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| Titel |
A comparison between vertical motions measured by ADCP and inferred from temperature data |
| VerfasserIn |
H. Haren |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 4, no. 3 ; Nr. 4, no. 3 (2008-09-03), S.215-222 |
| Datensatznummer |
250001759
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| Publikation (Nr.) |
 copernicus.org/os-4-215-2008.pdf |
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| Zusammenfassung |
| Combined vertical current (w) and thermistor string data demonstrate that
high-, near-buoyancy frequency internal "wave" trains along a pycnocline in
a flat-bottom shelf sea consist for 2 periods of a dominant mode-1
non-linear part, while thereafter mainly of linear [mode-2, quadrupled
frequency] waves, to first order. In a simple [linear] heat budget the use
of unfiltered temperature gradient or its time mean changes results by only
10%. The observations also demonstrate that temperature is not always
adequate to estimate vertical motions using the linear 1-D heat equation. In
shallow seas, tidal-w estimated from temperature data can be an order of
magnitude weaker than directly observed w, and thus do not represent free
internal waves. In the ocean, not too far from the main internal wave
topography source, tidal motions represent linear waves and are well
described by temperature-inferred w. There however, temperature-inferred w
and directly observed w differ strongly near the buoyancy frequency, at
which w is dominated by non-linear waves, and near [sub]inertial
frequencies, at which w is dominated by eddies and gyroscopic waves. |
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