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Sensitivity studies of circulation and ocean-shelf exchange off northern Norway
Moseidjord, H.; Svendsen, H.; Slagstad, D. (1999). Sensitivity studies of circulation and ocean-shelf exchange off northern Norway. Sarsia 84: 191-198
In: Sarsia. University of Bergen. Universitetsforlaget: Bergen. ISSN 0036-4827; e-ISSN 1503-1128
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| Auteurs | | Top |
- Moseidjord, H.
- Svendsen, H.
- Slagstad, D.
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| Abstract |
Knowledge about the general circulation on the shelf off northern Norway on a sufficiently small scale to include the influence of the shelf topography has been achieved before, through field investigations. However, little is known about what controls the flow in this area on the small scale. The objective of this study was to find what possibly controls the flow, with special emphasis on shelf circulation and ocean-shelf exchange. Due to lack of sufficiently appropriate (small-scale, long-term) field data, an approach using a numerical model was adopted. Through model sensitivity experiments it was possible to study the effect of shelf topography and upwelling-favourable wind separately. Successful simula- tion of the general shelf circulation and vortex formations in agreement with field observations indicates that the model employed was performing realistically. There appears to be a strong correlation between the variation in the onshore flux in the Malangendypet trench and that in the along-shore wind component. The shelf topography seems to induce a complex wind-driven up-welling, with cross shelf trenches guiding the onshore flow. The shelf topography in combination with strong topographic steering appear to induce upwelling in areas where topographically steered currents leaving the shelf converge with the slope current. |
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