Temperature and current fluctuations due to tidal advection of a front
van Haren, J.J.M.; Maas, L.R.M. (1987). Temperature and current fluctuations due to tidal advection of a front. Neth. J. Sea Res. 21(2): 79-94
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, more
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| Authors | | Top |
- van Haren, J.J.M.
- Maas, L.R.M.
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| Abstract |
Records of current meters and thermistor chains moored at four closely spaced positions in the stratified Central North Sea during the summer of 1982 were analysed for "fluctuating signals" in the semidiurnal tidal band. The fluctuating current signal was defined as the residual time series after subtraction of a hindcast harmonic series (identified as barotropic currents) from the original data. The fluctuating temperature signal resulted after substraction of the low-passed temperature field from the original data. During the period of interest a distinct frontal zone passed the moorings. Correlations and inspection of semidiurnal bandpass filtered graphs revealed no evidence for the existence of internal tides. Fluctuating temperature signals seemed to be caused mainly by rigid tidal advection of the frontal zone. The fluctuating current signals were partly caused by tidal advection of the geostrophic current, associated with the frontal zone, and partly by a phase shift in the barotropic current, due to stratification. |
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