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| Titel |
Flow and mixing near a glacier tongue: a pilot study |
| VerfasserIn |
C. L. Stevens, C. L. Stewart, N. J. Robinson, M. J. M. Williams, T. G. Haskell |
| 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 ; 7, no. 3 ; Nr. 7, no. 3 (2011-05-06), S.293-304 |
| Datensatznummer |
250004643
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| Publikation (Nr.) |
 copernicus.org/os-7-293-2011.pdf |
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| Zusammenfassung |
| A glacier tongue floating in the coastal ocean presents a significant
obstacle to the local flow and so influences oceanic mixing and transport
processes. Here acoustic Doppler current profiler and shear microstructure
observations very near to a glacier tongue side-wall capture flow
accelerations and associated mixing. Flow speeds reached around 40 cm s−1, twice that of the ambient tidal flow amplitude, and generated
vertical velocity shear squared as large as 10−5 s−2. During the
time of maximum flow, turbulent energy dissipation rates reached 10−5 m2 s−3, around three decades greater than local background levels.
This is in keeping with estimates of the gradient Richardson Number which
dropped to ~1 during maximum flow. Associated vertical diffusivities
estimated from the shear microstructure results were substantial, reflecting
the influence of the glacier on velocity gradients. |
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