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| Titel |
Vertical structure of currents in the vicinity of the Iceland-Scotland Ridge |
| VerfasserIn |
C. Carollo, I. Astin, J. Graff |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 6 ; Nr. 23, no. 6 (2005-09-15), S.1963-1975 |
| Datensatznummer |
250015281
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1963-2005.pdf |
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| Zusammenfassung |
An analysis of current profiles carried out on moored Acoustic Doppler
Current Profiler data sets recorded during the Variability of Exchanges In
the Northern Seas project is presented here for several locations in three
sections in the vicinity of the Iceland-Scotland Ridge: (1) north of the
Faroes, (2) in the Faroe-Bank Channel and (3) in the Faroe-Shetland Channel.
Total currents have been decomposed into three components, namely the mean
residual flow, tide and surge. The mean residual flow is found to be
dominant. Results for the major tidal constituents (M2, S2,
N2, O1 and K1) are shown and discussed. It is found that the
predominant tidal harmonic M2 becomes steered through depth to align
with the bottom topography. The mean residual flow is found to be generally
larger than the surge, particularly in the Faroe-Bank Channel below 500m
depth where it is the dominant component. Here tidal rectification, i.e. the
topographic rectification of tidal currents originating in nonlinearities
that rectify the oscillatory tidal motion, is identified as the process
enhancing the large mean residual currents found. From the current structure,
two water masses are identified in the channel: the upper slowing moving
inflow water and the colder outflow water characterised by a 3–6-day
periodicity. In the Faroe-Shetland Channel the flow is characterised by large
tidal currents, particularly in shallow waters. Instead, north of the Faroes
none of the component was identified as dominant. The results show that the
variability of the current components is strongly dependent upon topography
and water depth.
Keywords. Oceanography: Physical (Currents; General
circulation; General or miscellaneous) |
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