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| Titel |
A review of the role of submarine canyons in deep-ocean exchange with the shelf |
| VerfasserIn |
S. E. Allen, X. Durrieu de Madron |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2009-12-07), S.607-620 |
| Datensatznummer |
250002735
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| Publikation (Nr.) |
 copernicus.org/os-5-607-2009.pdf |
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| Zusammenfassung |
| Cross shelf-break exchange is limited by the tendency of geostrophic flow to
follow bathymetric contours, not cross them. However, small scale topography,
such as canyons, can reduce the local lengthscale of the flow and increase
the local Rossby number. These higher Rossby numbers mean the flow is no
longer purely geostrophic and significant cross-isobath flow can occur. This
cross-isobath flow includes both upwelling and downwelling due to wind-driven
shelf currents and the strong cascading flows of dense shelf-water into the
ocean. Tidal currents usually run primarily parallel to the shelf-break
topography. Canyons cut across these flows and thus are often regions of
generation of strong baroclinic tides and internal waves. Canyons can also
focus internal waves. Both processes lead to greatly elevated levels of
mixing. Thus, through both advection and mixing processes, canyons can
enhance Deep Ocean Shelf Exchange. Here we review the state of the science
describing the dynamics of the flows and suggest further areas of research,
particularly into quantifying fluxes of nutrients and carbon as well as heat
and salt through canyons. |
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