: | Nonlinear Processes in Geophysics |
| Online Access: | http://www.nonlin-processes-geophys.net/21/87/2014/npg-21-87-2014.pdf |
| _version_ | 1818479967750586368 |
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| author | E. Støylen I. Fer |
| author_facet | E. Støylen I. Fer |
| author_sort | E. Støylen |
| collection | DOAJ |
| description | The internal response in a stratified, partially enclosed basin subject to
semi-diurnal tidal forcing through a narrow entrance is investigated. The
site is located above the critical latitude where linear internal waves of
lunar semi-diurnal frequency are not permitted to propagate freely.
Generation and propagation of tidally induced internal Kelvin waves are
studied, for baroclinically sub- and supercritical conditions at the mouth of
the fjord, using a non-linear 3-D numerical model in an idealized basin and
in Van Mijenfjorden, Svalbard, using a realistic topography. The model
results are compared to observations of hydrography and currents made in
August 2010. Results from both the model and measurements indicate the
presence of internal Kelvin waves, even when conditions at the fjord entrance
are supercritical. The entrance of Van Mijenfjorden is split into two sounds.
Sensitivity experiments by closing each sound separately reveal that internal
Kelvin waves are generated at both sounds. When the conditions are near
supercritical, a wave pulse propagates inward from the fjord entrance at the
beginning of each inflow phase of the tidal cycle. The leading crest is
followed by a series of smaller amplitude waves characterized as non-linear
internal solitons. However, higher model resolution is needed to accurately
describe the influence of small-scale mixing and processes near the sill
crest in establishing the evolution of the flow and internal response in the
fjord. |
| first_indexed | 2024-12-10T11:16:59Z |
| format | Article |
| id | doaj.art-83e0747e815d45568a8c43de8608c67c |
| institution | Directory Open Access Journal |
| issn | 1023-5809 1607-7946 |
| language | English |
| last_indexed | 2024-12-10T11:16:59Z |
| publishDate | 2014-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Nonlinear Processes in Geophysics |
| spelling | doaj.art-83e0747e815d45568a8c43de8608c67c2022-12-22T01:51:08ZengCopernicus PublicationsNonlinear Processes in Geophysics1023-58091607-79462014-01-012118710010.5194/npg-21-87-2014Tidally induced internal motion in an Arctic fjordE. Støylen0I. Fer1Department of Geosciences, University of Oslo, Oslo, NorwayGeophysical Institute, University of Bergen, Bergen, NorwayThe internal response in a stratified, partially enclosed basin subject to semi-diurnal tidal forcing through a narrow entrance is investigated. The site is located above the critical latitude where linear internal waves of lunar semi-diurnal frequency are not permitted to propagate freely. Generation and propagation of tidally induced internal Kelvin waves are studied, for baroclinically sub- and supercritical conditions at the mouth of the fjord, using a non-linear 3-D numerical model in an idealized basin and in Van Mijenfjorden, Svalbard, using a realistic topography. The model results are compared to observations of hydrography and currents made in August 2010. Results from both the model and measurements indicate the presence of internal Kelvin waves, even when conditions at the fjord entrance are supercritical. The entrance of Van Mijenfjorden is split into two sounds. Sensitivity experiments by closing each sound separately reveal that internal Kelvin waves are generated at both sounds. When the conditions are near supercritical, a wave pulse propagates inward from the fjord entrance at the beginning of each inflow phase of the tidal cycle. The leading crest is followed by a series of smaller amplitude waves characterized as non-linear internal solitons. However, higher model resolution is needed to accurately describe the influence of small-scale mixing and processes near the sill crest in establishing the evolution of the flow and internal response in the fjord.http://www.nonlin-processes-geophys.net/21/87/2014/npg-21-87-2014.pdf |
| spellingShingle | E. Støylen I. Fer Tidally induced internal motion in an Arctic fjord Nonlinear Processes in Geophysics |
| title | Tidally induced internal motion in an Arctic fjord |
| title_full | Tidally induced internal motion in an Arctic fjord |
| title_fullStr | Tidally induced internal motion in an Arctic fjord |
| title_full_unstemmed | Tidally induced internal motion in an Arctic fjord |
| title_short | Tidally induced internal motion in an Arctic fjord |
| title_sort | tidally induced internal motion in an arctic fjord |
| url | http://www.nonlin-processes-geophys.net/21/87/2014/npg-21-87-2014.pdf |
| work_keys_str_mv | AT estøylen tidallyinducedinternalmotioninanarcticfjord AT ifer tidallyinducedinternalmotioninanarcticfjord |